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https://issues.apache.org/jira/browse/SPARK-36776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh resolved SPARK-36776.
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Resolution: Duplicate
> 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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