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From "Apache Spark (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-32985) Decouple bucket filter pruning and bucket table scan
Date Mon, 01 Feb 2021 06:30:01 GMT

     [ https://issues.apache.org/jira/browse/SPARK-32985?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-32985:
------------------------------------

    Assignee:     (was: Apache Spark)

> Decouple bucket filter pruning and bucket table scan
> ----------------------------------------------------
>
>                 Key: SPARK-32985
>                 URL: https://issues.apache.org/jira/browse/SPARK-32985
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: Cheng Su
>            Priority: Minor
>
> As a followup from discussion in [https://github.com/apache/spark/pull/29804#discussion_r493100510] .
Currently in data source v1 file scan `FileSourceScanExec`, bucket filter pruning will only
take effect with bucket table scan - [https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala#L542] .
However this is unnecessary, as bucket filter pruning can also happen if we disable bucketed
table scan. This help query leverage the benefit from bucket filter pruning to save CPU/IO
to not read unnecessary bucket files, and do not bound by bucket table scan when the parallelism
of tasks is a concern.



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