Repository: numaproj/numaflow
Pull request #517 (2023-01-30 20:14:33)

feat: add buildin filter and event time extractor for source transformer
Signed-off-by: Keran Yang <yangkr920208@gmail.com>

Explain what this PR does.

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Patch:
diff --git a/api/json-schema/schema.json b/api/json-schema/schema.json
index a2716955..1cf3c9bd 100644
--- a/api/json-schema/schema.json
+++ b/api/json-schema/schema.json
@@ -18876,6 +18876,29 @@
       },
       "type": "object"
     },
+    "io.numaproj.numaflow.v1alpha1.Transformer": {
+      "properties": {
+        "args": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "kwargs": {
+          "additionalProperties": {
+            "type": "string"
+          },
+          "type": "object"
+        },
+        "name": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "name"
+      ],
+      "type": "object"
+    },
     "io.numaproj.numaflow.v1alpha1.UDF": {
       "properties": {
         "builtin": {
@@ -18903,13 +18926,13 @@
     },
     "io.numaproj.numaflow.v1alpha1.UDTransformer": {
       "properties": {
+        "builtin": {
+          "$ref": "#/definitions/io.numaproj.numaflow.v1alpha1.Transformer"
+        },
         "container": {
           "$ref": "#/definitions/io.numaproj.numaflow.v1alpha1.Container"
         }
       },
-      "required": [
-        "container"
-      ],
       "type": "object"
     },
     "io.numaproj.numaflow.v1alpha1.Vertex": {
diff --git a/api/openapi-spec/swagger.json b/api/openapi-spec/swagger.json
index b04dc803..1e604cab 100644
--- a/api/openapi-spec/swagger.json
+++ b/api/openapi-spec/swagger.json
@@ -18862,6 +18862,29 @@
         }
       }
     },
+    "io.numaproj.numaflow.v1alpha1.Transformer": {
+      "type": "object",
+      "required": [
+        "name"
+      ],
+      "properties": {
+        "args": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "kwargs": {
+          "type": "object",
+          "additionalProperties": {
+            "type": "string"
+          }
+        },
+        "name": {
+          "type": "string"
+        }
+      }
+    },
     "io.numaproj.numaflow.v1alpha1.UDF": {
       "type": "object",
       "properties": {
@@ -18889,10 +18912,10 @@
     },
     "io.numaproj.numaflow.v1alpha1.UDTransformer": {
       "type": "object",
-      "required": [
-        "container"
-      ],
       "properties": {
+        "builtin": {
+          "$ref": "#/definitions/io.numaproj.numaflow.v1alpha1.Transformer"
+        },
         "container": {
           "$ref": "#/definitions/io.numaproj.numaflow.v1alpha1.Container"
         }
diff --git a/cmd/commands/builtin_tranformers.go b/cmd/commands/builtin_tranformers.go
new file mode 100644
index 00000000..fce02887
--- /dev/null
+++ b/cmd/commands/builtin_tranformers.go
@@ -0,0 +1,77 @@
+/*
+Copyright 2022 The Numaproj Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package commands
+
+import (
+	"encoding/base64"
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/controller-runtime/pkg/manager/signals"
+
+	"github.com/numaproj/numaflow/pkg/shared/logging"
+	"github.com/numaproj/numaflow/pkg/sources/transformer/builtin"
+)
+
+func NewBuiltinTransformerCommand() *cobra.Command {
+	var (
+		name      string
+		cmdArgs   []string
+		cmdKWArgs map[string]string
+	)
+
+	command := &cobra.Command{
+		Use:   "builtin-transformer",
+		Short: "Starts builtin transformers",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if len(name) == 0 {
+				cmd.HelpFunc()(cmd, args)
+				return fmt.Errorf("transformer name missing, use '--name to specify a builtin transformer")
+			}
+			var decodedArgs []string
+			for _, arg := range cmdArgs {
+				decodeArg, err := base64.StdEncoding.DecodeString(arg)
+				if err != nil {
+					return err
+				}
+				decodedArgs = append(decodedArgs, string(decodeArg))
+			}
+			decodedKWArgs := make(map[string]string, len(cmdKWArgs))
+
+			for k, v := range cmdKWArgs {
+				decodeArg, err := base64.StdEncoding.DecodeString(v)
+				if err != nil {
+					return err
+				}
+				decodedKWArgs[k] = string(decodeArg)
+			}
+
+			b := &builtin.Builtin{
+				Name:   name,
+				Args:   decodedArgs,
+				KWArgs: decodedKWArgs,
+			}
+			log := logging.NewLogger().Named("builtin-transformer")
+			return b.Start(logging.WithLogger(signals.SetupSignalHandler(), log))
+		},
+	}
+	command.Flags().StringVarP(&name, "name", "n", "", "transformer name")
+	command.Flags().StringSliceVarP(&cmdArgs, "args", "a", []string{}, "transformer args")                   // --args=xxa,xxb --args=xxc
+	command.Flags().StringToStringVarP(&cmdKWArgs, "kwargs", "k", map[string]string{}, "transformer kwargs") // --kwargs=a=b,c=d
+
+	return command
+}
diff --git a/cmd/commands/builtin_udfs.go b/cmd/commands/builtin_udfs.go
index 247b1c85..2909469e 100644
--- a/cmd/commands/builtin_udfs.go
+++ b/cmd/commands/builtin_udfs.go
@@ -20,10 +20,11 @@ import (
 	"encoding/base64"
 	"fmt"
 
-	"github.com/numaproj/numaflow/pkg/shared/logging"
-	"github.com/numaproj/numaflow/pkg/udf/builtin"
 	"github.com/spf13/cobra"
 	"sigs.k8s.io/controller-runtime/pkg/manager/signals"
+
+	"github.com/numaproj/numaflow/pkg/shared/logging"
+	"github.com/numaproj/numaflow/pkg/udf/builtin"
 )
 
 func NewBuiltinUDFCommand() *cobra.Command {
diff --git a/cmd/commands/controller.go b/cmd/commands/controller.go
index 2db53339..c17b4e55 100644
--- a/cmd/commands/controller.go
+++ b/cmd/commands/controller.go
@@ -19,6 +19,7 @@ package commands
 import (
 	ctrlcmd "github.com/numaproj/numaflow/pkg/reconciler/cmd"
 	sharedutil "github.com/numaproj/numaflow/pkg/shared/util"
+
 	"github.com/spf13/cobra"
 )
 
diff --git a/cmd/commands/daemon_server.go b/cmd/commands/daemon_server.go
index db2db09a..d6655162 100644
--- a/cmd/commands/daemon_server.go
+++ b/cmd/commands/daemon_server.go
@@ -23,10 +23,11 @@ import (
 	"fmt"
 	"os"
 
+	"github.com/spf13/cobra"
+
 	"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1"
 	"github.com/numaproj/numaflow/pkg/daemon/server"
 	"github.com/numaproj/numaflow/pkg/shared/logging"
-	"github.com/spf13/cobra"
 )
 
 func NewDaemonServerCommand() *cobra.Command {
diff --git a/cmd/commands/processor.go b/cmd/commands/processor.go
index 435ccf41..9f4cd130 100644
--- a/cmd/commands/processor.go
+++ b/cmd/commands/processor.go
@@ -23,13 +23,14 @@ import (
 	"os"
 	"strconv"
 
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/controller-runtime/pkg/manager/signals"
+
 	dfv1 "github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1"
 	"github.com/numaproj/numaflow/pkg/shared/logging"
 	"github.com/numaproj/numaflow/pkg/sinks"
 	"github.com/numaproj/numaflow/pkg/sources"
 	"github.com/numaproj/numaflow/pkg/udf"
-	"github.com/spf13/cobra"
-	"sigs.k8s.io/controller-runtime/pkg/manager/signals"
 )
 
 func NewProcessorCommand() *cobra.Command {
diff --git a/cmd/commands/root.go b/cmd/commands/root.go
index 8579eb9c..fb0fa51e 100644
--- a/cmd/commands/root.go
+++ b/cmd/commands/root.go
@@ -41,6 +41,7 @@ func init() {
 	rootCmd.AddCommand(NewISBSvcBufferDeleteCommand())
 	rootCmd.AddCommand(NewISBSvcBufferValidateCommand())
 	rootCmd.AddCommand(NewBuiltinUDFCommand())
+	rootCmd.AddCommand(NewBuiltinTransformerCommand())
 	rootCmd.AddCommand(NewDaemonServerCommand())
 	rootCmd.AddCommand(NewServerCommand())
 }
diff --git a/cmd/commands/server.go b/cmd/commands/server.go
index 0c78eb68..8b017f6c 100644
--- a/cmd/commands/server.go
+++ b/cmd/commands/server.go
@@ -19,6 +19,7 @@ package commands
 import (
 	sharedutil "github.com/numaproj/numaflow/pkg/shared/util"
 	svrcmd "github.com/numaproj/numaflow/server/cmd"
+
 	"github.com/spf13/cobra"
 )
 
diff --git a/config/base/crds/full/numaflow.numaproj.io_pipelines.yaml b/config/base/crds/full/numaflow.numaproj.io_pipelines.yaml
index df791cb5..014df36b 100644
--- a/config/base/crds/full/numaflow.numaproj.io_pipelines.yaml
+++ b/config/base/crds/full/numaflow.numaproj.io_pipelines.yaml
@@ -3830,6 +3830,24 @@ spec:
                           type: object
                         transformer:
                           properties:
+                            builtin:
+                              properties:
+                                args:
+                                  items:
+                                    type: string
+                                  type: array
+                                kwargs:
+                                  additionalProperties:
+                                    type: string
+                                  type: object
+                                name:
+                                  enum:
+                                  - eventTimeExtractor
+                                  - filter
+                                  type: string
+                              required:
+                              - name
+                              type: object
                             container:
                               properties:
                                 args:
@@ -3942,8 +3960,6 @@ spec:
                                     type: object
                                   type: array
                               type: object
-                          required:
-                          - container
                           type: object
                       type: object
                     tolerations:
diff --git a/config/base/crds/full/numaflow.numaproj.io_vertices.yaml b/config/base/crds/full/numaflow.numaproj.io_vertices.yaml
index 3add5809..de3f9f73 100644
--- a/config/base/crds/full/numaflow.numaproj.io_vertices.yaml
+++ b/config/base/crds/full/numaflow.numaproj.io_vertices.yaml
@@ -2402,6 +2402,24 @@ spec:
                     type: object
                   transformer:
                     properties:
+                      builtin:
+                        properties:
+                          args:
+                            items:
+                              type: string
+                            type: array
+                          kwargs:
+                            additionalProperties:
+                              type: string
+                            type: object
+                          name:
+                            enum:
+                            - eventTimeExtractor
+                            - filter
+                            type: string
+                        required:
+                        - name
+                        type: object
                       container:
                         properties:
                           args:
@@ -2514,8 +2532,6 @@ spec:
                               type: object
                             type: array
                         type: object
-                    required:
-                    - container
                     type: object
                 type: object
               toEdges:
diff --git a/config/install.yaml b/config/install.yaml
index b2398e75..55b68cf5 100644
--- a/config/install.yaml
+++ b/config/install.yaml
@@ -6076,6 +6076,24 @@ spec:
                           type: object
                         transformer:
                           properties:
+                            builtin:
+                              properties:
+                                args:
+                                  items:
+                                    type: string
+                                  type: array
+                                kwargs:
+                                  additionalProperties:
+                                    type: string
+                                  type: object
+                                name:
+                                  enum:
+                                  - eventTimeExtractor
+                                  - filter
+                                  type: string
+                              required:
+                              - name
+                              type: object
                             container:
                               properties:
                                 args:
@@ -6188,8 +6206,6 @@ spec:
                                     type: object
                                   type: array
                               type: object
-                          required:
-                          - container
                           type: object
                       type: object
                     tolerations:
@@ -9569,6 +9585,24 @@ spec:
                     type: object
                   transformer:
                     properties:
+                      builtin:
+                        properties:
+                          args:
+                            items:
+                              type: string
+                            type: array
+                          kwargs:
+                            additionalProperties:
+                              type: string
+                            type: object
+                          name:
+                            enum:
+                            - eventTimeExtractor
+                            - filter
+                            type: string
+                        required:
+                        - name
+                        type: object
                       container:
                         properties:
                           args:
@@ -9681,8 +9715,6 @@ spec:
                               type: object
                             type: array
                         type: object
-                    required:
-                    - container
                     type: object
                 type: object
               toEdges:
diff --git a/config/namespace-install.yaml b/config/namespace-install.yaml
index 835d462b..1a68368c 100644
--- a/config/namespace-install.yaml
+++ b/config/namespace-install.yaml
@@ -6076,6 +6076,24 @@ spec:
                           type: object
                         transformer:
                           properties:
+                            builtin:
+                              properties:
+                                args:
+                                  items:
+                                    type: string
+                                  type: array
+                                kwargs:
+                                  additionalProperties:
+                                    type: string
+                                  type: object
+                                name:
+                                  enum:
+                                  - eventTimeExtractor
+                                  - filter
+                                  type: string
+                              required:
+                              - name
+                              type: object
                             container:
                               properties:
                                 args:
@@ -6188,8 +6206,6 @@ spec:
                                     type: object
                                   type: array
                               type: object
-                          required:
-                          - container
                           type: object
                       type: object
                     tolerations:
@@ -9569,6 +9585,24 @@ spec:
                     type: object
                   transformer:
                     properties:
+                      builtin:
+                        properties:
+                          args:
+                            items:
+                              type: string
+                            type: array
+                          kwargs:
+                            additionalProperties:
+                              type: string
+                            type: object
+                          name:
+                            enum:
+                            - eventTimeExtractor
+                            - filter
+                            type: string
+                        required:
+                        - name
+                        type: object
                       container:
                         properties:
                           args:
@@ -9681,8 +9715,6 @@ spec:
                               type: object
                             type: array
                         type: object
-                    required:
-                    - container
                     type: object
                 type: object
               toEdges:
diff --git a/docs/APIs.md b/docs/APIs.md
index 0d649c39..23689cc7 100644
--- a/docs/APIs.md
+++ b/docs/APIs.md
@@ -3791,6 +3791,52 @@ JobTemplate is used to customize Jobs
 </tr>
 </tbody>
 </table>
+<h3 id="numaflow.numaproj.io/v1alpha1.Transformer">
+Transformer
+</h3>
+<p>
+(<em>Appears on:</em>
+<a href="#numaflow.numaproj.io/v1alpha1.UDTransformer">UDTransformer</a>)
+</p>
+<p>
+</p>
+<table>
+<thead>
+<tr>
+<th>
+Field
+</th>
+<th>
+Description
+</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>
+<code>name</code></br> <em> string </em>
+</td>
+<td>
+</td>
+</tr>
+<tr>
+<td>
+<code>args</code></br> <em> \[\]string </em>
+</td>
+<td>
+<em>(Optional)</em>
+</td>
+</tr>
+<tr>
+<td>
+<code>kwargs</code></br> <em> map\[string\]string </em>
+</td>
+<td>
+<em>(Optional)</em>
+</td>
+</tr>
+</tbody>
+</table>
 <h3 id="numaflow.numaproj.io/v1alpha1.UDF">
 UDF
 </h3>
@@ -3899,6 +3945,17 @@ Description
 <a href="#numaflow.numaproj.io/v1alpha1.Container"> Container </a> </em>
 </td>
 <td>
+<em>(Optional)</em>
+</td>
+</tr>
+<tr>
+<td>
+<code>builtin</code></br> <em>
+<a href="#numaflow.numaproj.io/v1alpha1.Transformer"> Transformer </a>
+</em>
+</td>
+<td>
+<em>(Optional)</em>
 </td>
 </tr>
 </tbody>
diff --git a/pkg/apis/numaflow/v1alpha1/generated.pb.go b/pkg/apis/numaflow/v1alpha1/generated.pb.go
index 94e674b7..8de27ce1 100644
--- a/pkg/apis/numaflow/v1alpha1/generated.pb.go
+++ b/pkg/apis/numaflow/v1alpha1/generated.pb.go
@@ -1616,10 +1616,38 @@ func (m *Templates) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_Templates proto.InternalMessageInfo
 
+func (m *Transformer) Reset()      { *m = Transformer{} }
+func (*Transformer) ProtoMessage() {}
+func (*Transformer) Descriptor() ([]byte, []int) {
+	return fileDescriptor_9d0d1b17d3865563, []int{56}
+}
+func (m *Transformer) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *Transformer) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	b = b[:cap(b)]
+	n, err := m.MarshalToSizedBuffer(b)
+	if err != nil {
+		return nil, err
+	}
+	return b[:n], nil
+}
+func (m *Transformer) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Transformer.Merge(m, src)
+}
+func (m *Transformer) XXX_Size() int {
+	return m.Size()
+}
+func (m *Transformer) XXX_DiscardUnknown() {
+	xxx_messageInfo_Transformer.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Transformer proto.InternalMessageInfo
+
 func (m *UDF) Reset()      { *m = UDF{} }
 func (*UDF) ProtoMessage() {}
 func (*UDF) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{56}
+	return fileDescriptor_9d0d1b17d3865563, []int{57}
 }
 func (m *UDF) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1647,7 +1675,7 @@ var xxx_messageInfo_UDF proto.InternalMessageInfo
 func (m *UDSink) Reset()      { *m = UDSink{} }
 func (*UDSink) ProtoMessage() {}
 func (*UDSink) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{57}
+	return fileDescriptor_9d0d1b17d3865563, []int{58}
 }
 func (m *UDSink) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1675,7 +1703,7 @@ var xxx_messageInfo_UDSink proto.InternalMessageInfo
 func (m *UDTransformer) Reset()      { *m = UDTransformer{} }
 func (*UDTransformer) ProtoMessage() {}
 func (*UDTransformer) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{58}
+	return fileDescriptor_9d0d1b17d3865563, []int{59}
 }
 func (m *UDTransformer) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1703,7 +1731,7 @@ var xxx_messageInfo_UDTransformer proto.InternalMessageInfo
 func (m *Vertex) Reset()      { *m = Vertex{} }
 func (*Vertex) ProtoMessage() {}
 func (*Vertex) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{59}
+	return fileDescriptor_9d0d1b17d3865563, []int{60}
 }
 func (m *Vertex) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1731,7 +1759,7 @@ var xxx_messageInfo_Vertex proto.InternalMessageInfo
 func (m *VertexInstance) Reset()      { *m = VertexInstance{} }
 func (*VertexInstance) ProtoMessage() {}
 func (*VertexInstance) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{60}
+	return fileDescriptor_9d0d1b17d3865563, []int{61}
 }
 func (m *VertexInstance) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1759,7 +1787,7 @@ var xxx_messageInfo_VertexInstance proto.InternalMessageInfo
 func (m *VertexLimits) Reset()      { *m = VertexLimits{} }
 func (*VertexLimits) ProtoMessage() {}
 func (*VertexLimits) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{61}
+	return fileDescriptor_9d0d1b17d3865563, []int{62}
 }
 func (m *VertexLimits) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1787,7 +1815,7 @@ var xxx_messageInfo_VertexLimits proto.InternalMessageInfo
 func (m *VertexList) Reset()      { *m = VertexList{} }
 func (*VertexList) ProtoMessage() {}
 func (*VertexList) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{62}
+	return fileDescriptor_9d0d1b17d3865563, []int{63}
 }
 func (m *VertexList) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1815,7 +1843,7 @@ var xxx_messageInfo_VertexList proto.InternalMessageInfo
 func (m *VertexSpec) Reset()      { *m = VertexSpec{} }
 func (*VertexSpec) ProtoMessage() {}
 func (*VertexSpec) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{63}
+	return fileDescriptor_9d0d1b17d3865563, []int{64}
 }
 func (m *VertexSpec) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1843,7 +1871,7 @@ var xxx_messageInfo_VertexSpec proto.InternalMessageInfo
 func (m *VertexStatus) Reset()      { *m = VertexStatus{} }
 func (*VertexStatus) ProtoMessage() {}
 func (*VertexStatus) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{64}
+	return fileDescriptor_9d0d1b17d3865563, []int{65}
 }
 func (m *VertexStatus) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1871,7 +1899,7 @@ var xxx_messageInfo_VertexStatus proto.InternalMessageInfo
 func (m *Watermark) Reset()      { *m = Watermark{} }
 func (*Watermark) ProtoMessage() {}
 func (*Watermark) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{65}
+	return fileDescriptor_9d0d1b17d3865563, []int{66}
 }
 func (m *Watermark) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1899,7 +1927,7 @@ var xxx_messageInfo_Watermark proto.InternalMessageInfo
 func (m *Window) Reset()      { *m = Window{} }
 func (*Window) ProtoMessage() {}
 func (*Window) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9d0d1b17d3865563, []int{66}
+	return fileDescriptor_9d0d1b17d3865563, []int{67}
 }
 func (m *Window) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1989,6 +2017,8 @@ func init() {
 	proto.RegisterType((*Status)(nil), "github.com.numaproj.numaflow.pkg.apis.numaflow.v1alpha1.Status")
 	proto.RegisterType((*TLS)(nil), "github.com.numaproj.numaflow.pkg.apis.numaflow.v1alpha1.TLS")
 	proto.RegisterType((*Templates)(nil), "github.com.numaproj.numaflow.pkg.apis.numaflow.v1alpha1.Templates")
+	proto.RegisterType((*Transformer)(nil), "github.com.numaproj.numaflow.pkg.apis.numaflow.v1alpha1.Transformer")
+	proto.RegisterMapType((map[string]string)(nil), "github.com.numaproj.numaflow.pkg.apis.numaflow.v1alpha1.Transformer.KwargsEntry")
 	proto.RegisterType((*UDF)(nil), "github.com.numaproj.numaflow.pkg.apis.numaflow.v1alpha1.UDF")
 	proto.RegisterType((*UDSink)(nil), "github.com.numaproj.numaflow.pkg.apis.numaflow.v1alpha1.UDSink")
 	proto.RegisterType((*UDTransformer)(nil), "github.com.numaproj.numaflow.pkg.apis.numaflow.v1alpha1.UDTransformer")
@@ -2007,347 +2037,349 @@ func init() {
 }
 
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+	0xd6, 0xec, 0xfa, 0xc6, 0xfb, 0xc5, 0xe0, 0x95, 0x44, 0x75, 0xe3, 0x5d, 0x0d, 0xce, 0x18, 0x89,
+	0x8a, 0xc1, 0xc4, 0x91, 0x44, 0xaa, 0x00, 0x11, 0xfe, 0xd1, 0x63, 0x92, 0x8e, 0x29, 0xb3, 0xe4,
+	0x1a, 0x4c, 0xf7, 0x55, 0x1a, 0xf7, 0x4e, 0x34, 0xea, 0xc2, 0xc3, 0xc1, 0x8d, 0x18, 0x0f, 0x13,
+	0x92, 0x8f, 0xa8, 0xd0, 0xe4, 0x4f, 0xa4, 0x42, 0x13, 0x3f, 0x06, 0x56, 0x38, 0xf4, 0x18, 0x98,
+	0x03, 0x95, 0xb6, 0xe7, 0xf6, 0x44, 0x11, 0x44, 0xfd, 0xa3, 0xde, 0x84, 0x85, 0x95, 0x70, 0x51,
+	0x59, 0x0b, 0x70, 0x31, 0x32, 0xc1, 0x97, 0x69, 0xe6, 0x4a, 0x6b, 0xa5, 0x93, 0xb0, 0x16, 0x4e,
+	0xdd, 0x4d, 0x89, 0x8a, 0x01, 0x7c, 0xb2, 0xd0, 0x31, 0xf5, 0xc9, 0x14, 0x3a, 0xf4, 0x7f, 0xca,
+	0x05, 0xfe, 0xa2, 0x99, 0xba, 0x2f, 0xa4, 0x8d, 0xb8, 0x2f, 0xa4, 0x6e, 0xbe, 0xc6, 0x4b, 0x01,
+	0xcf, 0x41, 0xc9, 0xa3, 0x86, 0xef, 0x3a, 0xea, 0x0e, 0x79, 0xe8, 0x6d, 0x51, 0x50, 0x51, 0x71,
+	0xe3, 0x25, 0x83, 0xdc, 0x23, 0x4a, 0x06, 0x9f, 0x8f, 0x0d, 0x08, 0x59, 0x9b, 0x0d, 0xe7, 0x76,
+	0xc6, 0xa0, 0x10, 0xf9, 0x44, 0xf5, 0x2f, 0xe3, 0xc5, 0x74, 0x3e, 0x51, 0xfd, 0x03, 0x78, 0x28,
+	0x41, 0x5a, 0x30, 0x6d, 0x1b, 0x3e, 0x13, 0xb9, 0xa3, 0xd6, 0x32, 0x1b, 0xa3, 0x1e, 0x11, 0x4e,
+	0x9b, 0xf5, 0x18, 0x0e, 0x26, 0x50, 0xf5, 0xef, 0x6a, 0x10, 0x75, 0xf9, 0x31, 0x33, 0x97, 0xaf,
+	0x42, 0xb9, 0x67, 0x3c, 0x58, 0xa5, 0xb6, 0xb1, 0x37, 0xc9, 0xdf, 0x49, 0x6d, 0x28, 0x0c, 0x0c,
+	0xd1, 0xf4, 0x7d, 0x0d, 0xd4, 0x6d, 0x5a, 0x42, 0xa1, 0xd8, 0xb6, 0x1e, 0xa8, 0xf6, 0x4c, 0x12,
+	0xa9, 0xc4, 0xfe, 0xc0, 0x4c, 0xe6, 0x17, 0x04, 0x01, 0x25, 0x3a, 0xe9, 0xc1, 0x94, 0x2f, 0xd3,
+	0x3f, 0xea, 0x55, 0xc6, 0xdf, 0x95, 0x27, 0xd2, 0x48, 0xea, 0x2a, 0xae, 0x24, 0x61, 0x60, 0xa3,
+	0x5e, 0xfb, 0xe0, 0xe3, 0xf9, 0x27, 0x3e, 0xfc, 0x78, 0xfe, 0x89, 0x8f, 0x3e, 0x9e, 0x7f, 0xe2,
+	0x5b, 0x07, 0xf3, 0xda, 0x07, 0x07, 0xf3, 0xda, 0x87, 0x07, 0xf3, 0xda, 0x47, 0x07, 0xf3, 0xda,
+	0xbf, 0x1c, 0xcc, 0x6b, 0xbf, 0xff, 0xaf, 0xf3, 0x4f, 0xbc, 0x56, 0x0e, 0x30, 0xff, 0x37, 0x00,
+	0x00, 0xff, 0xff, 0xec, 0xb1, 0x23, 0x67, 0xd5, 0x60, 0x00, 0x00,
 }
 
 func (m *AbstractPodTemplate) Marshal() (dAtA []byte, err error) {
@@ -5749,6 +5781,67 @@ func (m *Templates) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *Transformer) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *Transformer) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *Transformer) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if len(m.KWArgs) > 0 {
+		keysForKWArgs := make([]string, 0, len(m.KWArgs))
+		for k := range m.KWArgs {
+			keysForKWArgs = append(keysForKWArgs, string(k))
+		}
+		github_com_gogo_protobuf_sortkeys.Strings(keysForKWArgs)
+		for iNdEx := len(keysForKWArgs) - 1; iNdEx >= 0; iNdEx-- {
+			v := m.KWArgs[string(keysForKWArgs[iNdEx])]
+			baseI := i
+			i -= len(v)
+			copy(dAtA[i:], v)
+			i = encodeVarintGenerated(dAtA, i, uint64(len(v)))
+			i--
+			dAtA[i] = 0x12
+			i -= len(keysForKWArgs[iNdEx])
+			copy(dAtA[i:], keysForKWArgs[iNdEx])
+			i = encodeVarintGenerated(dAtA, i, uint64(len(keysForKWArgs[iNdEx])))
+			i--
+			dAtA[i] = 0xa
+			i = encodeVarintGenerated(dAtA, i, uint64(baseI-i))
+			i--
+			dAtA[i] = 0x1a
+		}
+	}
+	if len(m.Args) > 0 {
+		for iNdEx := len(m.Args) - 1; iNdEx >= 0; iNdEx-- {
+			i -= len(m.Args[iNdEx])
+			copy(dAtA[i:], m.Args[iNdEx])
+			i = encodeVarintGenerated(dAtA, i, uint64(len(m.Args[iNdEx])))
+			i--
+			dAtA[i] = 0x12
+		}
+	}
+	i -= len(m.Name)
+	copy(dAtA[i:], m.Name)
+	i = encodeVarintGenerated(dAtA, i, uint64(len(m.Name)))
+	i--
+	dAtA[i] = 0xa
+	return len(dAtA) - i, nil
+}
+
 func (m *UDF) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -5861,6 +5954,18 @@ func (m *UDTransformer) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if m.Builtin != nil {
+		{
+			size, err := m.Builtin.MarshalToSizedBuffer(dAtA[:i])
+			if err != nil {
+				return 0, err
+			}
+			i -= size
+			i = encodeVarintGenerated(dAtA, i, uint64(size))
+		}
+		i--
+		dAtA[i] = 0x12
+	}
 	if m.Container != nil {
 		{
 			size, err := m.Container.MarshalToSizedBuffer(dAtA[:i])
@@ -7570,6 +7675,31 @@ func (m *Templates) Size() (n int) {
 	return n
 }
 
+func (m *Transformer) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Name)
+	n += 1 + l + sovGenerated(uint64(l))
+	if len(m.Args) > 0 {
+		for _, s := range m.Args {
+			l = len(s)
+			n += 1 + l + sovGenerated(uint64(l))
+		}
+	}
+	if len(m.KWArgs) > 0 {
+		for k, v := range m.KWArgs {
+			_ = k
+			_ = v
+			mapEntrySize := 1 + len(k) + sovGenerated(uint64(len(k))) + 1 + len(v) + sovGenerated(uint64(len(v)))
+			n += mapEntrySize + 1 + sovGenerated(uint64(mapEntrySize))
+		}
+	}
+	return n
+}
+
 func (m *UDF) Size() (n int) {
 	if m == nil {
 		return 0
@@ -7612,6 +7742,10 @@ func (m *UDTransformer) Size() (n int) {
 		l = m.Container.Size()
 		n += 1 + l + sovGenerated(uint64(l))
 	}
+	if m.Builtin != nil {
+		l = m.Builtin.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
 	return n
 }
 
@@ -8664,6 +8798,28 @@ func (this *Templates) String() string {
 	}, "")
 	return s
 }
+func (this *Transformer) String() string {
+	if this == nil {
+		return "nil"
+	}
+	keysForKWArgs := make([]string, 0, len(this.KWArgs))
+	for k := range this.KWArgs {
+		keysForKWArgs = append(keysForKWArgs, k)
+	}
+	github_com_gogo_protobuf_sortkeys.Strings(keysForKWArgs)
+	mapStringForKWArgs := "map[string]string{"
+	for _, k := range keysForKWArgs {
+		mapStringForKWArgs += fmt.Sprintf("%v: %v,", k, this.KWArgs[k])
+	}
+	mapStringForKWArgs += "}"
+	s := strings.Join([]string{`&Transformer{`,
+		`Name:` + fmt.Sprintf("%v", this.Name) + `,`,
+		`Args:` + fmt.Sprintf("%v", this.Args) + `,`,
+		`KWArgs:` + mapStringForKWArgs + `,`,
+		`}`,
+	}, "")
+	return s
+}
 func (this *UDF) String() string {
 	if this == nil {
 		return "nil"
@@ -8692,6 +8848,7 @@ func (this *UDTransformer) String() string {
 	}
 	s := strings.Join([]string{`&UDTransformer{`,
 		`Container:` + strings.Replace(this.Container.String(), "Container", "Container", 1) + `,`,
+		`Builtin:` + strings.Replace(this.Builtin.String(), "Transformer", "Transformer", 1) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -19710,6 +19867,247 @@ func (m *Templates) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *Transformer) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowGenerated
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: Transformer: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: Transformer: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Name", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Name = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Args", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Args = append(m.Args, string(dAtA[iNdEx:postIndex]))
+			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field KWArgs", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.KWArgs == nil {
+				m.KWArgs = make(map[string]string)
+			}
+			var mapkey string
+			var mapvalue string
+			for iNdEx < postIndex {
+				entryPreIndex := iNdEx
+				var wire uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowGenerated
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					wire |= uint64(b&0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				fieldNum := int32(wire >> 3)
+				if fieldNum == 1 {
+					var stringLenmapkey uint64
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowGenerated
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						stringLenmapkey |= uint64(b&0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					intStringLenmapkey := int(stringLenmapkey)
+					if intStringLenmapkey < 0 {
+						return ErrInvalidLengthGenerated
+					}
+					postStringIndexmapkey := iNdEx + intStringLenmapkey
+					if postStringIndexmapkey < 0 {
+						return ErrInvalidLengthGenerated
+					}
+					if postStringIndexmapkey > l {
+						return io.ErrUnexpectedEOF
+					}
+					mapkey = string(dAtA[iNdEx:postStringIndexmapkey])
+					iNdEx = postStringIndexmapkey
+				} else if fieldNum == 2 {
+					var stringLenmapvalue uint64
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowGenerated
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						stringLenmapvalue |= uint64(b&0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					intStringLenmapvalue := int(stringLenmapvalue)
+					if intStringLenmapvalue < 0 {
+						return ErrInvalidLengthGenerated
+					}
+					postStringIndexmapvalue := iNdEx + intStringLenmapvalue
+					if postStringIndexmapvalue < 0 {
+						return ErrInvalidLengthGenerated
+					}
+					if postStringIndexmapvalue > l {
+						return io.ErrUnexpectedEOF
+					}
+					mapvalue = string(dAtA[iNdEx:postStringIndexmapvalue])
+					iNdEx = postStringIndexmapvalue
+				} else {
+					iNdEx = entryPreIndex
+					skippy, err := skipGenerated(dAtA[iNdEx:])
+					if err != nil {
+						return err
+					}
+					if (skippy < 0) || (iNdEx+skippy) < 0 {
+						return ErrInvalidLengthGenerated
+					}
+					if (iNdEx + skippy) > postIndex {
+						return io.ErrUnexpectedEOF
+					}
+					iNdEx += skippy
+				}
+			}
+			m.KWArgs[mapkey] = mapvalue
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipGenerated(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *UDF) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
@@ -20016,6 +20414,42 @@ func (m *UDTransformer) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Builtin", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Builtin == nil {
+				m.Builtin = &Transformer{}
+			}
+			if err := m.Builtin.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGenerated(dAtA[iNdEx:])
diff --git a/pkg/apis/numaflow/v1alpha1/generated.proto b/pkg/apis/numaflow/v1alpha1/generated.proto
index d33b8328..f4e9fec8 100644
--- a/pkg/apis/numaflow/v1alpha1/generated.proto
+++ b/pkg/apis/numaflow/v1alpha1/generated.proto
@@ -963,6 +963,17 @@ message Templates {
   optional JobTemplate job = 2;
 }
 
+message Transformer {
+  // +kubebuilder:validation:Enum=eventTimeExtractor;filter
+  optional string name = 1;
+
+  // +optional
+  repeated string args = 2;
+
+  // +optional
+  map<string, string> kwargs = 3;
+}
+
 message UDF {
   // +optional
   optional Container container = 1;
@@ -979,7 +990,11 @@ message UDSink {
 }
 
 message UDTransformer {
+  // +optional
   optional Container container = 1;
+
+  // +optional
+  optional Transformer builtin = 2;
 }
 
 // +genclient
diff --git a/pkg/apis/numaflow/v1alpha1/openapi_generated.go b/pkg/apis/numaflow/v1alpha1/openapi_generated.go
index b3b2dc6f..68719462 100644
--- a/pkg/apis/numaflow/v1alpha1/openapi_generated.go
+++ b/pkg/apis/numaflow/v1alpha1/openapi_generated.go
@@ -86,6 +86,7 @@ func GetOpenAPIDefinitions(ref common.ReferenceCallback) map[string]common.OpenA
 		"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.Status":                         schema_pkg_apis_numaflow_v1alpha1_Status(ref),
 		"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.TLS":                            schema_pkg_apis_numaflow_v1alpha1_TLS(ref),
 		"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.Templates":                      schema_pkg_apis_numaflow_v1alpha1_Templates(ref),
+		"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.Transformer":                    schema_pkg_apis_numaflow_v1alpha1_Transformer(ref),
 		"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.UDF":                            schema_pkg_apis_numaflow_v1alpha1_UDF(ref),
 		"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.UDSink":                         schema_pkg_apis_numaflow_v1alpha1_UDSink(ref),
 		"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.UDTransformer":                  schema_pkg_apis_numaflow_v1alpha1_UDTransformer(ref),
@@ -3144,6 +3145,55 @@ func schema_pkg_apis_numaflow_v1alpha1_Templates(ref common.ReferenceCallback) c
 	}
 }
 
+func schema_pkg_apis_numaflow_v1alpha1_Transformer(ref common.ReferenceCallback) common.OpenAPIDefinition {
+	return common.OpenAPIDefinition{
+		Schema: spec.Schema{
+			SchemaProps: spec.SchemaProps{
+				Type: []string{"object"},
+				Properties: map[string]spec.Schema{
+					"name": {
+						SchemaProps: spec.SchemaProps{
+							Default: "",
+							Type:    []string{"string"},
+							Format:  "",
+						},
+					},
+					"args": {
+						SchemaProps: spec.SchemaProps{
+							Type: []string{"array"},
+							Items: &spec.SchemaOrArray{
+								Schema: &spec.Schema{
+									SchemaProps: spec.SchemaProps{
+										Default: "",
+										Type:    []string{"string"},
+										Format:  "",
+									},
+								},
+							},
+						},
+					},
+					"kwargs": {
+						SchemaProps: spec.SchemaProps{
+							Type: []string{"object"},
+							AdditionalProperties: &spec.SchemaOrBool{
+								Allows: true,
+								Schema: &spec.Schema{
+									SchemaProps: spec.SchemaProps{
+										Default: "",
+										Type:    []string{"string"},
+										Format:  "",
+									},
+								},
+							},
+						},
+					},
+				},
+				Required: []string{"name"},
+			},
+		},
+	}
+}
+
 func schema_pkg_apis_numaflow_v1alpha1_UDF(ref common.ReferenceCallback) common.OpenAPIDefinition {
 	return common.OpenAPIDefinition{
 		Schema: spec.Schema{
@@ -3205,12 +3255,16 @@ func schema_pkg_apis_numaflow_v1alpha1_UDTransformer(ref common.ReferenceCallbac
 							Ref: ref("github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.Container"),
 						},
 					},
+					"builtin": {
+						SchemaProps: spec.SchemaProps{
+							Ref: ref("github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.Transformer"),
+						},
+					},
 				},
-				Required: []string{"container"},
 			},
 		},
 		Dependencies: []string{
-			"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.Container"},
+			"github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.Container", "github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1.Transformer"},
 	}
 }
 
diff --git a/pkg/apis/numaflow/v1alpha1/source.go b/pkg/apis/numaflow/v1alpha1/source.go
index 7686c40d..90b40418 100644
--- a/pkg/apis/numaflow/v1alpha1/source.go
+++ b/pkg/apis/numaflow/v1alpha1/source.go
@@ -17,6 +17,11 @@ limitations under the License.
 package v1alpha1
 
 import (
+	"encoding/base64"
+	"fmt"
+	"sort"
+	"strings"
+
 	corev1 "k8s.io/api/core/v1"
 )
 
@@ -52,14 +57,36 @@ func (s Source) getUDTransformerContainer(req getContainerReq) corev1.Container
 		init(req).
 		name(CtrUdtransformer)
 	c.Env = nil
-	x := s.UDTransformer.Container
-	c = c.image(x.Image)
-	if len(x.Command) > 0 {
-		c = c.command(x.Command...)
-	}
-	if len(x.Args) > 0 {
-		c = c.args(x.Args...)
+	if x := s.UDTransformer.Container; x != nil && x.Image != "" { // customized image
+		c = c.image(x.Image)
+		if len(x.Command) > 0 {
+			c = c.command(x.Command...)
+		}
+		if len(x.Args) > 0 {
+			c = c.args(x.Args...)
+		}
+		c = c.appendEnv(x.Env...).appendVolumeMounts(x.VolumeMounts...).resources(x.Resources)
+	} else { // built-in
+		args := []string{"builtin-transformer", "--name=" + s.UDTransformer.Builtin.Name}
+		for _, a := range s.UDTransformer.Builtin.Args {
+			args = append(args, "--args="+base64.StdEncoding.EncodeToString([]byte(a)))
+		}
+		var kwargs []string
+		for k, v := range s.UDTransformer.Builtin.KWArgs {
+			kwargs = append(kwargs, fmt.Sprintf("%s=%s", k, base64.StdEncoding.EncodeToString([]byte(v))))
+		}
+		if len(kwargs) > 0 {
+			// The order of the kwargs items is random because we construct it from an unordered map Builtin.KWArgs.
+			// We sort the kwargs first before converting it to a string argument to ensure consistency.
+			// This is important because in vertex controller we use hash on PodSpec to determine if a pod already exists, which requires the kwargs being consistent.
+			sort.Strings(kwargs)
+			args = append(args, "--kwargs="+strings.Join(kwargs, ","))
+		}
+
+		c = c.image(req.image).args(args...)
+		if x := s.UDTransformer.Container; x != nil {
+			c = c.appendEnv(x.Env...).appendVolumeMounts(x.VolumeMounts...).resources(x.Resources)
+		}
 	}
-	c = c.appendEnv(x.Env...).appendVolumeMounts(x.VolumeMounts...).resources(x.Resources)
 	return c.build()
 }
diff --git a/pkg/apis/numaflow/v1alpha1/udf.go b/pkg/apis/numaflow/v1alpha1/udf.go
index b334b0f8..982d8319 100644
--- a/pkg/apis/numaflow/v1alpha1/udf.go
+++ b/pkg/apis/numaflow/v1alpha1/udf.go
@@ -19,6 +19,7 @@ package v1alpha1
 import (
 	"encoding/base64"
 	"fmt"
+	"sort"
 	"strings"
 
 	corev1 "k8s.io/api/core/v1"
@@ -96,6 +97,10 @@ func (in UDF) getUDFContainer(req getContainerReq) corev1.Container {
 			kwargs = append(kwargs, fmt.Sprintf("%s=%s", k, base64.StdEncoding.EncodeToString([]byte(v))))
 		}
 		if len(kwargs) > 0 {
+			// The order of the kwargs items is random because we construct it from an unordered map Builtin.KWArgs.
+			// We sort the kwargs first before converting it to a string argument to ensure consistency.
+			// This is important because in vertex controller we use hash on PodSpec to determine if a pod already exists, which requires the kwargs being consistent.
+			sort.Strings(kwargs)
 			args = append(args, "--kwargs="+strings.Join(kwargs, ","))
 		}
 
diff --git a/pkg/apis/numaflow/v1alpha1/user_defined_source_transformer.go b/pkg/apis/numaflow/v1alpha1/user_defined_source_transformer.go
index f12b8d83..fe8eb98d 100644
--- a/pkg/apis/numaflow/v1alpha1/user_defined_source_transformer.go
+++ b/pkg/apis/numaflow/v1alpha1/user_defined_source_transformer.go
@@ -17,5 +17,17 @@ limitations under the License.
 package v1alpha1
 
 type UDTransformer struct {
+	// +optional
 	Container *Container `json:"container" protobuf:"bytes,1,opt,name=container"`
+	// +optional
+	Builtin *Transformer `json:"builtin" protobuf:"bytes,2,opt,name=builtin"`
+}
+
+type Transformer struct {
+	// +kubebuilder:validation:Enum=eventTimeExtractor;filter
+	Name string `json:"name" protobuf:"bytes,1,opt,name=name"`
+	// +optional
+	Args []string `json:"args,omitempty" protobuf:"bytes,2,rep,name=args"`
+	// +optional
+	KWArgs map[string]string `json:"kwargs,omitempty" protobuf:"bytes,3,rep,name=kwargs"`
 }
diff --git a/pkg/apis/numaflow/v1alpha1/zz_generated.deepcopy.go b/pkg/apis/numaflow/v1alpha1/zz_generated.deepcopy.go
index fcf1c789..1040511d 100644
--- a/pkg/apis/numaflow/v1alpha1/zz_generated.deepcopy.go
+++ b/pkg/apis/numaflow/v1alpha1/zz_generated.deepcopy.go
@@ -1681,6 +1681,34 @@ func (in *Templates) DeepCopy() *Templates {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *Transformer) DeepCopyInto(out *Transformer) {
+	*out = *in
+	if in.Args != nil {
+		in, out := &in.Args, &out.Args
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.KWArgs != nil {
+		in, out := &in.KWArgs, &out.KWArgs
+		*out = make(map[string]string, len(*in))
+		for key, val := range *in {
+			(*out)[key] = val
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Transformer.
+func (in *Transformer) DeepCopy() *Transformer {
+	if in == nil {
+		return nil
+	}
+	out := new(Transformer)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *UDF) DeepCopyInto(out *UDF) {
 	*out = *in
@@ -1737,6 +1765,11 @@ func (in *UDTransformer) DeepCopyInto(out *UDTransformer) {
 		*out = new(Container)
 		(*in).DeepCopyInto(*out)
 	}
+	if in.Builtin != nil {
+		in, out := &in.Builtin, &out.Builtin
+		*out = new(Transformer)
+		(*in).DeepCopyInto(*out)
+	}
 	return
 }
 
diff --git a/pkg/reconciler/pipeline/validate.go b/pkg/reconciler/pipeline/validate.go
index ae0c3a68..1703c87a 100644
--- a/pkg/reconciler/pipeline/validate.go
+++ b/pkg/reconciler/pipeline/validate.go
@@ -41,6 +41,7 @@ func ValidatePipeline(pl *dfv1.Pipeline) error {
 	}
 	names := make(map[string]bool)
 	sources := make(map[string]dfv1.AbstractVertex)
+	udTransformers := make(map[string]dfv1.AbstractVertex)
 	sinks := make(map[string]dfv1.AbstractVertex)
 	mapUdfs := make(map[string]dfv1.AbstractVertex)
 	reduceUdfs := make(map[string]dfv1.AbstractVertex)
@@ -58,6 +59,9 @@ func ValidatePipeline(pl *dfv1.Pipeline) error {
 				return fmt.Errorf("invalid vertex %q, only one of 'source', 'sink' and 'udf' can be specified", v.Name)
 			}
 			sources[v.Name] = v
+			if v.Source.UDTransformer != nil {
+				udTransformers[v.Name] = v
+			}
 		}
 		if v.Sink != nil {
 			if v.Source != nil || v.UDF != nil {
@@ -85,9 +89,17 @@ func ValidatePipeline(pl *dfv1.Pipeline) error {
 		return fmt.Errorf("pipeline has no sink, at least one vertex with 'sink' defined is required")
 	}
 
-	for k, s := range sources {
-		if x := s.Source.UDTransformer; x != nil && x.Container != nil && x.Container.Image == "" {
-			return fmt.Errorf("invalid vertex %q, can not specify an empty image for a customized source data transformer", k)
+	for k, t := range udTransformers {
+		transformer := t.Source.UDTransformer
+		if transformer.Container != nil {
+			if transformer.Container.Image == "" && transformer.Builtin == nil {
+				return fmt.Errorf("invalid source vertex %q, either specify a builtin transformer, or a customized image", k)
+			}
+			if transformer.Container.Image != "" && transformer.Builtin != nil {
+				return fmt.Errorf("invalid source vertex %q, can not specify both builtin transformer, and a customized image", k)
+			}
+		} else if transformer.Builtin == nil {
+			return fmt.Errorf("invalid source vertex %q, either specify a builtin transformer, or a customized image", k)
 		}
 	}
 
diff --git a/pkg/reconciler/vertex/controller.go b/pkg/reconciler/vertex/controller.go
index 29a7de64..051e5244 100644
--- a/pkg/reconciler/vertex/controller.go
+++ b/pkg/reconciler/vertex/controller.go
@@ -23,11 +23,6 @@ import (
 	"strings"
 	"time"
 
-	dfv1 "github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1"
-	"github.com/numaproj/numaflow/pkg/reconciler"
-	"github.com/numaproj/numaflow/pkg/reconciler/vertex/scaling"
-	"github.com/numaproj/numaflow/pkg/shared/logging"
-	sharedutil "github.com/numaproj/numaflow/pkg/shared/util"
 	"go.uber.org/zap"
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/equality"
@@ -39,6 +34,12 @@ import (
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+
+	dfv1 "github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1"
+	"github.com/numaproj/numaflow/pkg/reconciler"
+	"github.com/numaproj/numaflow/pkg/reconciler/vertex/scaling"
+	"github.com/numaproj/numaflow/pkg/shared/logging"
+	sharedutil "github.com/numaproj/numaflow/pkg/shared/util"
 )
 
 // vertexReconciler reconciles a vertex object.
diff --git a/pkg/shared/expr/eval.go b/pkg/shared/expr/eval_bool.go
similarity index 99%
rename from pkg/shared/expr/eval.go
rename to pkg/shared/expr/eval_bool.go
index 171792e5..683fdb9f 100644
--- a/pkg/shared/expr/eval.go
+++ b/pkg/shared/expr/eval_bool.go
@@ -19,9 +19,10 @@ package expr
 import (
 	"encoding/json"
 	"fmt"
+	"strconv"
+
 	"github.com/Masterminds/sprig/v3"
 	"github.com/antonmedv/expr"
-	"strconv"
 )
 
 var sprigFuncMap = sprig.GenericFuncMap()
diff --git a/pkg/shared/expr/eval_test.go b/pkg/shared/expr/eval_bool_test.go
similarity index 100%
rename from pkg/shared/expr/eval_test.go
rename to pkg/shared/expr/eval_bool_test.go
diff --git a/pkg/shared/expr/eval_string.go b/pkg/shared/expr/eval_string.go
new file mode 100644
index 00000000..be581e82
--- /dev/null
+++ b/pkg/shared/expr/eval_string.go
@@ -0,0 +1,42 @@
+/*
+Copyright 2022 The Numaproj Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package expr
+
+import (
+	"fmt"
+
+	"github.com/antonmedv/expr"
+)
+
+// EvalStr uses the given input expression to evaluate input message and compile it to a string.
+// See examples in compile_test.go
+func EvalStr(expression string, msg []byte) (string, error) {
+	msgMap := map[string]interface{}{
+		root: string(msg),
+	}
+	env := getFuncMap(msgMap)
+	program, err := expr.Compile(expression, expr.Env(env))
+	if err != nil {
+		return "", fmt.Errorf("unable to compile expression '%s': %s", expression, err)
+	}
+
+	result, err := expr.Run(program, env)
+	if err != nil {
+		return "", fmt.Errorf("unable to execute compiled program %v", err)
+	}
+	return fmt.Sprintf("%v", result), nil
+}
diff --git a/pkg/sources/transformer/builtin/builtin.go b/pkg/sources/transformer/builtin/builtin.go
new file mode 100644
index 00000000..2590e329
--- /dev/null
+++ b/pkg/sources/transformer/builtin/builtin.go
@@ -0,0 +1,60 @@
+/*
+Copyright 2022 The Numaproj Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package builtin
+
+import (
+	"context"
+	"fmt"
+
+	functionsdk "github.com/numaproj/numaflow-go/pkg/function"
+	"github.com/numaproj/numaflow-go/pkg/function/server"
+	"go.uber.org/zap"
+
+	"github.com/numaproj/numaflow/pkg/shared/logging"
+	eventtime "github.com/numaproj/numaflow/pkg/sources/transformer/builtin/event_time"
+	"github.com/numaproj/numaflow/pkg/sources/transformer/builtin/filter"
+)
+
+type Builtin struct {
+	Name   string
+	Args   []string
+	KWArgs map[string]string
+}
+
+func (b *Builtin) Start(ctx context.Context) error {
+	log := logging.FromContext(ctx)
+	log.Infow("Start a builtin transformer", zap.Any("name", b.Name), zap.Strings("args", b.Args), zap.Any("kwargs", b.KWArgs))
+
+	executor, err := b.executor()
+	if err != nil {
+		return err
+	}
+	server.New().RegisterMapperT(executor).Start(ctx)
+	return nil
+}
+
+func (b *Builtin) executor() (functionsdk.MapTFunc, error) {
+	// TODO: deal with args later
+	switch b.Name {
+	case "filter":
+		return filter.New(b.KWArgs)
+	case "eventTimeExtractor":
+		return eventtime.New(b.KWArgs)
+	default:
+		return nil, fmt.Errorf("unrecognized transformer %q", b.Name)
+	}
+}
diff --git a/pkg/sources/transformer/builtin/event_time/event_time_extractor.go b/pkg/sources/transformer/builtin/event_time/event_time_extractor.go
new file mode 100644
index 00000000..828d7ce8
--- /dev/null
+++ b/pkg/sources/transformer/builtin/event_time/event_time_extractor.go
@@ -0,0 +1,78 @@
+/*
+Copyright 2022 The Numaproj Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package eventtime
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	functionsdk "github.com/numaproj/numaflow-go/pkg/function"
+
+	"github.com/numaproj/numaflow/pkg/shared/expr"
+	"github.com/numaproj/numaflow/pkg/shared/logging"
+)
+
+type eventTimeExtractor struct {
+	// expression is used to extract the string representation of the event time from message payload.
+	// e.g. `json(payload).metadata.time`
+	expression string
+	// format specifies the layout of extracted time string.
+	// With format, we use the time.Parse function to translate the event time string representation to time.Time object.
+	format string
+}
+
+func New(args map[string]string) (functionsdk.MapTFunc, error) {
+	expr, existing := args["expression"]
+	if !existing {
+		return nil, fmt.Errorf(`missing "expression"`)
+	}
+
+	format, existing := args["format"]
+	if !existing {
+		return nil, fmt.Errorf("missing \"format\"")
+	}
+
+	e := eventTimeExtractor{
+		expression: expr,
+		format:     format,
+	}
+
+	return func(ctx context.Context, key string, datum functionsdk.Datum) functionsdk.MessageTs {
+		log := logging.FromContext(ctx)
+		resultMsg, err := e.apply(datum.EventTime(), datum.Value())
+		if err != nil {
+			log.Warnf("event time extractor got an error: %v, skip updating event time...", err)
+		}
+		return functionsdk.MessageTsBuilder().Append(resultMsg)
+	}, nil
+}
+
+// apply compiles the payload to extract the new event time. If there is any error during extraction,
+// we pass on the default event time. Otherwise, we assign the new event time to the message.
+func (e eventTimeExtractor) apply(et time.Time, payload []byte) (functionsdk.MessageT, error) {
+	timeStr, err := expr.EvalStr(e.expression, payload)
+	if err != nil {
+		return functionsdk.MessageTToAll(et, payload), err
+	}
+	newEventTime, err := time.Parse(e.format, timeStr)
+	if err != nil {
+		return functionsdk.MessageTToAll(et, payload), err
+	} else {
+		return functionsdk.MessageTToAll(newEventTime, payload), nil
+	}
+}
diff --git a/pkg/sources/transformer/builtin/filter/filter.go b/pkg/sources/transformer/builtin/filter/filter.go
new file mode 100644
index 00000000..151c976b
--- /dev/null
+++ b/pkg/sources/transformer/builtin/filter/filter.go
@@ -0,0 +1,62 @@
+/*
+Copyright 2022 The Numaproj Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package filter
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	functionsdk "github.com/numaproj/numaflow-go/pkg/function"
+
+	"github.com/numaproj/numaflow/pkg/shared/expr"
+	"github.com/numaproj/numaflow/pkg/shared/logging"
+)
+
+type filter struct {
+	expression string
+}
+
+func New(args map[string]string) (functionsdk.MapTFunc, error) {
+	expr, existing := args["expression"]
+	if !existing {
+		return nil, fmt.Errorf(`missing "expression"`)
+	}
+	f := filter{
+		expression: expr,
+	}
+
+	return func(ctx context.Context, key string, datum functionsdk.Datum) functionsdk.MessageTs {
+		log := logging.FromContext(ctx)
+		resultMsg, err := f.apply(datum.EventTime(), datum.Value())
+		if err != nil {
+			log.Errorf("Filter map function apply got an error: %v", err)
+		}
+		return functionsdk.MessageTsBuilder().Append(resultMsg)
+	}, nil
+}
+
+func (f filter) apply(et time.Time, msg []byte) (functionsdk.MessageT, error) {
+	result, err := expr.EvalBool(f.expression, msg)
+	if err != nil {
+		return functionsdk.MessageTToDrop(), err
+	}
+	if result {
+		return functionsdk.MessageTToAll(et, msg), nil
+	}
+	return functionsdk.MessageTToDrop(), nil
+}
diff --git a/pkg/udf/builtin/filter/filter.go b/pkg/udf/builtin/filter/filter.go
index ab4f88e2..f86b0e51 100644
--- a/pkg/udf/builtin/filter/filter.go
+++ b/pkg/udf/builtin/filter/filter.go
@@ -33,7 +33,7 @@ type filter struct {
 func New(args map[string]string) (functionsdk.MapFunc, error) {
 	expr, existing := args["expression"]
 	if !existing {
-		return nil, fmt.Errorf("missing \"expression\"")
+		return nil, fmt.Errorf(`missing "expression"`)
 	}
 	f := filter{
 		expression: expr,


Test patch:
diff --git a/cmd/commands/commands_test.go b/cmd/commands/commands_test.go
index be4295b4..9f4d222b 100644
--- a/cmd/commands/commands_test.go
+++ b/cmd/commands/commands_test.go
@@ -24,8 +24,10 @@ import (
 	"os"
 	"testing"
 
-	dfv1 "github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1"
 	"github.com/stretchr/testify/assert"
+
+	dfv1 "github.com/numaproj/numaflow/pkg/apis/numaflow/v1alpha1"
+
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
diff --git a/pkg/apis/numaflow/v1alpha1/source_test.go b/pkg/apis/numaflow/v1alpha1/source_test.go
index 46d6b841..b6fa8b89 100644
--- a/pkg/apis/numaflow/v1alpha1/source_test.go
+++ b/pkg/apis/numaflow/v1alpha1/source_test.go
@@ -17,26 +17,122 @@ limitations under the License.
 package v1alpha1
 
 import (
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	corev1 "k8s.io/api/core/v1"
-	resource "k8s.io/apimachinery/pkg/api/resource"
+	"k8s.io/apimachinery/pkg/api/resource"
 )
 
-func Test_Source_getContainers(t *testing.T) {
-	s := Source{}
-	c, err := s.getContainers(getContainerReq{
-		env: []corev1.EnvVar{
-			{Name: "test-env", Value: "test-val"},
+func TestSource_getContainers(t *testing.T) {
+	x := Source{
+		UDTransformer: &UDTransformer{
+			Container: &Container{
+				Image:        "my-image",
+				VolumeMounts: []corev1.VolumeMount{{Name: "my-vm"}},
+				Command:      []string{"my-cmd"},
+				Args:         []string{"my-arg"},
+				Env:          []corev1.EnvVar{{Name: "my-envvar"}},
+				Resources: corev1.ResourceRequirements{
+					Requests: map[corev1.ResourceName]resource.Quantity{
+						"cpu": resource.MustParse("2"),
+					},
+				},
+			},
 		},
-		isbSvcType:      ISBSvcTypeRedis,
-		imagePullPolicy: corev1.PullIfNotPresent,
-		image:           testFlowImage,
-		resources:       corev1.ResourceRequirements{Requests: map[corev1.ResourceName]resource.Quantity{"cpu": resource.MustParse("2")}},
+	}
+	c, err := x.getContainers(getContainerReq{
+		image: "main-image",
 	})
 	assert.NoError(t, err)
-	assert.Equal(t, 1, len(c))
-	assert.Equal(t, testFlowImage, c[0].Image)
-	assert.Equal(t, corev1.ResourceRequirements{Requests: map[corev1.ResourceName]resource.Quantity{"cpu": resource.MustParse("2")}}, c[0].Resources)
+	assert.Equal(t, 2, len(c))
+	assert.Equal(t, "main-image", c[0].Image)
+	assert.Equal(t, x.UDTransformer.Container.Image, c[1].Image)
+	assert.Contains(t, c[1].VolumeMounts, c[1].VolumeMounts[0])
+	assert.Equal(t, x.UDTransformer.Container.Command, c[1].Command)
+	assert.Equal(t, x.UDTransformer.Container.Args, c[1].Args)
+	assert.Equal(t, x.UDTransformer.Container.Env, c[1].Env)
+	assert.Equal(t, corev1.ResourceRequirements{Requests: map[corev1.ResourceName]resource.Quantity{"cpu": resource.MustParse("2")}}, c[1].Resources)
+}
+
+func Test_getTransformerContainer(t *testing.T) {
+	t.Run("with customized image", func(t *testing.T) {
+		x := Source{
+			HTTP: &HTTPSource{},
+			UDTransformer: &UDTransformer{
+				Container: &Container{
+					Image: "my-image",
+					Args:  []string{"my-arg"},
+				},
+			},
+		}
+		c := x.getUDTransformerContainer(getContainerReq{
+			image: "main-image",
+		})
+		assert.Equal(t, "my-image", c.Image)
+		assert.Contains(t, c.Args, "my-arg")
+	})
+
+	t.Run("with built-in transformers", func(t *testing.T) {
+		x := Source{
+			HTTP: &HTTPSource{},
+			UDTransformer: &UDTransformer{
+				Builtin: &Transformer{
+					Name: "filter",
+					KWArgs: map[string]string{
+						"expression": "json(payload).a > 1",
+					},
+				},
+			}}
+		c := x.getUDTransformerContainer(getContainerReq{
+			image: "main-image",
+			env: []corev1.EnvVar{
+				{Name: "a", Value: "b"},
+			},
+		})
+		assert.Equal(t, "main-image", c.Image)
+		assert.Contains(t, c.Args, "--name=filter")
+		// log.Print(c.Args)
+		envNames := []string{}
+		for _, e := range c.Env {
+			envNames = append(envNames, e.Name)
+		}
+		assert.NotContains(t, envNames, "a")
+	})
+
+	t.Run("with built-in transformers, with multiple KWArgs", func(t *testing.T) {
+		// This test verify when we have multiple KWArgs in map, after converting them to a single `--kwargs=a=x,b=y...` string, we maintain a consistent order.
+		x := Source{
+			HTTP: &HTTPSource{},
+			UDTransformer: &UDTransformer{
+				Builtin: &Transformer{
+					Name: "filter",
+					KWArgs: map[string]string{
+						"expression": "json(payload).time",
+						"format":     "2021-01-01",
+						"extra-arg1": "1",
+						"extra-arg2": "2",
+						"extra-arg3": "3",
+						"extra-arg4": "4",
+					},
+				},
+			}}
+		c1 := x.getUDTransformerContainer(getContainerReq{
+			image: "main-image",
+		})
+		c2 := x.getUDTransformerContainer(getContainerReq{
+			image: "main-image",
+		})
+		assert.Equal(t, getKWArgs(c1), getKWArgs(c2))
+	})
+}
+
+func getKWArgs(container corev1.Container) string {
+	for _, a := range container.Args {
+		if strings.HasPrefix(a, "--kwargs=") {
+			return a
+		}
+	}
+	return ""
 }
diff --git a/pkg/apis/numaflow/v1alpha1/udf_test.go b/pkg/apis/numaflow/v1alpha1/udf_test.go
index 8a9b3e3e..7b61bfd7 100644
--- a/pkg/apis/numaflow/v1alpha1/udf_test.go
+++ b/pkg/apis/numaflow/v1alpha1/udf_test.go
@@ -94,4 +94,27 @@ func Test_getUDFContainer(t *testing.T) {
 		assert.Contains(t, envNames, "e")
 		assert.NotContains(t, envNames, "a")
 	})
+
+	t.Run("with built-in functions, with multiple KWArgs", func(t *testing.T) {
+		// This test verify when we have multiple KWArgs in map, after converting them to a single `--kwargs=a=x,b=y...` string, we maintain a consistent order.
+		x := UDF{
+			Builtin: &Function{
+				Name: "filter",
+				KWArgs: map[string]string{
+					"expression": "json(payload).a > 1",
+					"extra-arg1": "1",
+					"extra-arg2": "2",
+					"extra-arg3": "3",
+					"extra-arg4": "4",
+				},
+			},
+		}
+		c1 := x.getUDFContainer(getContainerReq{
+			image: "main-image",
+		})
+		c2 := x.getUDFContainer(getContainerReq{
+			image: "main-image",
+		})
+		assert.Equal(t, getKWArgs(c1), getKWArgs(c2))
+	})
 }
diff --git a/pkg/reconciler/pipeline/validate_test.go b/pkg/reconciler/pipeline/validate_test.go
index de5eed3c..9ed3bc01 100644
--- a/pkg/reconciler/pipeline/validate_test.go
+++ b/pkg/reconciler/pipeline/validate_test.go
@@ -38,8 +38,11 @@ var (
 		Spec: dfv1.PipelineSpec{
 			Vertices: []dfv1.AbstractVertex{
 				{
-					Name:   "input",
-					Source: &dfv1.Source{},
+					Name: "input",
+					Source: &dfv1.Source{
+						UDTransformer: &dfv1.UDTransformer{
+							Builtin: &dfv1.Transformer{Name: "filter"},
+						}},
 				},
 				{
 					Name: "p1",
@@ -219,19 +222,20 @@ func TestValidatePipeline(t *testing.T) {
 		assert.Contains(t, err.Error(), "only one of")
 	})
 
-	t.Run("source data transformer not properly specified", func(t *testing.T) {
+	t.Run("transformer no image and builtin specified", func(t *testing.T) {
 		testObj := testPipeline.DeepCopy()
-		testObj.Spec.Vertices[0].Source = &dfv1.Source{
-			HTTP: &dfv1.HTTPSource{},
-			UDTransformer: &dfv1.UDTransformer{
-				Container: &dfv1.Container{
-					Image: "",
-				},
-			},
-		}
+		testObj.Spec.Vertices[0].Source.UDTransformer.Builtin = nil
+		err := ValidatePipeline(testObj)
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "either specify a builtin transformer, or a customized image")
+	})
+
+	t.Run("transformer both image and builtin specified", func(t *testing.T) {
+		testObj := testPipeline.DeepCopy()
+		testObj.Spec.Vertices[0].Source.UDTransformer.Container = &dfv1.Container{Image: "xxxx"}
 		err := ValidatePipeline(testObj)
 		assert.Error(t, err)
-		assert.Contains(t, err.Error(), "can not specify an empty image")
+		assert.Contains(t, err.Error(), "can not specify both builtin transformer, and a customized image")
 	})
 
 	t.Run("udf no image and builtin specified", func(t *testing.T) {
diff --git a/pkg/shared/expr/eval_string_test.go b/pkg/shared/expr/eval_string_test.go
new file mode 100644
index 00000000..30347890
--- /dev/null
+++ b/pkg/shared/expr/eval_string_test.go
@@ -0,0 +1,49 @@
+/*
+Copyright 2022 The Numaproj Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package expr
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_eval_expression(t *testing.T) {
+	t.Run("test a simple evaluation case", func(t *testing.T) {
+		b, err := EvalStr(`json(payload).a`, []byte(`{"a": "b"}`))
+		assert.NoError(t, err)
+		assert.Equal(t, "b", b)
+	})
+
+	t.Run("test nested json evaluation case", func(t *testing.T) {
+		c, err := EvalStr(`json(payload).a.b`, []byte(`{"a": {"b": "c"}}`))
+		assert.NoError(t, err)
+		assert.Equal(t, "c", c)
+	})
+
+	t.Run("test nested json evaluation case, list of items", func(t *testing.T) {
+		time, err := EvalStr(`json(payload).item[1].time`, []byte(`{"test": 21, "item": [{"id": 1, "name": "numa", "time": "2021-02-18T21:54:42.123Z"},{"id": 2, "name": "numa", "time": "2021-02-18T21:54:42.123Z"}]}`))
+		assert.NoError(t, err)
+		assert.Equal(t, "2021-02-18T21:54:42.123Z", time)
+	})
+
+	t.Run("test invalid expression", func(t *testing.T) {
+		_, err := EvalStr(`ab\na`, []byte(`{"a": "b"}`))
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "unable to compile expression")
+	})
+}
diff --git a/pkg/sources/transformer/builtin/builtin_test.go b/pkg/sources/transformer/builtin/builtin_test.go
new file mode 100644
index 00000000..1f5e090a
--- /dev/null
+++ b/pkg/sources/transformer/builtin/builtin_test.go
@@ -0,0 +1,59 @@
+/*
+Copyright 2022 The Numaproj Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package builtin
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetExecutors(t *testing.T) {
+	t.Run("test good", func(t *testing.T) {
+		builtins := []Builtin{
+			{
+				Name: "eventTimeExtractor",
+				KWArgs: map[string]string{
+					"expression": "json(payload).item[1].time",
+					"format":     "2006-01-02T15:04:05Z07:00",
+				},
+			},
+			{
+				Name:   "filter",
+				KWArgs: map[string]string{"expression": `json(payload).a=="b"`},
+			},
+		}
+		for _, b := range builtins {
+			e, err := b.executor()
+			assert.NoError(t, err)
+			assert.NotNil(t, e)
+		}
+	})
+
+	t.Run("test bad", func(t *testing.T) {
+		b := &Builtin{
+			Name: "catt",
+		}
+		_, err := b.executor()
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "unrecognized transformer")
+	})
+}
+
+func Test_Start(t *testing.T) {
+	// TODO
+}
diff --git a/pkg/sources/transformer/builtin/event_time/event_time_extractor_test.go b/pkg/sources/transformer/builtin/event_time/event_time_extractor_test.go
new file mode 100644
index 00000000..0e382434
--- /dev/null
+++ b/pkg/sources/transformer/builtin/event_time/event_time_extractor_test.go
@@ -0,0 +1,115 @@
+/*
+Copyright 2022 The Numaproj Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package eventtime
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type testDatum struct {
+	value     []byte
+	eventTime time.Time
+	watermark time.Time
+}
+
+func (h *testDatum) Value() []byte {
+	return h.value
+}
+
+func (h *testDatum) EventTime() time.Time {
+	return h.eventTime
+}
+
+func (h *testDatum) Watermark() time.Time {
+	return h.watermark
+}
+
+func TestEventTimeExtractor(t *testing.T) {
+	t.Run("Missing expression, return error", func(t *testing.T) {
+		_, err := New(map[string]string{})
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "missing \"expression\"")
+	})
+
+	t.Run("Missing format, return error", func(t *testing.T) {
+		_, err := New(map[string]string{"expression": "json(payload).item[1].time"})
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "missing \"format\"")
+	})
+
+	t.Run("Json expression valid, assign a new event time to the message", func(t *testing.T) {
+		args := map[string]string{"expression": "json(payload).item[1].time", "format": time.RFC3339}
+		handle, err := New(args)
+		assert.NoError(t, err)
+
+		testJsonMsg := `{"test": 21, "item": [{"id": 1, "name": "numa", "time": "2022-02-18T21:54:42.123Z"},{"id": 2, "name": "numa", "time": "2021-02-18T21:54:42.123Z"}]}`
+		result := handle(context.Background(), "test-key", &testDatum{
+			value:     []byte(testJsonMsg),
+			eventTime: time.Time{},
+			watermark: time.Time{},
+		})
+
+		expected, _ := time.Parse(time.RFC3339, "2021-02-18T21:54:42.123Z")
+		// Verify new event time is assigned to the message.
+		assert.Equal(t, expected, result.Items()[0].EventTime)
+		// Verify the payload remains unchanged.
+		assert.Equal(t, testJsonMsg, string(result.Items()[0].Value))
+	})
+
+	t.Run("Cannot compile json expression, pass on the message", func(t *testing.T) {
+		args := map[string]string{"expression": "json(payload).item[1].non-exist-field-name", "format": time.RFC3339}
+		handle, err := New(args)
+		assert.NoError(t, err)
+
+		testInputEventTime := time.Date(2022, 1, 4, 2, 3, 4, 5, time.UTC)
+		testJsonMsg := `{"test": 21, "item": [{"id": 1, "name": "numa", "time": "2022-02-18T21:54:42.123Z"},{"id": 2, "name": "numa", "time": "2021-02-18T21:54:42.123Z"}]}`
+		result := handle(context.Background(), "test-key", &testDatum{
+			value:     []byte(testJsonMsg),
+			eventTime: testInputEventTime,
+			watermark: time.Time{},
+		})
+
+		// Verify event time remains unchanged.
+		assert.Equal(t, testInputEventTime, result.Items()[0].EventTime)
+		// Verify the payload remains unchanged.
+		assert.Equal(t, testJsonMsg, string(result.Items()[0].Value))
+	})
+
+	t.Run("Time string not matching user-provided format, pass on the message", func(t *testing.T) {
+		args := map[string]string{"expression": "json(payload).item[1].time", "format": time.ANSIC}
+		handle, err := New(args)
+		assert.NoError(t, err)
+
+		testInputEventTime := time.Date(2022, 1, 4, 2, 3, 4, 5, time.UTC)
+		// Handler receives format as time.ANSIC but in the message, we use time.RFC3339. Format is not matched.
+		testJsonMsg := `{"test": 21, "item": [{"id": 1, "name": "numa", "time": "2022-02-18T21:54:42.123Z"},{"id": 2, "name": "numa", "time": "2021-02-18T21:54:42.123Z"}]}`
+		result := handle(context.Background(), "test-key", &testDatum{
+			value:     []byte(testJsonMsg),
+			eventTime: testInputEventTime,
+			watermark: time.Time{},
+		})
+
+		// Verify event time remains unchanged.
+		assert.Equal(t, testInputEventTime, result.Items()[0].EventTime)
+		// Verify the payload remains unchanged.
+		assert.Equal(t, testJsonMsg, string(result.Items()[0].Value))
+	})
+}
diff --git a/pkg/sources/transformer/builtin/filter/filter_test.go b/pkg/sources/transformer/builtin/filter/filter_test.go
new file mode 100644
index 00000000..e1d18a61
--- /dev/null
+++ b/pkg/sources/transformer/builtin/filter/filter_test.go
@@ -0,0 +1,142 @@
+/*
+Copyright 2022 The Numaproj Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package filter
+
+import (
+	"context"
+	"encoding/base64"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var _key = ""
+var jsonMsg = `{"test": 21, "item": [{"id": 1, "name": "numa"},{"id": 2, "name": "numa"}]}`
+var strMsg = `welcome to numaflow`
+var base64Msg = base64.StdEncoding.EncodeToString([]byte(strMsg))
+
+type testDatum struct {
+	value     []byte
+	eventTime time.Time
+	watermark time.Time
+}
+
+func (h *testDatum) Value() []byte {
+	return h.value
+}
+
+func (h *testDatum) EventTime() time.Time {
+	return h.eventTime
+}
+
+func (h *testDatum) Watermark() time.Time {
+	return h.watermark
+}
+
+func TestExpression(t *testing.T) {
+	t.Run("missing expression", func(t *testing.T) {
+		_, err := New(map[string]string{})
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "missing")
+	})
+
+	t.Run("Json expression valid", func(t *testing.T) {
+		args := map[string]string{"expression": "int(json(payload).item[1].id) == 2"}
+
+		handle, err := New(args)
+		assert.NoError(t, err)
+
+		result := handle(context.Background(), _key, &testDatum{
+			value:     []byte(jsonMsg),
+			eventTime: time.Time{},
+			watermark: time.Time{},
+		})
+		assert.Equal(t, jsonMsg, string(result.Items()[0].Value))
+	})
+
+	t.Run("invalid expression", func(t *testing.T) {
+		args := map[string]string{"expression": "ab\nc"}
+
+		handle, err := New(args)
+		assert.NoError(t, err)
+
+		result := handle(context.Background(), _key, &testDatum{
+			value:     []byte(jsonMsg),
+			eventTime: time.Time{},
+			watermark: time.Time{},
+		})
+		assert.Equal(t, "", string(result.Items()[0].Value))
+	})
+
+	t.Run("Json expression invalid", func(t *testing.T) {
+		args := map[string]string{"expression": "int(json(payload).item[1].id) == 3"}
+
+		handle, err := New(args)
+		assert.NoError(t, err)
+
+		result := handle(context.Background(), _key, &testDatum{
+			value:     []byte(jsonMsg),
+			eventTime: time.Time{},
+			watermark: time.Time{},
+		})
+		assert.Equal(t, "", string(result.Items()[0].Value))
+	})
+
+	t.Run("String expression invalid", func(t *testing.T) {
+		args := map[string]string{"expression": "sprig.contains('hello', payload)"}
+
+		handle, err := New(args)
+		assert.NoError(t, err)
+
+		result := handle(context.Background(), _key, &testDatum{
+			value:     []byte(jsonMsg),
+			eventTime: time.Time{},
+			watermark: time.Time{},
+		})
+		assert.Equal(t, "", string(result.Items()[0].Value))
+	})
+
+	t.Run("base64 expression valid", func(t *testing.T) {
+		args := map[string]string{"expression": "sprig.contains('numaflow', sprig.b64dec(payload))"}
+
+		handle, err := New(args)
+		assert.NoError(t, err)
+
+		result := handle(context.Background(), _key, &testDatum{
+			value:     []byte(base64Msg),
+			eventTime: time.Time{},
+			watermark: time.Time{},
+		})
+		assert.Equal(t, base64Msg, string(result.Items()[0].Value))
+	})
+
+	t.Run("event time unchanged", func(t *testing.T) {
+		args := map[string]string{"expression": "sprig.contains('numaflow', sprig.b64dec(payload))"}
+
+		handle, err := New(args)
+		assert.NoError(t, err)
+
+		testEventTime := time.Date(2022, 01, 01, 01, 01, 01, 01, time.UTC)
+		result := handle(context.Background(), _key, &testDatum{
+			value:     []byte(base64Msg),
+			eventTime: testEventTime,
+			watermark: time.Time{},
+		})
+		assert.Equal(t, testEventTime, result.Items()[0].EventTime)
+	})
+}
diff --git a/pkg/udf/builtin/builtin_test.go b/pkg/udf/builtin/builtin_test.go
index 0b745531..57bb0119 100644
--- a/pkg/udf/builtin/builtin_test.go
+++ b/pkg/udf/builtin/builtin_test.go
@@ -51,5 +51,5 @@ func TestGetExecutors(t *testing.T) {
 }
 
 func Test_Start(t *testing.T) {
-
+	// TODO
 }
diff --git a/pkg/udf/builtin/filter/filter_test.go b/pkg/udf/builtin/filter/filter_test.go
index 10abe3e9..9e511a5e 100644
--- a/pkg/udf/builtin/filter/filter_test.go
+++ b/pkg/udf/builtin/filter/filter_test.go
@@ -26,7 +26,7 @@ import (
 )
 
 var _key = ""
-var jsonMsg = `{"test": 21, "item": [{"id": 1, "name": "bala"},{"id": 2, "name": "bala"}]}`
+var jsonMsg = `{"test": 21, "item": [{"id": 1, "name": "numa"},{"id": 2, "name": "numa"}]}`
 var strMsg = `welcome to numaflow`
 var base64Msg = base64.StdEncoding.EncodeToString([]byte(strMsg))
 
diff --git a/test/e2e/functional_test.go b/test/e2e/functional_test.go
index 3279e72b..56b52e17 100644
--- a/test/e2e/functional_test.go
+++ b/test/e2e/functional_test.go
@@ -21,6 +21,7 @@ package e2e
 import (
 	"context"
 	"fmt"
+	"strconv"
 	"testing"
 	"time"
 
@@ -102,12 +103,12 @@ func (s *FunctionalSuite) TestCreateSimplePipeline() {
 	assert.Equal(s.T(), pipelineName, *m.Pipeline)
 }
 
-func (s *FunctionalSuite) TestFiltering() {
-	w := s.Given().Pipeline("@testdata/filtering.yaml").
+func (s *FunctionalSuite) TestUDFFiltering() {
+	w := s.Given().Pipeline("@testdata/udf-filtering.yaml").
 		When().
 		CreatePipelineAndWait()
 	defer w.DeletePipelineAndWait()
-	pipelineName := "filtering"
+	pipelineName := "udf-filtering"
 
 	// wait for all the pods to come up
 	w.Expect().VertexPodsRunning()
@@ -131,6 +132,54 @@ func (s *FunctionalSuite) TestFiltering() {
 	w.Expect().SinkNotContains("out", expect2)
 }
 
+func (s *FunctionalSuite) TestSourceFiltering() {
+	w := s.Given().Pipeline("@testdata/source-filtering.yaml").
+		When().
+		CreatePipelineAndWait()
+	defer w.DeletePipelineAndWait()
+	pipelineName := "source-filtering"
+
+	// wait for all the pods to come up
+	w.Expect().VertexPodsRunning()
+
+	expect0 := `{"id": 180, "msg": "hello", "expect0": "fail", "desc": "A bad example"}`
+	expect1 := `{"id": 80, "msg": "hello1", "expect1": "fail", "desc": "A bad example"}`
+	expect2 := `{"id": 80, "msg": "hello", "expect2": "fail", "desc": "A bad example"}`
+	expect3 := `{"id": 80, "msg": "hello", "expect3": "succeed", "desc": "A good example"}`
+	expect4 := `{"id": 80, "msg": "hello", "expect4": "succeed", "desc": "A good example"}`
+
+	w.SendMessageTo(pipelineName, "in", NewHttpPostRequest().WithBody([]byte(expect0))).
+		SendMessageTo(pipelineName, "in", NewHttpPostRequest().WithBody([]byte(expect1))).
+		SendMessageTo(pipelineName, "in", NewHttpPostRequest().WithBody([]byte(expect2))).
+		SendMessageTo(pipelineName, "in", NewHttpPostRequest().WithBody([]byte(expect3))).
+		SendMessageTo(pipelineName, "in", NewHttpPostRequest().WithBody([]byte(expect4)))
+
+	w.Expect().SinkContains("out", expect3)
+	w.Expect().SinkContains("out", expect4)
+	w.Expect().SinkNotContains("out", expect0)
+	w.Expect().SinkNotContains("out", expect1)
+	w.Expect().SinkNotContains("out", expect2)
+}
+
+func (s *FunctionalSuite) TestBuiltinEventTimeExtractor() {
+	w := s.Given().Pipeline("@testdata/extract-event-time-from-payload.yaml").
+		When().
+		CreatePipelineAndWait()
+	defer w.DeletePipelineAndWait()
+	pipelineName := "extract-event-time"
+
+	// wait for all the pods to come up
+	w.Expect().VertexPodsRunning()
+
+	// In this test, we send a message with event time being now, apply event time extractor and verify from log that the message event time gets updated.
+	timeNow := strconv.FormatInt(time.Now().UnixMilli(), 10)
+	testMsg := `{"test": 21, "item": [{"id": 1, "name": "numa", "time": "2022-02-18T21:54:42.123Z"},{"id": 2, "name": "numa", "time": "2021-02-18T21:54:42.123Z"}]}`
+
+	w.SendMessageTo(pipelineName, "in", NewHttpPostRequest().WithBody([]byte(testMsg)).WithHeader("X-Numaflow-Event-Time", timeNow))
+
+	w.Expect().VertexPodLogContains("out", fmt.Sprintf("EventTime -  %d", time.Date(2021, 2, 18, 21, 54, 42, 123000000, time.UTC).UnixMilli()), PodLogCheckOptionWithCount(1))
+}
+
 func (s *FunctionalSuite) TestConditionalForwarding() {
 	w := s.Given().Pipeline("@testdata/even-odd.yaml").
 		When().
diff --git a/test/e2e/testdata/extract-event-time-from-payload.yaml b/test/e2e/testdata/extract-event-time-from-payload.yaml
new file mode 100644
index 00000000..2187ab50
--- /dev/null
+++ b/test/e2e/testdata/extract-event-time-from-payload.yaml
@@ -0,0 +1,23 @@
+apiVersion: numaflow.numaproj.io/v1alpha1
+kind: Pipeline
+metadata:
+  name: extract-event-time
+spec:
+  vertices:
+    - name: in
+      source:
+        http: {}
+        transformer:
+          builtin:
+            name: eventTimeExtractor
+            kwargs:
+              expression: json(payload).item[1].time
+              # Use RFC3339 time format for testing.
+              # More types of format in https://cs.opensource.google/go/go/+/refs/tags/go1.19.5:src/time/format.go
+              format: 2006-01-02T15:04:05Z07:00
+    - name: out
+      sink:
+        log: {}
+  edges:
+    - from: in
+      to: out
diff --git a/test/e2e/testdata/source-filtering.yaml b/test/e2e/testdata/source-filtering.yaml
new file mode 100644
index 00000000..62ff7768
--- /dev/null
+++ b/test/e2e/testdata/source-filtering.yaml
@@ -0,0 +1,22 @@
+apiVersion: numaflow.numaproj.io/v1alpha1
+kind: Pipeline
+metadata:
+  name: source-filtering
+spec:
+  vertices:
+    - name: in
+      source:
+        http: {}
+        transformer:
+          builtin:
+            name: filter
+            kwargs:
+              expression: int(json(payload).id) < 100 && json(payload).msg == 'hello' && sprig.contains('good', string(json(payload).desc))
+    - name: out
+      sink:
+        udsink:
+          container:
+            image: quay.io/numaio/numaflow-sink/redis-e2e-test-sink:latest
+  edges:
+    - from: in
+      to: out
diff --git a/test/e2e/testdata/filtering.yaml b/test/e2e/testdata/udf-filtering.yaml
similarity index 96%
rename from test/e2e/testdata/filtering.yaml
rename to test/e2e/testdata/udf-filtering.yaml
index 353ea421..3b1f3e0a 100644
--- a/test/e2e/testdata/filtering.yaml
+++ b/test/e2e/testdata/udf-filtering.yaml
@@ -1,7 +1,7 @@
 apiVersion: numaflow.numaproj.io/v1alpha1
 kind: Pipeline
 metadata:
-  name: filtering
+  name: udf-filtering
 spec:
   vertices:
     - name: in