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https://issues.apache.org/jira/browse/HIVE-20985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16705651#comment-16705651
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Gopal V commented on HIVE-20985:
--------------------------------
This doesn't look to be a significant performance issue, however there's no
comments to actually describe what it ends up doing when it does
{code}
+ for (int i = 0; i < markedScratchColumns.length; i++) {
+ if (markedScratchColumns[i]) {
+ scratchColumnTrackWasUsed[i] = false;
+ }
+ }
{code}
The vectorizer state push/pop is not entirely clear, at least from a quick read.
> If select operator inputs are temporary columns vectorization may reuse some
> of them as output
> ----------------------------------------------------------------------------------------------
>
> Key: HIVE-20985
> URL: https://issues.apache.org/jira/browse/HIVE-20985
> Project: Hive
> Issue Type: Bug
> Components: Vectorization
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Attachments: HIVE-20985.01.patch, HIVE-20985.02.patch,
> HIVE-20985.03.patch, HIVE-20985.03.patch, HIVE-20985.04.patch
>
>
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