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Add isolation test for INSERT ON CONFLICT speculative insertion failure.
This path previously was not reliably covered. There was some heuristic coverage via insert-conflict-toast.spec, but that test is not deterministic, and only tested for a somewhat specific bug. Backpatch, as this is a complicated and otherwise untested code path. Unfortunately 9.5 cannot handle two waiting sessions, and thus cannot execute this test. Triggered by a conversion with Melanie Plageman. Author: Andres Freund Discussion: https://postgr.es/m/CAAKRu_a7hbyrk=wveHYhr4LbcRnRCG=yPUVoQYB9YO1CdUBE9Q@mail.gmail.com Backpatch: 9.5-
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- src/test/isolation/expected/insert-conflict-specconflict.out 179 additions, 0 deletionssrc/test/isolation/expected/insert-conflict-specconflict.out
- src/test/isolation/isolation_schedule 1 addition, 0 deletionssrc/test/isolation/isolation_schedule
- src/test/isolation/specs/insert-conflict-specconflict.spec 149 additions, 0 deletionssrc/test/isolation/specs/insert-conflict-specconflict.spec
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