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https://issues.apache.org/jira/browse/DRILL-7509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17014615#comment-17014615
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ASF GitHub Bot commented on DRILL-7509:
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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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