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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2021/02/25 14:42:00 UTC
[jira] [Assigned] (IMPALA-9470) Use Parquet bloom filters
[ https://issues.apache.org/jira/browse/IMPALA-9470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Csaba Ringhofer reassigned IMPALA-9470:
---------------------------------------
Assignee: Daniel Becker
> Use Parquet bloom filters
> -------------------------
>
> Key: IMPALA-9470
> URL: https://issues.apache.org/jira/browse/IMPALA-9470
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend
> Reporter: Zoltán Borók-Nagy
> Assignee: Daniel Becker
> Priority: Major
> Labels: parquet
>
> PARQUET-41 has been closed recently. This means Parquet-MR is capable of writing and reading bloom filters.
> Currently bloom filters are per column chunk entries, i.e. with their help we can filter out entire row groups.
> We already filter row groups in HdfsParquetScanner::NextRowGroup() based on column chunk statistics and dictionaries. Skipping row groups based on bloom filters could be also added to this funciton.
> Impala could also write bloom filters.
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