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https://issues.apache.org/jira/browse/SPARK-32704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17196613#comment-17196613
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Apache Spark commented on SPARK-32704:
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User 'HyukjinKwon' has created a pull request for this issue:
https://github.com/apache/spark/pull/29766
> Logging plan changes for execution
> ----------------------------------
>
> Key: SPARK-32704
> URL: https://issues.apache.org/jira/browse/SPARK-32704
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Takeshi Yamamuro
> Assignee: Takeshi Yamamuro
> Priority: Minor
> Fix For: 3.1.0
>
>
> Since we only log plan changes for analyzer/optimizer now, this ticket
> targets adding code to log plan changes in the preparation phase in
> QueryExecution for execution.
> {code}
> scala> spark.sql("SET spark.sql.optimizer.planChangeLog.level=WARN")
> scala> spark.range(10).groupBy("id").count().queryExecution.executedPlan
> ...
> 20/08/26 09:32:36 WARN PlanChangeLogger:
> === Applying Rule org.apache.spark.sql.execution.CollapseCodegenStages ===
> !HashAggregate(keys=[id#19L], functions=[count(1)], output=[id#19L,
> count#23L]) *(1) HashAggregate(keys=[id#19L],
> functions=[count(1)], output=[id#19L, count#23L])
> !+- HashAggregate(keys=[id#19L], functions=[partial_count(1)],
> output=[id#19L, count#27L]) +- *(1) HashAggregate(keys=[id#19L],
> functions=[partial_count(1)], output=[id#19L, count#27L])
> ! +- Range (0, 10, step=1, splits=4)
> +- *(1) Range (0, 10, step=1, splits=4)
>
> 20/08/26 09:32:36 WARN PlanChangeLogger:
> === Result of Batch Preparations ===
> !HashAggregate(keys=[id#19L], functions=[count(1)], output=[id#19L,
> count#23L]) *(1) HashAggregate(keys=[id#19L],
> functions=[count(1)], output=[id#19L, count#23L])
> !+- HashAggregate(keys=[id#19L], functions=[partial_count(1)],
> output=[id#19L, count#27L]) +- *(1) HashAggregate(keys=[id#19L],
> functions=[partial_count(1)], output=[id#19L, count#27L])
> ! +- Range (0, 10, step=1, splits=4)
> {code}
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