[jira] [Commented] (SPARK-36776) Partition filter of DataSourceV2ScanRelation can not push down when select none dataSchema from FileScan

["Hyukjin Kwon (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-36776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17416451#comment-17416451 ] 

Hyukjin Kwon commented on SPARK-36776:
--------------------------------------

I think this is fixed at SPARK-36351. cc [~huaxingao] FYI

> Partition filter of DataSourceV2ScanRelation can not push down when select none dataSchema from FileScan
> --------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-36776
>                 URL: https://issues.apache.org/jira/browse/SPARK-36776
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.1.2
>            Reporter: suheng.cloud
>            Priority: Major
>
> In PruneFileSourcePartitions rule, the FileScan::withFilters is called to push down partition prune filter(and this is the only place this function can be called), but it has a constraint that “scan.readDataSchema.nonEmpty” 
>  [source code here|https://github.com/apache/spark/blob/de351e30a90dd988b133b3d00fa6218bfcaba8b8/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/PruneFileSourcePartitions.scala#L114]
>  We use spark sql in custom catalog and execute the count sql like: select count( * ) from catalog.db.tbl where dt=‘0812’ (also in other sqls if we not select any col reference to tbl), in which dt is a partition key.
> In this case the scan.readDataSchema is empty indeed and no scan partition prune performed, which cause scan all partition at last.



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