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Tom Lane b69bdcee9c Avoid assertion due to disconnected NFA sub-graphs in regex parsing. ... In commit 08c0d6ad6 which introduced "rainbow" arcs in regex NFAs, I didn't think terribly hard about what to do when creating the color complement of a rainbow arc. Clearly, the complement cannot match any characters, and I took the easy way out by just not building any arcs at all in the complement arc set. That mostly works, but Nikolay Shaplov found a case where it doesn't: if we decide to delete that sub-NFA later because it's inside a "{0}" quantifier, delsub() suffered an assertion failure. That's because delsub() relies on the target sub-NFA being fully connected. That was always true before, and the best fix seems to be to restore that property. Hence, invent a new arc type CANTMATCH that can be generated in place of an empty color complement, and drop it again later when we start NFA optimization. (At that point we don't need to do delsub() any more, and besides there are other cases where NFA optimization can lead to disconnected subgraphs.) It appears that this bug has no consequences in a non-assert-enabled build: there will be some transiently leaked NFA states/arcs, but they'll get cleaned up eventually. Still, we don't like assertion failures, so back-patch to v14 where rainbow arcs were introduced. Per bug #18708 from Nikolay Shaplov. Discussion: https://postgr.es/m/18708-f94f2599c9d2c005@postgresql.org		1 year ago
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backend	Avoid assertion due to disconnected NFA sub-graphs in regex parsing.	1 year ago
bin	Avoid deleting critical WAL segments during pg_rewind	1 year ago
common	Remove unused #include's from bin .c files	1 year ago
fe_utils	Remove unused #include's from bin .c files	1 year ago
include	Avoid assertion due to disconnected NFA sub-graphs in regex parsing.	1 year ago
interfaces	libpq: Bail out during SSL/GSS negotiation errors	1 year ago
makefiles	Use __attribute__((target(...))) for AVX-512 support.	1 year ago
pl	Fix cross-version upgrade tests.	1 year ago
port	Move check for USE_AVX512_POPCNT_WITH_RUNTIME_CHECK.	1 year ago
template	thread-safety: gmtime_r(), localtime_r()	1 year ago
test	Avoid assertion due to disconnected NFA sub-graphs in regex parsing.	1 year ago
timezone	Update time zone data files to tzdata release 2024b.	1 year ago
tools	Avoid deleting critical WAL segments during pg_rewind	1 year ago
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Makefile.global.in	Use __attribute__((target(...))) for AVX-512 support.	1 year ago
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meson.build	…
nls-global.mk	…