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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/03/31 22:32:00 UTC

[jira] [Commented] (SPARK-34923) Metadata output should not always be propagated

    [ https://issues.apache.org/jira/browse/SPARK-34923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17312743#comment-17312743 ] 

Apache Spark commented on SPARK-34923:
--------------------------------------

User 'karenfeng' has created a pull request for this issue:
https://github.com/apache/spark/pull/32017

> Metadata output should not always be propagated
> -----------------------------------------------
>
>                 Key: SPARK-34923
>                 URL: https://issues.apache.org/jira/browse/SPARK-34923
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Karen Feng
>            Priority: Major
>
> Today, the vast majority of expressions uncritically propagate metadata output from their children. As a general rule, it seems reasonable that only expressions that propagate their children's output should also propagate their children's metadata output.



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