pgsql: Doc: caution against misuse of 'now' and related datetime litera

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pgsql: Doc: caution against misuse of 'now' and related datetime litera

Tom Lane-2
Doc: caution against misuse of 'now' and related datetime literals.

Section 8.5.1.4, which defines these literals, made only a vague
reference to the fact that they might be evaluated too soon to be
safe in non-interactive contexts.  Provide a more explicit caution
against misuse.  Also, generalize the wording in the related tip in
section 9.9.4: while it clearly described this problem, it implied
(or really, stated outright) that the problem only applies to table
DEFAULT clauses.

Per gripe from Tijs van Dam.  Back-patch to all supported branches.

Discussion: https://postgr.es/m/c2LuRv9BiRT3bqIo5mMQiVraEXey_25B4vUn0kDqVqilwOEu_iVF1tbtvLnyQK7yDG3PFaz_GxLLPil2SDkj1MCObNRVaac-7j1dVdFERk8=@thalex.com

Branch
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REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/133d06f7bbf5fcf24f1fdbf0e013e30446f61abd

Modified Files
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doc/src/sgml/datatype.sgml | 20 +++++++++++++++++---
doc/src/sgml/func.sgml     |  8 +++++---
2 files changed, 22 insertions(+), 6 deletions(-)