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bindings docs and tests: known issues and tripwires for upstream #9277, #9278, and #9281 - #198
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…upstream ArcadeData#9277, ArcadeData#9278, and ArcadeData#9281 The openCypher COUNT ANTI-JOIN CHAIN push-down counts wrong when the far end of the chain has another label than the first hop's target (ArcadeData#9277; upstream ArcadeData#9271 lets id(a) <> id(b) reach it) and when the negated pattern's relationship has a property map (ArcadeData#9278), and sum() and avg() over a BYTE property raise IllegalArgumentException (ArcadeData#9281). Each entry has a workaround that is a plain test (a WITH before the WHERE, a conversion before the aggregate), tests of the cases that are not affected, and strict xfail tests of the wrong answers that start failing the suite when the engine fixes them. The plan check calls pytest.fail so a tripwire cannot pass by comparing the row pipeline with itself. Closes #197. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Ubz3m6QXHESerCkehC1qgi
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Summary
Three engine bugs found while verifying upstream fixes reach Python users, each with a known-issues entry, a verified workaround, and tests.
id(a) <> id(b)reach it ArcadeData/arcadedb#9277: the openCypherCOUNT ANTI-JOIN CHAINpush-down counts 0 where the answer is 1 when the far end of a chain has another label than the first hop's target. Upstream Fix Gremlin fractional index bound, MATCH WHERE evaluated twice, anti-join push-down and filter placement (#9206 #9203 #9202 #9167) ArcadeData/arcadedb#9271 letsid(a) <> id(b)reach it, so that spelling, right before, is wrong now.NOT (x)-[:K {w: 1}]->(z)is counted asNOT (x)-[:K]->(z)) ArcadeData/arcadedb#9278: the same push-down drops the property map of the negated pattern's relationship, soNOT (x)-[:K {w: 1}]->(z)is counted asNOT (x)-[:K]->(z).sum()andavg()over aBYTEproperty raiseIllegalArgumentExceptionin SQL and openCypher.The workarounds are plain tests (a
WITHbefore theWHERE, which keeps the query off the push-down, andb.asInteger()ortoInteger(n.b)before the aggregate), with tests of the cases that are not affected; the wrong answers are strictxfailtests that start failing the suite when the engine fixes them. The plan check callspytest.fail, so a tripwire cannot pass by comparing the row pipeline with itself.Verification
Through the bindings on the CI jar of upstream d36b4ca (the wheel's bundled JDK 25): 15 passed and 9 xfailed in
tests/test_count_pushdown_known_issues.py. With the 26.9.1 engine jars only the twoid()cases fail, because that engine does not push them down, which is what the plan check is for. In Java, byte-identical repros on Temurin 25 with compact object headers and on Temurin 21 give the same answers on 26.9.1, 5a90b0f, and d36b4ca.Closes #197.
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