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https://issues.apache.org/jira/browse/DRILL-5797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16476023#comment-16476023
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Arina Ielchiieva commented on DRILL-5797:
-----------------------------------------
It looks like ParquetSchema is sharpened to work with flat schema. In our case
we are passing complex schema since we only intend to read simple columns.
Looks like we need to review ParquetSchema class and determine places where fix
is needed so it handles complex fields names correctly, so far it is
fieldSelected and getColNameToSchemaElementMapping methods but could be more.
> Use more often the new parquet reader
> -------------------------------------
>
> Key: DRILL-5797
> URL: https://issues.apache.org/jira/browse/DRILL-5797
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - Parquet
> Reporter: Damien Profeta
> Assignee: Oleksandr Kalinin
> Priority: Major
> Fix For: 1.14.0
>
>
> The choice of using the regular parquet reader of the optimized one is based
> of what type of columns is in the file. But the columns that are read by the
> query doesn't matter. We can increase a little bit the cases where the
> optimized reader is used by checking is the projected column are simple or
> not.
> This is an optimization waiting for the fast parquet reader to handle complex
> structure.
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