Doc: clarify behavior of standard aggregates for null inputs.
Section 4.2.7 says that unless otherwise specified, built-in
aggregates ignore rows in which any input is null. This is
not true of the JSON aggregates, but it wasn't documented.
Fix that.
Of the other entries in table 9.55, some were explicit about
ignoring nulls, and some weren't; for consistency and
self-contained-ness, make them all say it explicitly.
Per bug #15884 from Tim Möhlmann. Back-patch to all supported
branches.
Discussion: https://postgr.es/m/15884-c32d848f787fcae3@postgresql.org
Branch
------
REL9_4_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/fe50481899e890d5d2587fbd4748b658667dc71a
Modified Files
--------------
doc/src/sgml/func.sgml | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)
