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https://issues.apache.org/jira/browse/DRILL-3874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14939081#comment-14939081
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Jacques Nadeau commented on DRILL-3874:
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The simplest solution to the single flatten problem is we add projection to the
operator. However, this will be incomplete in the situation where there are
multiple stacked flattens.
> flattening large JSON objects consumes too much direct memory
> -------------------------------------------------------------
>
> Key: DRILL-3874
> URL: https://issues.apache.org/jira/browse/DRILL-3874
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Flow
> Affects Versions: 1.1.0
> Reporter: Chris Westin
> Assignee: Chris Westin
>
> A JSON record has a field whose value is an array with 20,000 elements; the
> record's size is 4MB. A select is used to flatten this. The query profile
> reports that the peak memory utilization was 8GB, most of it used by the
> flatten.
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