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https://issues.apache.org/jira/browse/SPARK-26375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16724827#comment-16724827
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Wang, Gang commented on SPARK-26375:
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Should be okay, filter on partition columns is also regarded as a normal
filter, and the output stats is measured in class FilterEstimation.
> Rule PruneFileSourcePartitions should be fired before any other rules based
> on table statistics
> -----------------------------------------------------------------------------------------------
>
> Key: SPARK-26375
> URL: https://issues.apache.org/jira/browse/SPARK-26375
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Wang, Gang
> Priority: Major
>
> In catalyst, some optimize rules are base on table statistics, like rule
> ReorderJoin, in which star schema is detected, and CostBasedJoinReorder. In
> these rules, statistics accuracy are crucial. While, currently all these
> rules are fired before partition pruning, which may result in inaccurate
> statistics.
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