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fix: follow a text set operation through a scalar subquery in the guard's rewrite (#510, port of #505) - #514
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CaffeinatedCoder merged 2 commits intoOct 26, 2026
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…rd's rewrite (#505) The guard's walker treats a scalar subquery that projects a text Union, Add, Intersect or Except as derived, and so lets ==, != and Count over it through, trusting the expander to write them as mutual containment and count(DISTINCT). The expander's IsDerived had no arm for a scalar subquery, so the raw = and cardinality reached the server and compared the unsorted array_cat: {a,c} ∪ {a,b} == {a,b,c} dropped the row, and (… ?? subquery).Count counted {a,c,a,b} as 4. 10.3.0 refused the query. IsDerived now judges a scalar subquery by its one projection, as the walker does. UnionCanonicalityTests runs ==, != and Count over COALESCE through a correlated scalar subquery, and Add, Intersect and Except the same way, against memory over the loaded rows; with the arm removed both new tests fail on the answer. Found-By: RV Defect-Class: SQL Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> (cherry picked from commit 4bd2b7b)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> (cherry picked from commit a0209a8)
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Closes #510
Port of #508 (#505) to
release/10.x: both commits cherry-picked with-x, applied without conflicts.Problem
….Select(o => o.Tags.Union(x)).FirstOrDefault() == targetcompared the unsortedarray_cat, because the guard's expander didn't follow a scalar subquery that its walker had let through. 10.3.0 threw for that query, so this is a regression in the unreleased 10.4.0. #497's 10.4.0 changelog row already promises==andCountover a textUnion, and this makes it true.Change
The
IsDerivedarm, twoUnionCanonicalityTests, and the seedguard-rewrite-misses-a-scalar-subquery.No
### Changed answersrow and nosilentlabel: no release shipped the wrong answer.Tests
UnionCanonicalityTests17/17. With the seed applied, both new tests fail (15/17).-p:EfFloat=10.0.13 -p:NpgsqlEfFloat=10.0.3):UnionCanonicalityTests17/17.🤖 Generated with Claude Code