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Posted to dev@drill.apache.org by "Kunal Khatua (JIRA)" <ji...@apache.org> on 2019/01/01 18:22:00 UTC
[jira] [Resolved] (DRILL-2517) Apply Partition pruning before
reading files during planning
[ https://issues.apache.org/jira/browse/DRILL-2517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kunal Khatua resolved DRILL-2517.
---------------------------------
Resolution: Fixed
> Apply Partition pruning before reading files during planning
> ------------------------------------------------------------
>
> Key: DRILL-2517
> URL: https://issues.apache.org/jira/browse/DRILL-2517
> Project: Apache Drill
> Issue Type: New Feature
> Components: Query Planning & Optimization
> Affects Versions: 0.7.0, 0.8.0
> Reporter: Adam Gilmore
> Assignee: Kunal Khatua
> Priority: Major
> Fix For: 1.6.0
>
>
> Partition pruning still tries to read Parquet files during the planning stage even though they don't match the partition filter.
> For example, if there were an invalid Parquet file in a directory that should not be queried:
> {code}
> 0: jdbc:drill:zk=local> select sum(price) from dfs.tmp.purchases where dir0 = 1;
> Query failed: IllegalArgumentException: file:/tmp/purchases/4/0_0_0.parquet is not a Parquet file (too small)
> {code}
> The reason is that the partition pruning happens after the Parquet plugin tries to read the footer of each file.
> Ideally, partition pruning would happen first before the format plugin gets involved.
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