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Richard Guo f64ec81a81 Avoid unnecessary wrapping for Vars and PHVs ... When pulling up a lateral subquery that is under an outer join, the current code always wraps a Var or PHV in the subquery's targetlist into a new PlaceHolderVar if it is a lateral reference to something outside the subquery. This is necessary when the Var/PHV references the non-nullable side of the outer join from the nullable side: we need to ensure that it is evaluated at the right place and hence is forced to null when the outer join should do so. However, if the referenced rel is under the same lowest nulling outer join, we can actually omit the wrapping. That's safe because if the subquery variable is forced to NULL by the outer join, the lateral reference variable will come out as NULL too. It could be beneficial to get rid of such PHVs because they imply lateral dependencies, which force us to resort to nestloop joins. This patch leverages the newly introduced nullingrel_info to check if the nullingrels of the subquery RTE are a subset of those of the laterally referenced rel, in order to determine if the referenced rel is under the same lowest nulling outer join. No backpatch as this could result in plan changes. Author: Richard Guo Reviewed-by: James Coleman, Dmitry Dolgov, Andrei Lepikhov Discussion: https://postgr.es/m/CAMbWs48uk6C7Z9m_FNT8_21CMCk68hrgAsz=z6zpP1PNZMkeoQ@mail.gmail.com		1 year ago
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backend	Avoid unnecessary wrapping for Vars and PHVs	1 year ago
bin	Remove useless casts to (const void *)	1 year ago
common	jsonapi: add lexer option to keep token ownership	1 year ago
fe_utils	Remove unused #include's from bin .c files	1 year ago
include	Fix memory leak in pgoutput with publication list cache	1 year ago
interfaces	Fix printf format string warning on MinGW.	1 year ago
makefiles	Use __attribute__((target(...))) for AVX-512 support.	1 year ago
pl	Remove useless casts to (void *)	1 year ago
port	Use <stdint.h> and <inttypes.h> for c.h integers.	1 year ago
template	thread-safety: gmtime_r(), localtime_r()	1 year ago
test	Avoid unnecessary wrapping for Vars and PHVs	1 year ago
timezone	Update time zone data files to tzdata release 2024b.	1 year ago
tools	Provide a better error message for misplaced dispatch options.	1 year ago
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Makefile.global.in	Use <stdint.h> and <inttypes.h> for c.h integers.	1 year ago
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