[jira] [Commented] (SPARK-44505) DataSource v2 Scans should not require planning the input partitions on explain

["GridGain Integration (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-44505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17745598#comment-17745598 ] 

GridGain Integration commented on SPARK-44505:
----------------------------------------------

User 'grundprinzip' has created a pull request for this issue:
https://github.com/apache/spark/pull/42099

> DataSource v2 Scans should not require planning the input partitions on explain
> -------------------------------------------------------------------------------
>
>                 Key: SPARK-44505
>                 URL: https://issues.apache.org/jira/browse/SPARK-44505
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: Martin Grund
>            Priority: Major
>
> Right now, we will always call `planInputPartitions()` for a DSv2 implementation even if there is no spark job run but only explain.
> We should provide a way to avoid scanning all input partitions just to determine if the input is columnar or not. The scan should provide an override.



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