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Posted to dev@parquet.apache.org by "Gabor Szadovszky (Jira)" <ji...@apache.org> on 2023/02/15 11:00:00 UTC
[jira] [Assigned] (PARQUET-2244) Dictionary filter may skip row-groups incorrectly when evaluating notIn
[ https://issues.apache.org/jira/browse/PARQUET-2244?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gabor Szadovszky reassigned PARQUET-2244:
-----------------------------------------
Assignee: Yujiang Zhong
> Dictionary filter may skip row-groups incorrectly when evaluating notIn
> -----------------------------------------------------------------------
>
> Key: PARQUET-2244
> URL: https://issues.apache.org/jira/browse/PARQUET-2244
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Affects Versions: 1.12.2
> Reporter: Yujiang Zhong
> Assignee: Yujiang Zhong
> Priority: Major
>
> Dictionary filter may skip row-groups incorrectly when evaluating `notIn` on optional columns with null values. Here is an example:
> Say there is a optional column `c1` with all pages dict encoded, `c1` has and only has two distinct values: ['foo', null], and the predicate is `c1 not in ('foo', 'bar')`.
> Now dictionary filter may skip this row-group that is actually should not be skipped, because there are nulls in the column.
>
> This is a bug similar to #1510.
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