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https://issues.apache.org/jira/browse/HIVE-16934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16058245#comment-16058245
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Vineet Garg commented on HIVE-16934:
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Hi [~jcamachorodriguez], why do we do this rewrite? In what way rewriting
count(a) to count(*) benefits?
> Transform COUNT(x) into COUNT() when x is not nullable
> ------------------------------------------------------
>
> Key: HIVE-16934
> URL: https://issues.apache.org/jira/browse/HIVE-16934
> Project: Hive
> Issue Type: Improvement
> Components: Logical Optimizer
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-16934.patch
>
>
> Add a rule to simplify COUNT aggregation function if possible, removing
> expressions that cannot be nullable from its parameters.
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