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https://issues.apache.org/jira/browse/HIVE-11281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14630562#comment-14630562
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Eugene Koifman commented on HIVE-11281:
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UpdateDeleteSemanticAnalyzer does mutate AST. There may be others, but even if
we currently didn't modify AST this change could created very subtle bugs
(especially when trying to debug something based on logs)
> Memoize toStringTree() for ASTNode
> ----------------------------------
>
> Key: HIVE-11281
> URL: https://issues.apache.org/jira/browse/HIVE-11281
> Project: Hive
> Issue Type: Bug
> Components: Query Planning
> Affects Versions: 1.0.0, 1.2.0, 1.1.0
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
> Attachments: HIVE-11281.2.patch, HIVE-11281.3.patch, HIVE-11281.patch
>
>
> Currently it defaults to BaseTree::toStringTree() which always computes it
> recursively. For very large trees it becomes expensive. On one particular
> test query compilation time went down from 55 seconds to 2 seconds.
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