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

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 3cd0ac987819280eb8dd3e0997f0294b8bc6355a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2022-07-09T19:10:15Z
Releases: 16.0
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

Files

PathChange+/−
src/backend/nodes/outfuncs.c modified +0 −13
src/backend/nodes/readfuncs.c modified +1 −5
src/backend/nodes/README modified +25 −1
src/include/nodes/execnodes.h modified +15 −6

Discussion