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### What changes were proposed in this pull request? This PR fixes a CTE substitution issue so as to the following SQL return the correct empty result: ``` WITH t(c) AS (SELECT 1) SELECT * FROM t WHERE c IN ( WITH t(c) AS (SELECT 2) SELECT * FROM t ) ``` Before this PR the result was `1`. ### Why are the changes needed? To fix a correctness issue. ### Does this PR introduce any user-facing change? Yes, fixes a correctness issue. ### How was this patch tested? Added new test case. Closes #28318 from peter-toth/SPARK-31535-fix-nested-cte-substitution. Authored-by: Peter Toth <peter.toth@gmail.com> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org> |
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