HyukjinKwon opened a new pull request #27990: [SPARK-31229][SQL][TESTS] Add unit tests TypeCoercion.findTypeForComplex and Cast.canCast in null <> complex types URL: https://github.com/apache/spark/pull/27990 ### What changes were proposed in this pull request? This PR is rather a followup of https://github.com/apache/spark/pull/27926. It adds unittests for `TypeCoercion.findTypeForComplex` and `Cast.canCast` about struct, map and array with the respect to null types. ### Why are the changes needed? To detect which scope was broken in the future easily. ### Does this PR introduce any user-facing change? No, it's a test-only. ### How was this patch tested? Unittests were added.
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