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https://issues.apache.org/jira/browse/SPARK-19271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15827588#comment-15827588
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Apache Spark commented on SPARK-19271:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/16631
> Change non-cbo estimation of aggregate
> --------------------------------------
>
> Key: SPARK-19271
> URL: https://issues.apache.org/jira/browse/SPARK-19271
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Zhenhua Wang
>
> Change non-cbo estimation behavior of aggregate:
> If groupExpression is empty, we can know row count (=1) and the corresponding
> size;
> otherwise, estimation falls back to UnaryNode's computeStats method, which
> should not propagate rowCount and attributeStats in Statistics because they
> are not estimated in that method.
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