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Doc: update libpq's documentation for PQfn().
authorTom Lane <tgl@sss.pgh.pa.us>
Fri, 30 Apr 2021 19:10:06 +0000 (15:10 -0400)
committerTom Lane <tgl@sss.pgh.pa.us>
Fri, 30 Apr 2021 19:10:06 +0000 (15:10 -0400)
commitd25997f898dd8c36fc7acad3f22366f18b548200
treee7dfff7c019f52d531e1e6d20bcc8c60821f3826tree
parentebc2ff076ef24d58cd488dbd010ebeb052378625commit | diff
Doc: update libpq's documentation for PQfn().

Mention specifically that you can't call aggregates, window functions,
or procedures this way (the inability to call SRFs was already
mentioned).

Also, the claim that PQfn doesn't support NULL arguments or results
has been a lie since we invented protocol 3.0.  Not sure why this
text was never updated for that, but do it now.

Discussion: https://postgr.es/m/2039442.1615317309@sss.pgh.pa.us
doc/src/sgml/libpq.sgml diff | blob | blame | history
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