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### What changes were proposed in this pull request? This PR partially revert SPARK-31292 in order to provide a hot-fix for a bug in `Dataset.dropDuplicates`; we must preserve the input order of `colNames` for `groupCols` because the Streaming's state store depends on the `groupCols` order. ### Why are the changes needed? Bug fix. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Added tests in `DataFrameSuite`. Closes #28830 from maropu/SPARK-31990. Authored-by: Takeshi Yamamuro <yamamuro@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org> |
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