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Posted to issues@drill.apache.org by "Chris Westin (JIRA)" <ji...@apache.org> on 2015/10/01 00:37:04 UTC

[jira] [Created] (DRILL-3874) flattening large JSON objects consumes too much direct memory

Chris Westin created DRILL-3874:
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             Summary: 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 - Data Types
    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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