[SPARK-48410][SQL] Fix InitCap expression for UTF8_BINARY_LCASE & ICU collations #46732
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thanks, merging to master! |
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What changes were proposed in this pull request?
String titlecase conversion under UTF8_BINARY_LCASE and other ICU collations now work using the appropriate ICU default locale for character mapping, and uses ICU BreakIterator.getWordInstance to locate boundaries between words.
Why are the changes needed?
Similar Spark expressions such as Lower & Upper use the same interface (UCharacter) to perform collation-aware string transformation, and InitCap should offer a consistant way to titlecase strings across the collation space.
Does this PR introduce any user-facing change?
Yes, InitCap should now work properly for all collations other than UTF8_BINARY.
How was this patch tested?
New and existing unit tests, as well as existing e2e sql tests.
Was this patch authored or co-authored using generative AI tooling?
No.