viirya commented on PR #19857:
URL: https://github.com/apache/datafusion/pull/19857#issuecomment-4270322292

   We cross-validated all test cases (Test 1–25) against Postgres 16 running in 
a Docker container. We translated each .slt test into equivalent Postgres SQL 
and compared the output row-by-row against DataFusion's expected results. All 
25 tests matched Postgres exactly, covering single-column NOT IN (Tests 1–18), 
multi-column NOT IN (Tests 19–23), correlated multi-column NOT IN (Test 24), 
and empty subquery (Test 25).


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