pgsql: Doc: flesh out fmgr/README's description of context-node usage.

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Doc: flesh out fmgr/README's description of context-node usage.
Date: 2022-12-03 15:50:48
Message-ID: E1p1Umu-001qoW-00@gemulon.postgresql.org
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Doc: flesh out fmgr/README's description of context-node usage.

I wrote this to provide a home for a planned discussion of error
return conventions for non-error-throwing functions. But it seems
useful as documentation of existing code no matter what becomes of
that proposal, so commit separately.

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/29452de7341b0effbc275d7e139ade83cebda69f

Modified Files
--------------
src/backend/utils/fmgr/README | 42 +++++++++++++++++++++++++++++++++++++-----
1 file changed, 37 insertions(+), 5 deletions(-)

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