ASF GitHub Bot commented on DRILL-6126:

Github user ppadma commented on the issue:

    @paul-rogers Thank you Paul. I will be incorporating some of your 
suggestions in future PRs. This change will allow us to build more things on 

> 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
>             Fix For: 1.12.0
> 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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