pgsql: Doc: rearrange high-level commentary about node support coverage

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Doc: rearrange high-level commentary about node support coverage
Date: 2022-07-09 19:15:14
Message-ID: E1oAFv7-00202F-Cr@gemulon.postgresql.org
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Doc: rearrange high-level commentary about node support coverage.

copyfuncs.c and friends no longer seem like great places to put
high-level remarks about what's covered and what isn't. Move that
material to backend/nodes/README and other more-prominent places.
Add back (versions of) some remarks that disappeared in 2be87f092.

Discussion: https://postgr.es/m/3843645.1657385930@sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/3cd0ac987819280eb8dd3e0997f0294b8bc6355a

Modified Files
--------------
src/backend/nodes/README | 26 +++++++++++++++++++++++++-
src/backend/nodes/outfuncs.c | 13 -------------
src/backend/nodes/readfuncs.c | 6 +-----
src/include/nodes/execnodes.h | 21 +++++++++++++++------
4 files changed, 41 insertions(+), 25 deletions(-)

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