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[SPARK-49264][SQL][TESTS] Add collation support unit tests for Contai…
…ns, StartsWith, and EndsWith ### What changes were proposed in this pull request? Add collation support unit tests for: - Contains - StartsWith - EndsWith This PR contains test-only changes, providing additional test coverage for cases such as: - case and accent variation - one-to-many case mapping - conditional case mapping - surrogate pairs - etc. ### Why are the changes needed? Improve collation support testing. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? New unit tests in `CollationSupportSuite`. ### Was this patch authored or co-authored using generative AI tooling? Yes. Closes #47726 from uros-db/unit-tests-2. Authored-by: Uros Bojanic <[email protected]> Signed-off-by: Max Gekk <[email protected]>
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