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https://issues.apache.org/jira/browse/DRILL-5796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16508130#comment-16508130
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ASF GitHub Bot commented on DRILL-5796:
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jbimbert commented on issue #1298: DRILL-5796: Filter pruning for multi
rowgroup parquet file
URL: https://github.com/apache/drill/pull/1298#issuecomment-396262789
Tests DRILL_6259 are now OK.
The issue came from a query of the form "select * from t where t.col[2] >
1", where col[] is an array; in this case, we can't deduce the value of the
column from the metadata of the row group, especially is col[2] is null for
example.
To correct this issue, I chose to set filter result as ROWS_MATCH.SOME
instead of ROWS_MATCH.ALL for array columns only.
This should impact only queries on array columns, which will run as usual
(with no filter pruning).
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> Filter pruning for multi rowgroup parquet file
> ----------------------------------------------
>
> Key: DRILL-5796
> URL: https://issues.apache.org/jira/browse/DRILL-5796
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - Parquet
> Reporter: Damien Profeta
> Assignee: Jean-Blas IMBERT
> Priority: Major
> Fix For: 1.14.0
>
>
> Today, filter pruning use the file name as the partitioning key. This means
> you can remove a partition only if the whole file is for the same partition.
> With parquet, you can prune the filter if the rowgroup make a partition of
> your dataset as the unit of work if the rowgroup not the file.
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