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

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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
This commit is contained in:
Tom Lane
2022-07-09 15:10:15 -04:00
parent 8c73c11a0d
commit 3cd0ac9878
4 changed files with 41 additions and 25 deletions
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13
src/backend/nodes/outfuncs.c
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@@ -10,19 +10,6 @@
* IDENTIFICATION
* src/backend/nodes/outfuncs.c
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
* have an output function defined here (as well as an input function
* in readfuncs.c). In addition, plan nodes should have input and
* output functions so that they can be sent to parallel workers.
*
* For use in debugging, we also provide output functions for nodes
* that appear in raw parsetrees and planner Paths. These node types
* need not have input functions. Output support for raw parsetrees
* is somewhat incomplete, too; in particular, utility statements are
* almost entirely unsupported. We try to support everything that can
* appear in a raw SELECT, though.
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"