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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2023/01/24 15:06:00 UTC

[jira] [Commented] (SPARK-42163) Schema pruning fails on non-foldable array index or map key

    [ https://issues.apache.org/jira/browse/SPARK-42163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17680248#comment-17680248 ] 

Apache Spark commented on SPARK-42163:
--------------------------------------

User 'cashmand' has created a pull request for this issue:
https://github.com/apache/spark/pull/39718

> Schema pruning fails on non-foldable array index or map key
> -----------------------------------------------------------
>
>                 Key: SPARK-42163
>                 URL: https://issues.apache.org/jira/browse/SPARK-42163
>             Project: Spark
>          Issue Type: Bug
>          Components: Optimizer
>    Affects Versions: 3.2.3
>            Reporter: David Cashman
>            Priority: Major
>
> Schema pruning tries to extract selected fields from struct extractors. It looks through GetArrayItem/GetMapItem, but when doing so, it ignores the index/key, which may itself be a struct field. If it is a struct field that is not otherwise selected, and some other field of the same attribute is selected, then pruning will drop the field, resulting in an optimizer error.



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