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https://issues.apache.org/jira/browse/DRILL-4664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15319057#comment-15319057
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Vitalii Diravka commented on DRILL-4664:
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Noticed that this probably happened because after creating "previous
InternalBatch" in StreamingAggTemplate a new MapVector in MapTransferPair is
created with the same SchemaChangeCallBack one (the same in
RepeateedMapVector). I assume we need a new SchemaChangeCallBack there.
> ScanBatch.isNewSchema() returns wrong result for map datatype
> -------------------------------------------------------------
>
> Key: DRILL-4664
> URL: https://issues.apache.org/jira/browse/DRILL-4664
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Flow
> Affects Versions: 1.6.0
> Reporter: Vitalii Diravka
> Priority: Minor
>
> isNewSchema() method checks if top-level schema or any of the deeper map
> schemas has changed. The last one doesn't work properly with count function.
> "deeperSchemaChanged" equals true even when two map strings have the same
> children fields.
> Discovered while trying to fix [DRILL-2385|DRILL-2385].
> Dataset test.json for reproducing (MAP<REQUIRED> datatype object):
> {code}{"oooi":{"oa":{"oab":{"oabc":1}}}}{code}
> Example of query:
> {code}select count(t.oooi) from dfs.tmp.`test.json` t{code}
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