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https://issues.apache.org/jira/browse/DRILL-5688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388975#comment-16388975
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Pritesh Maker commented on DRILL-5688:
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[~Paul.Rogers] since the PR was closed, should we close the Jira as well?

> Add repeated map support to column accessors
> --------------------------------------------
>
>                 Key: DRILL-5688
>                 URL: https://issues.apache.org/jira/browse/DRILL-5688
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.12.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>            Priority: Major
>
> DRILL-5211 describes how Drill runs into OOM issues due to Drill's two 
> allocators: Netty and Unsafe. That JIRA also describes the solution: limit 
> vectors to 16 MB in length (with the eventual goal of limiting overall batch 
> size.) DRILL-5517 added "size-aware" support to the column accessors created 
> to parallel Drill's existing readers and writers. (The parallel 
> implementation ensures that we don't break existing code that uses the 
> existing mechanism; same as we did for the external sort.)
> This ticket describes work to extend the column accessors to handle repeated 
> maps and lists. Key themes:
> * Define a common metadata schema for use in this layer and the "result set 
> loader" of DRILL-5657. This schema layer builds on top of the existing schema 
> to add the kind of metadata needed here and by the "sizer" created for the 
> external sort.
> * Define a JSON-like reader and writer structure that supports the full Drill 
> data model semantics. (The earlier version focused on the scalar types and 
> arrays of scalars to prove the concept of limiting vector sizes.)
> * Revising test code to use the revised column writer structure.
> Implementation details appear in the PR.



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