[SPARK-49671][SQL] Remove the RTRIM collation config #53576
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What changes were proposed in this pull request?
Cleanup SQL configs by removing
TRIM_COLLATION_ENABLEDand its surrounding code changes, thus eliminating thespark.sql.collation.trim.enabledfeature flag from the codebase.Why are the changes needed?
Collations and RTRIM are already enabled by default, and these configs are no longer needed.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Existing tests suffice. Outdated tests have been removed.
Was this patch authored or co-authored using generative AI tooling?
No.