[jira] [Commented] (DRILL-7509) Incorrect TupleSchema is created for DICT column when querying Parquet files

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-7509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17014615#comment-17014615 ] 

ASF GitHub Bot commented on DRILL-7509:
---------------------------------------

KazydubB commented on pull request #1954: DRILL-7509: Incorrect TupleSchema is created for DICT column when querying Parquet files
URL: https://github.com/apache/drill/pull/1954
 
 
   # [DRILL-7509](https://issues.apache.org/jira/browse/DRILL-7509): Incorrect TupleSchema is created for DICT column when querying Parquet files
   
   ## Description
   
   Removed nested `MapColumnMetadata` from `DictColumnMetadata`'s `schema` when querying `MAP` type from Parquet files (this nested column comes from the Parquet MAP structure). So the `DictColumnMetadata#schema` contains `key` and `value` fields directly.
   
   Added Parquet's `Type.Repetition` to `Metadata_V4` cache file to retain the actual `DataMode` of leaf primitives (previously this mode was computed based on max `repetition` and max `definition` levels, see javadoc @ `ParquetTableMetadataUtils#getDataMode(Type.Repetition)`).
   
 
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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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