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This was not something that required consideration before MERGE
was invented; but MERGE builds a join tree that left-joins to the
result relation, meaning that remove_useless_joins will consider
removing it. That should generally be stopped by the query's use
of output variables from the result relation. However, if the
result relation is inherited (e.g. a partitioned table) then
we don't add any row identity variables to the query until
expand_inherited_rtentry, which happens after join removal.
This was exposed as of commit
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backend | ||
bin | ||
common | ||
fe_utils | ||
include | ||
interfaces | ||
makefiles | ||
pl | ||
port | ||
template | ||
test | ||
timezone | ||
tools | ||
tutorial | ||
.gitignore | ||
DEVELOPERS | ||
Makefile | ||
Makefile.global.in | ||
Makefile.shlib | ||
nls-global.mk |