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

["suheng.cloud (Jira)" <ji...@apache.org>]

suheng.cloud created SPARK-36776:
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             Summary: 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


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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