Project: Apache Spark (App Definition and Development / Streaming & Messaging)
File: sql-ref-syntax-qry-explain.md

layout: global title: EXPLAIN displayTitle: EXPLAIN license: | Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You 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. The `EXPLAIN` statement is used to provide logical/physical plans for an input statement. By default, this clause provides information about a physical plan only. ```sql EXPLAIN [ EXTENDED | CODEGEN | COST | FORMATTED ] statement ``` EXTENDED* Generates parsed logical plan, analyzed logical plan, optimized logical plan and physical plan. Parsed Logical plan is a unresolved plan that extracted from the query. Analyzed logical plans transforms which translates unresolvedAttribute and unresolvedRelation into fully typed objects. The optimized logical plan transforms through a set of optimization rules, resulting in the physical plan. CODEGEN* Generates code for the statement, if any and a physical plan. COST* If plan node statistics are available, generates a logical plan and the statistics. FORMATTED* Generates two sections: a physical plan outline and node details. statement* Specifies a SQL statement to be explained. ```sql -- Default Output EXPLAIN select k, sum(v) from values (1, 2), (1, 3) t(k, v) group by k; +-+ | plan| +-+ | == Physical Plan == *(2) HashAggregate(keys=[k#33], functions=[sum(cast(v#34 as bigint))]) +- Exchange hashpartitioning(k#33, 200), true, [id=#59] +- *(1) HashAggregate(keys=[k#33], functions=[partial_sum(cast(v#34 as bigint))]) +- *(1) LocalTableScan [k#33, v#34] | +- -- Using Extended EXPLAIN EXTENDED select k, sum(v) from values (1, 2), (1, 3) t(k, v) group by k; +-+ | plan| +-+ | == Parsed Logical Plan == 'Aggregate ['k], ['k, unresolvedalias('sum('v), None)] +- 'SubqueryAlias `t` +- 'UnresolvedInlineTable [k, v], [List(1, 2), List(1, 3)] == Analyzed Logical Plan == k: int, sum(v): bigint Aggregate [k#47], [k#47, sum(cast(v#48 as bigint)) AS sum(v)#50L] +- SubqueryAlias `t` +- LocalRelation [k#47, v#48] == Optimized Logical Plan == Aggregate [k#47], [k#47, sum(cast(v#48 as bigint)) AS sum(v)#50L] +- LocalRelation [k#47, v#48] == Physical Plan == *(2) HashAggregate(keys=[k#47], functions=[sum(cast(v#48 as bigint))], output=[k#47, sum(v)#50L]) +- Exchange hashpartitioning(k#47, 200), true, [id=#79] +- *(1) HashAggregate(keys=[k#47], functions=[partial_sum(cast(v#48 as bigint))], output=[k#47, sum#52L]) +- *(1) LocalTableScan [k#47, v#48] | +-+ -- Using Formatted EXPLAIN FORMATTED select k, sum(v) from values (1, 2), (1, 3) t(k, v) group by k; +-+ | plan| +-+ | == Physical Plan == HashAggregate (4) +- Exchange (3) +- * HashAggregate (2) +- * LocalTableScan (1) (1) LocalTableScan [codegen id : 1] Output: [k#19, v#20] (2) HashAggregate [codegen id : 1] Input: [k#19, v#20] (3) Exchange Input: [k#19, sum#24L] (4) HashAggregate [codegen id : 2] Input: [k#19, sum#24L] | +-+ ```