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https://issues.apache.org/jira/browse/SPARK-13234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15141930#comment-15141930
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Apache Spark commented on SPARK-13234:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/11163
> Remove duplicated SQL metrics
> -----------------------------
>
> Key: SPARK-13234
> URL: https://issues.apache.org/jira/browse/SPARK-13234
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
>
> For lots of SQL operators, we have metrics for both of input and output, the
> number of input rows should be exactly the number of output rows of child, we
> could only have metrics for output rows.
> After we improve the performance using whole stage codegen, the overhead of
> SQL metrics are not trivial anymore, we should avoid that if it's not
> necessary.
> Some of the operator does not have SQL metrics, we should add that for them.
> For those operators that have the same number of rows from input and output
> (for example, Projection, we may don't need that).
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