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https://issues.apache.org/jira/browse/DRILL-6126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395700#comment-16395700
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Boaz Ben-Zvi commented on DRILL-6126:
-------------------------------------
Merged with commit ID - 31e0f29a6140a19eda8de615e615208f51f2cf96
> Allocate memory for value vectors upfront in flatten operator
> -------------------------------------------------------------
>
> Key: DRILL-6126
> URL: https://issues.apache.org/jira/browse/DRILL-6126
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: Padma Penumarthy
> Assignee: Padma Penumarthy
> Priority: Critical
> Labels: ready-to-commit
> Fix For: 1.13.0
>
>
> With recent changes to control batch size for flatten operator, we figure out
> row count in the output batch based on memory. Since we know how many rows we
> are going to include in the batch, we can also allocate the memory needed
> upfront instead of starting with initial value (4096) and doubling, copying
> every time we need more.
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