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https://issues.apache.org/jira/browse/HIVE-8313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14191124#comment-14191124
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Mithun Radhakrishnan commented on HIVE-8313:
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Hello, [~navis]. Thanks for reviewing. (Apologies for getting to this so late.)
I suppose I could change {{childrenNeedingPrepare}} to an array, but the size
wouldn't be known until the end of {{initialize()}}. Would you recommend that I
create a temp-list and convert that to an array?
> Optimize evaluation for ExprNodeConstantEvaluator and ExprNodeNullEvaluator
> ---------------------------------------------------------------------------
>
> Key: HIVE-8313
> URL: https://issues.apache.org/jira/browse/HIVE-8313
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.12.0, 0.13.0, 0.14.0
> Reporter: Mithun Radhakrishnan
> Assignee: Mithun Radhakrishnan
> Attachments: HIVE-8313.1.patch
>
>
> Consider the following query:
> {code:sql}
> SELECT foo, bar, goo, id
> FROM myTable
> WHERE id IN ( 'A', 'B', 'C', 'D', ... , 'ZZZZZZ' );
> {code}
> One finds that when the IN clause has several thousand elements (and the
> table has several million rows), the query above takes orders-of-magnitude
> longer to run on Hive 0.12 than say Hive 0.10.
> I have a possibly incomplete fix.
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