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https://issues.apache.org/jira/browse/HIVE-22578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16991595#comment-16991595
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Aron Hamvas commented on HIVE-22578:
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[~vgarg], [~kgyrtkirk],
would you care to review this small change I am proposing? Thanks! :)
https://reviews.apache.org/r/71889/
> CBO genOPTree is not failsafe for CTAS and VIEW statements
> ----------------------------------------------------------
>
> Key: HIVE-22578
> URL: https://issues.apache.org/jira/browse/HIVE-22578
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 3.0.0, 3.1.2
> Reporter: Aron Hamvas
> Assignee: Aron Hamvas
> Priority: Major
> Fix For: 3.0.1, 4.0.0, 3.1.3
>
> Attachments: HIVE-22578.2.patch, HIVE-22578.patch
>
>
> If CBO fails during OT generation, it is supposed to skip CBO and fall back
> to SemanticAnalyzer generating the OT for the original AST. However, for CTAS
> and VIEW statements, the original AST is discarded and replaced with the new
> AST.
> If OT generation for the new AST fails with a SemanticException, the
> compilation is destined to fail completely since we cannot fall back to the
> original and possibly valid AST.
> Also, the SemanticException sometimes gets hidden and misjudged as a missing
> column statistics issue due to bad error handling.
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