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Tom Lane 1518d07842 Fix crash when logical decoding is invoked from a PL function. ... The logical decoding functions do BeginInternalSubTransaction and RollbackAndReleaseCurrentSubTransaction to clean up after themselves. It turns out that AtEOSubXact_SPI has an unrecognized assumption that we always need to cancel the active SPI operation in the SPI context that surrounds the subtransaction (if there is one). That's true when the RollbackAndReleaseCurrentSubTransaction call is coming from the SPI-using function itself, but not when it's happening inside some unrelated function invoked by a SPI query. In practice the affected callers are the various PLs. To fix, record the current subtransaction ID when we begin a SPI operation, and clean up only if that ID is the subtransaction being canceled. Also, remove AtEOSubXact_SPI's assertion that it must have cleaned up the surrounding SPI context's active tuptable. That's proven wrong by the same test case. Also clarify (or, if you prefer, reinterpret) the calling conventions for _SPI_begin_call and _SPI_end_call. The memory context cleanup in the latter means that these have always had the flavor of a matched resource-management pair, but they weren't documented that way before. Per report from Ben Chobot. Back-patch to 9.4 where logical decoding came in. In principle, the SPI changes should go all the way back, since the problem dates back to commit 7ec1c5a86. But given the lack of field complaints it seems few people are using internal subtransactions in this way. So I don't feel a need to take any risks in 9.2/9.3. Discussion: https://postgr.es/m/73FBA179-C68C-4540-9473-71E865408B15@silentmedia.com		8 years ago
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expected	Fix crash when logical decoding is invoked from a PL function.	8 years ago
specs	Fix race condition leading to hanging logical slot creation.	8 years ago
sql	Fix crash when logical decoding is invoked from a PL function.	8 years ago
.gitignore	Improve isolation tests infrastructure.	9 years ago
Makefile	Improve isolation tests infrastructure.	9 years ago
logical.conf	…
test_decoding.c	Change tupledesc->attrs[n] to TupleDescAttr(tupledesc, n).	8 years ago