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Posted to issues-all@impala.apache.org by "Taras Bobrovytsky (JIRA)" <ji...@apache.org> on 2018/07/14 00:46:00 UTC
[jira] [Assigned] (IMPALA-5621) Apply Parquet stats optimizations
in conjunction with predicates against Parquet stats
[ https://issues.apache.org/jira/browse/IMPALA-5621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Taras Bobrovytsky reassigned IMPALA-5621:
-----------------------------------------
Assignee: (was: Taras Bobrovytsky)
> Apply Parquet stats optimizations in conjunction with predicates against Parquet stats
> --------------------------------------------------------------------------------------
>
> Key: IMPALA-5621
> URL: https://issues.apache.org/jira/browse/IMPALA-5621
> Project: IMPALA
> Issue Type: Sub-task
> Components: Backend
> Reporter: Mostafa Mokhtar
> Priority: Major
>
> Impala can skip processing blocks based on predicates against Parquet statistics, for Rowgroups that qualify the predicates use data stored in the Parquet statistics to speedup the query
> {code}
> select count(*), max(ss_item_sk) from store_sales where where ss_item_sk > 10 and ss_item_sk < 9999999999;
> {code}
> For RowGroups that have min(ss_item_sk) > 10 and max(ss_item_sk) the scanner should use the count stored in the stats opposed to evaluating each row in the RowGroup, same thing applies to min/max values.
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