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https://issues.apache.org/jira/browse/SPARK-26316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16714367#comment-16714367
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Apache Spark commented on SPARK-26316:
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User 'JkSelf' has created a pull request for this issue:
https://github.com/apache/spark/pull/23269
> Because of the perf degradation in TPC-DS, we currently partial revert
> SPARK-21052：Add hash map metrics to join,
> ----------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-26316
> URL: https://issues.apache.org/jira/browse/SPARK-26316
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0, 2.3.1, 2.3.2, 2.4.0
> Reporter: Ke Jia
> Priority: Major
>
> The code of
> [L486|https://github.com/apache/spark/blob/1d3dd58d21400b5652b75af7e7e53aad85a31528/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala#L486]
> and
> [L487|https://github.com/apache/spark/blob/1d3dd58d21400b5652b75af7e7e53aad85a31528/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala#L487]
> in SPARK-21052 cause performance degradation in spark2.3. The result of
> all queries in TPC-DS with 1TB is in [TPC-DS
> result|https://docs.google.com/spreadsheets/d/18a5BdOlmm8euTaRodyeWum9yu92mbWWu6JbhGXtr7yE/edit#gid=0]
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