Shixiong Zhu created SPARK-58772:
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Summary: SelectedField drops column metadata during nested column
pruning
Key: SPARK-58772
URL: https://issues.apache.org/jira/browse/SPARK-58772
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 4.0.0
Reporter: Shixiong Zhu
Assignee: Shixiong Zhu
When SelectedField prunes nested columns, it doesn't copy column metadata at
the following two places:
*
[https://github.com/apache/spark/blob/042ad7d0c4ac1c4d3e9fdeb48e2695fdeb861135/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SelectedField.scala#L88]
*
[https://github.com/apache/spark/blob/042ad7d0c4ac1c4d3e9fdeb48e2695fdeb861135/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SelectedField.scala#L112]
This can cause column metadata to be dropped and downstream cannot see the
column metadata.
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