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Posted to issues@spark.apache.org by "Dongjoon Hyun (Jira)" <ji...@apache.org> on 2021/05/07 03:46:00 UTC
[jira] [Resolved] (SPARK-35133) EXPLAIN CODEGEN does not work with
AQE
[ https://issues.apache.org/jira/browse/SPARK-35133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dongjoon Hyun resolved SPARK-35133.
-----------------------------------
Fix Version/s: 3.2.0
Resolution: Fixed
Issue resolved by pull request 32430
[https://github.com/apache/spark/pull/32430]
> EXPLAIN CODEGEN does not work with AQE
> --------------------------------------
>
> Key: SPARK-35133
> URL: https://issues.apache.org/jira/browse/SPARK-35133
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Cheng Su
> Assignee: Cheng Su
> Priority: Major
> Fix For: 3.2.0
>
>
> `EXPLAIN CODEGEN <query>` (and Dataset.explain("codegen")) prints out the generated code for each stage of plan. The current implementation is to match `WholeStageCodegenExec` operator in query plan and prints out generated code ([https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/debug/package.scala#L111-L118] ). This does not work with AQE as we wrap the whole query plan inside `AdaptiveSparkPlanExec` and do not run whole stage code-gen physical plan rule eagerly (`CollapseCodegenStages`). This introduces unexpected behavior change for EXPLAIN query (and Dataset.explain), as we enable AQE by default now.
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