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https://issues.apache.org/jira/browse/HIVE-12356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15014712#comment-15014712
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Laljo John Pullokkaran commented on HIVE-12356:
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Yes, this is to reduce Hive Compilation cost.
> Capture if a rule mutated the plan.
> -----------------------------------
>
> Key: HIVE-12356
> URL: https://issues.apache.org/jira/browse/HIVE-12356
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Laljo John Pullokkaran
> Assignee: Laljo John Pullokkaran
>
> Currently Hive Optimizer doesn't capture if a rule mutated the plan.
> This info could be useful in:
> 1. determining if a subsequent optimization rule needs to be run or not
> (Ex if Constant propagation didn't mutate plan, then don't run subsequent
> PPD)
> 2. Explain can contain info about which optimizations are applied effectively
> on the query.
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