Repository: VictoriaMetrics/VictoriaMetrics
Pull request #3205 (2022-10-06 11:21:34)

docs: when modifying docs in place allow storing backups
The stored backups would help to identify docs corruption but aren't needed for commiting. So `.tmp` backup files are also git-ignored.

Signed-off-by: hagen1778 <roman@victoriametrics.com>

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Base: **57.68**% // Head: **57.59**% // Decreases project coverage by **`-0.08%`** :warning:
> Coverage data is based on head [(`0606684`)](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/pull/3205?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics) compared to base [(`ec04fca`)](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/commit/ec04fcac938245e003477e1ab37da2bf070e124c?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics).
> Patch has no changes to coverable lines.

<details><summary>Additional details and impacted files</summary>


```diff
@@            Coverage Diff             @@
##           master    #3205      +/-   ##
==========================================
- Coverage   57.68%   57.59%   -0.09%     
==========================================
  Files         285      285              
  Lines       48304    48304              
==========================================
- Hits        27862    27820      -42     
- Misses      18642    18689      +47     
+ Partials     1800     1795       -5     
```


| [Impacted Files](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/pull/3205?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics) | Coverage Δ | |
|---|---|---|
| [lib/mergeset/block\_stream\_reader.go](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/pull/3205/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics#diff-bGliL21lcmdlc2V0L2Jsb2NrX3N0cmVhbV9yZWFkZXIuZ28=) | `54.67% <0.00%> (-11.22%)` | :arrow_down: |
| [lib/mergeset/table.go](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/pull/3205/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics#diff-bGliL21lcmdlc2V0L3RhYmxlLmdv) | `65.18% <0.00%> (-2.33%)` | :arrow_down: |
| [lib/bloomfilter/filter.go](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/pull/3205/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics#diff-bGliL2Jsb29tZmlsdGVyL2ZpbHRlci5nbw==) | `98.00% <0.00%> (-2.00%)` | :arrow_down: |
| [app/vmalert/remotewrite/remotewrite.go](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/pull/3205/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics#diff-YXBwL3ZtYWxlcnQvcmVtb3Rld3JpdGUvcmVtb3Rld3JpdGUuZ28=) | `65.10% <0.00%> (-1.35%)` | :arrow_down: |
| [lib/storage/storage.go](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/pull/3205/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics#diff-bGliL3N0b3JhZ2Uvc3RvcmFnZS5nbw==) | `70.00% <0.00%> (+0.28%)` | :arrow_up: |
| [app/vmselect/promql/aggr\_incremental.go](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/pull/3205/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics#diff-YXBwL3Ztc2VsZWN0L3Byb21xbC9hZ2dyX2luY3JlbWVudGFsLmdv) | `87.68% <0.00%> (+1.20%)` | :arrow_up: |

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</details>

[:umbrella: View full report at Codecov](https://codecov.io/gh/VictoriaMetrics/VictoriaMetrics/pull/3205?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics).   
:loudspeaker: Do you have feedback about the report comment? [Let us know in this issue](https://about.codecov.io/codecov-pr-comment-feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VictoriaMetrics).


Patch:
diff --git a/.gitignore b/.gitignore
index 9aa07d068..5d6c51631 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,4 +19,5 @@
 .DS_store
 Gemfile.lock
 /_site
-_site
\ No newline at end of file
+_site
+*.tmp
\ No newline at end of file
diff --git a/Makefile b/Makefile
index a821b9f39..036281a04 100644
--- a/Makefile
+++ b/Makefile
@@ -402,7 +402,7 @@ copy-docs:
 		echo "---\nsort: ${ORDER}\n---\n" > ${DST}; \
 	fi
 	cat ${SRC} >> ${DST}
-	sed -i 's/<img src=\"docs\//<img src=\"/' ${DST}
+	sed -i '.tmp' 's/<img src=\"docs\//<img src=\"/' ${DST}
 
 # Copies docs for all components and adds the order tag.
 # For ORDER=0 it adds no order tag.
diff --git a/app/vmalert/README.md b/app/vmalert/README.md
index 9402dfa43..07826377c 100644
--- a/app/vmalert/README.md
+++ b/app/vmalert/README.md
@@ -332,9 +332,8 @@ groups:
 ```
 
 The results of alerting and recording rules contain `vm_account_id` and `vm_project_id` labels
-if `-clusterMode` is enabled. These labels can be used during [templating](https://docs.victoriametrics.com/vmalert.html#templating).
-The results of alerting and recording rules with these labels can be stored to the corresponding tenants at VictoriaMetrics cluster
-via [multitenant endpoint](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multitenancy-via-labels).
+if `-clusterMode` is enabled. These labels can be used during [templating](https://docs.victoriametrics.com/vmalert.html#templating),
+and help to identify to which account or project the triggered alert or produced recording belongs.
 
 If `-clusterMode` is enabled, then `-datasource.url`, `-remoteRead.url` and `-remoteWrite.url` must
 contain only the hostname without tenant id. For example: `-datasource.url=http://vmselect:8481`.
diff --git a/app/vmselect/prometheus/export.qtpl b/app/vmselect/prometheus/export.qtpl
index bc738ca31..9925edd72 100644
--- a/app/vmselect/prometheus/export.qtpl
+++ b/app/vmselect/prometheus/export.qtpl
@@ -162,13 +162,15 @@
 {% func convertValueToSpecialJSON(v float64) %}
 	{% if math.IsNaN(v) %}
 		null
-	{% elseif math.IsInf(v, 1) %}
-		"Infinity"
-	{% elseif math.IsInf(v, -1) %}
-		"-Infinity"
+	{% elseif math.IsInf(v, 0) %}
+		{% if v > 0 %}
+			"Infinity"
+		{% else %}
+			"-Infinity"
+		{% endif %}
 	{% else %}
 		{%f= v %}
 	{% endif %}
 {% endfunc %}
-{% endstripspace %}
 
+{% endstripspace %}
diff --git a/app/vmselect/prometheus/export.qtpl.go b/app/vmselect/prometheus/export.qtpl.go
index 56f211469..47fe8561a 100644
--- a/app/vmselect/prometheus/export.qtpl.go
+++ b/app/vmselect/prometheus/export.qtpl.go
@@ -547,51 +547,55 @@ func prometheusMetricName(mn *storage.MetricName) string {
 //line app/vmselect/prometheus/export.qtpl:160
 }
 
-//line app/vmselect/prometheus/export.qtpl:187
+//line app/vmselect/prometheus/export.qtpl:162
 func streamconvertValueToSpecialJSON(qw422016 *qt422016.Writer, v float64) {
-//line app/vmselect/prometheus/export.qtpl:188
+//line app/vmselect/prometheus/export.qtpl:163
 	if math.IsNaN(v) {
-//line app/vmselect/prometheus/export.qtpl:188
-		qw422016.N().S(`"NaN"`)
-//line app/vmselect/prometheus/export.qtpl:190
-	} else if math.IsInf(v, 1) {
-//line app/vmselect/prometheus/export.qtpl:190
-		qw422016.N().S(`"Infinity"`)
-//line app/vmselect/prometheus/export.qtpl:192
-	} else if math.IsInf(v, -1) {
-//line app/vmselect/prometheus/export.qtpl:192
-		qw422016.N().S(`"-Infinity"`)
-//line app/vmselect/prometheus/export.qtpl:194
+//line app/vmselect/prometheus/export.qtpl:163
+		qw422016.N().S(`null`)
+//line app/vmselect/prometheus/export.qtpl:165
+	} else if math.IsInf(v, 0) {
+//line app/vmselect/prometheus/export.qtpl:166
+		if v > 0 {
+//line app/vmselect/prometheus/export.qtpl:166
+			qw422016.N().S(`"Infinity"`)
+//line app/vmselect/prometheus/export.qtpl:168
+		} else {
+//line app/vmselect/prometheus/export.qtpl:168
+			qw422016.N().S(`"-Infinity"`)
+//line app/vmselect/prometheus/export.qtpl:170
+		}
+//line app/vmselect/prometheus/export.qtpl:171
 	} else {
-//line app/vmselect/prometheus/export.qtpl:195
+//line app/vmselect/prometheus/export.qtpl:172
 		qw422016.N().F(v)
-//line app/vmselect/prometheus/export.qtpl:196
+//line app/vmselect/prometheus/export.qtpl:173
 	}
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 }
 
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 func writeconvertValueToSpecialJSON(qq422016 qtio422016.Writer, v float64) {
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 	qw422016 := qt422016.AcquireWriter(qq422016)
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 	streamconvertValueToSpecialJSON(qw422016, v)
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 	qt422016.ReleaseWriter(qw422016)
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 }
 
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 func convertValueToSpecialJSON(v float64) string {
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 	qb422016 := qt422016.AcquireByteBuffer()
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 	writeconvertValueToSpecialJSON(qb422016, v)
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 	qs422016 := string(qb422016.B)
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 	qt422016.ReleaseByteBuffer(qb422016)
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 	return qs422016
-//line app/vmselect/prometheus/export.qtpl:197
+//line app/vmselect/prometheus/export.qtpl:174
 }
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 0ad843a58..bd51bd6bd 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -35,7 +35,6 @@ See [these docs](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#m
 * FEATURE: atomically delete directories with snapshots, parts and partitions at [storage level](https://docs.victoriametrics.com/#storage). Previously such directories can be left in partially deleted state when the deletion operation was interrupted by unclean shutdown. This may result in `cannot open file ...: no such file or directory` error on the next start. The probability of this error was quite high when NFS or EFS was used as persistent storage for VictoriaMetrics data. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3038).
 * FEATURE: set the `start` arg to `end - 5 minutes` if isn't passed explicitly to [/api/v1/labels](https://docs.victoriametrics.com/url-examples.html#apiv1labels) and [/api/v1/label/.../values](https://docs.victoriametrics.com/url-examples.html#apiv1labelvalues). See [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/3052).
 * FEATURE: allow to define the minimum TLS version to use when accepting https requests to VictoriaMetrics components if `-tls` command-line flag is set. The minimum TLS version can be set via `-tlsMinVersion` command-line flag. See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3090).
-* FEATURE: properly parse json when export import metrics via `api/v1/export` and `api/v1/import` API. Added support of the `["Infinity", "-Infinity", "NaN", null]` values. See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3161).
 * FEATURE: [vmctl](https://docs.victoriametrics.com/vmctl.html): add `vm-native-step-interval` command line flag for `vm-native` mode. New option allows splitting the import process into chunks by time interval. This helps migrating data sets with high churn rate and provides better control over the process. See [feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2733).
 * FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): add `top queries` tab, which shows various stats for recently executed queries. See [these docs](https://docs.victoriametrics.com/#top-queries) and [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2707).
 * FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): move the "Execute Query" and "Add Query" buttons below the query fields, change icon for remove query. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3101).
@@ -58,6 +57,7 @@ See [these docs](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#m
 * FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): allow specifying per-`-remoteWrite.url` limits for on-disk size for pending data via `-remoteWrite.maxDiskUsagePerURL` command-line flag. Thanks to @rbizos for [the pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/3071).
 
 * BUGFIX: do not export stale metrics via [/federate api](https://docs.victoriametrics.com/#federation) after the staleness markers. Previously such metrics were exported with `NaN` values. this could break some setups. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3185).
+* BUGFIX: export ininity numbers as `"Infinity"` strings at [/api/v1/export](https://docs.victoriametrics.com/#how-to-export-data-in-json-line-format), so they can be parsed by standard JSON parsers. Previously infinity numbers were exported as `Inf` values, which couldn't be parsed by standard JSON parsers. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3161).
 * BUGFIX: [vmauth](https://docs.victoriametrics.com/vmauth.html): properly handle request paths ending with `/` such as `/vmui/`. Previously `vmui` was dropping the traling `/`, which could prevent from using `vmui` via `vmauth`. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1752).
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): properly encode query params for aws signed requests, use `%20` instead of `+` as api requires. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3171).
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): properly parse relabel config when regex ending with escaped `$`. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3131).
diff --git a/docs/vmalert.md b/docs/vmalert.md
index 40a3be06e..029d03982 100644
--- a/docs/vmalert.md
+++ b/docs/vmalert.md
@@ -336,9 +336,8 @@ groups:
 ```
 
 The results of alerting and recording rules contain `vm_account_id` and `vm_project_id` labels
-if `-clusterMode` is enabled. These labels can be used during [templating](https://docs.victoriametrics.com/vmalert.html#templating).
-The results of alerting and recording rules with these labels can be stored to the corresponding tenants at VictoriaMetrics cluster
-via [multitenant endpoint](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multitenancy-via-labels).
+if `-clusterMode` is enabled. These labels can be used during [templating](https://docs.victoriametrics.com/vmalert.html#templating),
+and help to identify to which account or project the triggered alert or produced recording belongs.
 
 If `-clusterMode` is enabled, then `-datasource.url`, `-remoteRead.url` and `-remoteWrite.url` must
 contain only the hostname without tenant id. For example: `-datasource.url=http://vmselect:8481`.
diff --git a/lib/protoparser/vmimport/parser.go b/lib/protoparser/vmimport/parser.go
index 715299ac1..4111d8fb4 100644
--- a/lib/protoparser/vmimport/parser.go
+++ b/lib/protoparser/vmimport/parser.go
@@ -3,9 +3,9 @@ package vmimport
 import (
 	"fmt"
 	"math"
-	"strconv"
 	"strings"
 
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
 	"github.com/VictoriaMetrics/metrics"
 	"github.com/valyala/fastjson"
@@ -79,9 +79,13 @@ func (r *Row) unmarshal(s string, tu *tagsUnmarshaler) error {
 		return fmt.Errorf("missing `values` array")
 	}
 	for i, v := range values {
-		f, err := getFloat64(v)
+		f, err := v.Float64()
 		if err != nil {
-			return fmt.Errorf("cannot unmarshal value at position %d: %w", i, err)
+			// Fall back to parsing special values
+			f, err = getSpecialFloat64(v)
+			if err != nil {
+				return fmt.Errorf("cannot unmarshal value at position %d: %w", i, err)
+			}
 		}
 		r.Values = append(r.Values, f)
 	}
@@ -105,36 +109,40 @@ func (r *Row) unmarshal(s string, tu *tagsUnmarshaler) error {
 	return nil
 }
 
-func getFloat64(value *fastjson.Value) (float64, error) {
-	if value == nil {
-		return 0, fmt.Errorf("value is empty")
-	}
+var nan = math.NaN()
 
-	switch value.Type() {
+func getSpecialFloat64(v *fastjson.Value) (float64, error) {
+	vt := v.Type()
+	switch vt {
 	case fastjson.TypeNull:
-		return math.NaN(), nil
+		return nan, nil
 	case fastjson.TypeString:
-		return getSpecialFloat64ValueFromString(value.String())
+		b, _ := v.StringBytes()
+		s := bytesutil.ToUnsafeString(b)
+		return getSpecialFloat64FromString(s)
 	default:
-		return value.Float64()
+		return 0, fmt.Errorf("unsupported value type: %s; value=%q", vt, v)
 	}
 }
 
-func getSpecialFloat64ValueFromString(strVal string) (float64, error) {
-	str, err := strconv.Unquote(strings.ToLower(strVal))
-	if err != nil {
-		return 0, err
-	}
+var inf = math.Inf(1)
 
-	switch str {
-	case "infinity":
-		return math.Inf(1), nil
-	case "-infinity":
-		return math.Inf(-1), nil
-	case "null":
-		return math.NaN(), nil
+func getSpecialFloat64FromString(s string) (float64, error) {
+	minus := false
+	if strings.HasPrefix(s, "-") {
+		minus = true
+		s = s[1:]
+	}
+	switch s {
+	case "infinity", "Infinity", "Inf", "inf":
+		if minus {
+			return -inf, nil
+		}
+		return inf, nil
+	case "null", "Null", "nan", "NaN":
+		return nan, nil
 	default:
-		return 0, fmt.Errorf("got unsupported string: %q", str)
+		return 0, fmt.Errorf("unsupported string: %q", s)
 	}
 }
 


Test patch:
diff --git a/lib/protoparser/vmimport/parser_test.go b/lib/protoparser/vmimport/parser_test.go
index 28d6d4510..d37af11b0 100644
--- a/lib/protoparser/vmimport/parser_test.go
+++ b/lib/protoparser/vmimport/parser_test.go
@@ -1,6 +1,7 @@
 package vmimport
 
 import (
+	"fmt"
 	"math"
 	"reflect"
 	"testing"
@@ -49,7 +50,8 @@ func TestRowsUnmarshalFailure(t *testing.T) {
 	f(`{"metric":{"foo":"bar"},"values":["foo"],"timestamps":[3]}`)
 	f(`{"metric":{"foo":"bar"},"values":null,"timestamps":[3,4]}`)
 	f(`{"metric":{"foo":"bar"},"values":"null","timestamps":[3,4]}`)
-	f(`{"metric":{"foo":"bar"},"values":["NaN"],"timestamps":[3,4]}`)
+	f(`{"metric":{"foo":"bar"},"values":"NaN","timestamps":[3,4]}`)
+	f(`{"metric":{"foo":"bar"},"values":[["NaN"]],"timestamps":[3,4]}`)
 
 	// Invalid timestamps
 	f(`{"metric":{"foo":"bar"},"values":[1,2],"timestamps":3}`)
@@ -75,22 +77,14 @@ func TestRowsUnmarshalSuccess(t *testing.T) {
 		var rows Rows
 		rows.Unmarshal(s)
 
-		if containsNaN(rows) {
-			if !checkNaN(rows, rowsExpected) {
-				t.Fatalf("unexpected rows;\ngot\n%+v;\nwant\n%+v", rows.Rows, rowsExpected.Rows)
-				return
-			}
-			return
-		}
-
-		if !reflect.DeepEqual(rows.Rows, rowsExpected.Rows) {
-			t.Fatalf("unexpected rows;\ngot\n%+v;\nwant\n%+v", rows.Rows, rowsExpected.Rows)
+		if err := compareRows(&rows, rowsExpected); err != nil {
+			t.Fatalf("unexpected rows: %s;\ngot\n%+v;\nwant\n%+v", err, rows.Rows, rowsExpected.Rows)
 		}
 
 		// Try unmarshaling again
 		rows.Unmarshal(s)
-		if !reflect.DeepEqual(rows.Rows, rowsExpected.Rows) {
-			t.Fatalf("unexpected rows;\ngot\n%+v;\nwant\n%+v", rows.Rows, rowsExpected.Rows)
+		if err := compareRows(&rows, rowsExpected); err != nil {
+			t.Fatalf("unexpected rows at second unmarshal: %s;\ngot\n%+v;\nwant\n%+v", err, rows.Rows, rowsExpected.Rows)
 		}
 
 		rows.Reset()
@@ -117,14 +111,14 @@ func TestRowsUnmarshalSuccess(t *testing.T) {
 	})
 
 	// Inf and nan, null values
-	f(`{"metric":{"foo":"bar"},"values":[Inf, -Inf, "Infinity", "-Infinity", NaN, null, "null"],"timestamps":[456, 789, 123, 0, 1, 2, 3]}`, &Rows{
+	f(`{"metric":{"foo":"bar"},"values":[Inf, -Inf, "Infinity", "-Infinity", NaN, "NaN", null, "null", 1.2],"timestamps":[456, 789, 123, 0, 1, 42, 2, 3, 7]}`, &Rows{
 		Rows: []Row{{
 			Tags: []Tag{{
 				Key:   []byte("foo"),
 				Value: []byte("bar"),
 			}},
-			Values:     []float64{math.Inf(1), math.Inf(-1), math.Inf(1), math.Inf(-1), math.NaN(), math.NaN(), math.NaN()},
-			Timestamps: []int64{456, 789, 123, 0, 1, 2, 3},
+			Values:     []float64{inf, -inf, inf, -inf, nan, nan, nan, nan, 1.2},
+			Timestamps: []int64{456, 789, 123, 0, 1, 42, 2, 3, 7},
 		}},
 	})
 
@@ -242,56 +236,45 @@ garbage here
 	})
 }
 
-func Test_getFloat64FromStringValue(t *testing.T) {
-	f := func(name, strVal string, want float64, wantErr bool) {
-		t.Run(name, func(t *testing.T) {
-			got, err := getSpecialFloat64ValueFromString(strVal)
-			if (err != nil) != wantErr {
-				t.Errorf("getSpecialFloat64ValueFromString() error = %v, wantErr %v", err, wantErr)
-				return
-			}
-
-			if math.IsNaN(want) {
-				if !math.IsNaN(got) {
-					t.Fatalf("unexpected result; got %v; want %v", got, want)
-					return
-				}
-				return
-			}
-
-			if got != want {
-				t.Errorf("getSpecialFloat64ValueFromString() got = %v, want %v", got, want)
-			}
-		})
+func compareRows(rows, rowsExpected *Rows) error {
+	if len(rows.Rows) != len(rowsExpected.Rows) {
+		return fmt.Errorf("unexpected number of rows; got %d; want %d", len(rows.Rows), len(rowsExpected.Rows))
 	}
-
-	f("empty string", "", 0, true)
-	f("unsupported string", "1", 0, true)
-	f("null string", "null", 0, true)
-	f("infinity string", "\"Infinity\"", math.Inf(1), false)
-	f("-infinity string", "\"-Infinity\"", math.Inf(-1), false)
-	f("null string", "\"null\"", math.NaN(), false)
+	for i, row := range rows.Rows {
+		rowExpected := rowsExpected.Rows[i]
+		if err := compareSingleRow(&row, &rowExpected); err != nil {
+			return fmt.Errorf("unexpected row at position #%d: %w", i, err)
+		}
+	}
+	return nil
 }
 
-func containsNaN(rows Rows) bool {
-	for _, row := range rows.Rows {
-		for _, f := range row.Values {
-			if math.IsNaN(f) {
-				return true
-			}
-		}
+func compareSingleRow(row, rowExpected *Row) error {
+	if !reflect.DeepEqual(row.Tags, rowExpected.Tags) {
+		return fmt.Errorf("unexpected tags; got %q; want %q", row.Tags, rowExpected.Tags)
 	}
-	return false
+	if !reflect.DeepEqual(row.Timestamps, rowExpected.Timestamps) {
+		return fmt.Errorf("unexpected timestamps; got %d; want %d", row.Timestamps, rowExpected.Timestamps)
+	}
+	if err := compareValues(row.Values, rowExpected.Values); err != nil {
+		return fmt.Errorf("unexpected values; got %v; want %v", row.Values, rowExpected.Values)
+	}
+	return nil
 }
 
-func checkNaN(rows Rows, expectedRows *Rows) bool {
-	for i, row := range rows.Rows {
-		r := expectedRows.Rows[i]
-		for j, f := range row.Values {
-			if math.IsNaN(f) && math.IsNaN(r.Values[j]) {
-				return true
+func compareValues(values, valuesExpected []float64) error {
+	if len(values) != len(valuesExpected) {
+		return fmt.Errorf("unexpected number of values; got %d; want %d", len(values), len(valuesExpected))
+	}
+	for i, v := range values {
+		vExpected := valuesExpected[i]
+		if math.IsNaN(v) {
+			if !math.IsNaN(vExpected) {
+				return fmt.Errorf("expecting NaN at position #%d; got %v", i, v)
 			}
+		} else if v != vExpected {
+			return fmt.Errorf("unepxected value at position #%d; got %v; want %v", i, v, vExpected)
 		}
 	}
-	return false
+	return nil
 }