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https://issues.apache.org/jira/browse/DRILL-7509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17020518#comment-17020518
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ASF GitHub Bot commented on DRILL-7509:
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paul-rogers commented on issue #1954: DRILL-7509: Incorrect TupleSchema is
created for DICT column when querying Parquet files
URL: https://github.com/apache/drill/pull/1954#issuecomment-576848091
@KazydubB, thanks for your explanation. This area is very complex. I wonder,
is there a way to add a comment that summarizes the issue so future readers can
figure out what's what?
It seems we have a number of issues around DICT. The type is a fine idea by
itself. The complexity is to force-fit it into Drill and SQL which were not
designed to support this type. We'll leave those issues for another time.
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> Incorrect TupleSchema is created for DICT column when querying Parquet files
> ----------------------------------------------------------------------------
>
> Key: DRILL-7509
> URL: https://issues.apache.org/jira/browse/DRILL-7509
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.16.0
> Reporter: Bohdan Kazydub
> Assignee: Bohdan Kazydub
> Priority: Major
> Fix For: 1.18.0
>
>
> When {{DICT}} column is queried from Parquet file, its {{TupleSchema}}
> contains nested element, e.g. `map`, itself contains `key` and `value`
> fields, rather than containing the `key` and `value` fields in the {{DICT}}'s
> {{TupleSchema}} itself. The nested element, `map`, comes from the inner
> structure of Parquet's {{MAP}} (which corresponds to Drill's {{DICT}})
> representation.
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