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https://issues.apache.org/jira/browse/SPARK-57472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18089200#comment-18089200
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Matthew Bayer commented on SPARK-57472:
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https://github.com/apache/spark/pull/56520
> Make FileTable.mergedOptions merge table and relation options
> case-insensitively
> --------------------------------------------------------------------------------
>
> Key: SPARK-57472
> URL: https://issues.apache.org/jira/browse/SPARK-57472
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.1.2, 4.0.3, 4.2.1
> Reporter: Matthew Bayer
> Priority: Major
> Labels: pull-request-available
>
> FileTable.mergedOptions merges a table's options with the relation's options,
> with the relation's taking precedence. The merge is case-sensitive, so when
> the table and relation set the same key with different casing (e.g. lineSep
> vs linesep), both entries survive and CaseInsensitiveStringMap collapses them
> by arbitrary HashMap order, silently dropping one. The documented precedence
> is not honored across casing, and the winner is non-deterministic.
> Fix: drop any table option the relation already sets (case-insensitively, via
> CaseInsensitiveStringMap.containsKey) before merging, so the relation value
> deterministically wins. No change for correctly-cased options. Affects
> unreleased master only.
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