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Rework custom scans to work more like the new extensible node stuff.

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Per discussion, the new extensible node framework is thought to be
better designed than the custom path/scan/scanstate stuff we added
in PostgreSQL 9.5.  Rework the latter to be more like the former.

This is not backward-compatible, but we generally don't promise that
for C APIs, and there probably aren't many people using this yet
anyway.

KaiGai Kohei, reviewed by Petr Jelinek and me.  Some further
cosmetic changes by me.
This commit is contained in:
Robert Haas
2016-03-29 11:00:18 -04:00
parent 534da37927
commit f9143d102f
10 changed files with 184 additions and 117 deletions
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src/backend/optimizer/plan/createplan.c
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@ -24,6 +24,7 @@
#include "catalog/pg_class.h"
#include "foreign/fdwapi.h"
#include "miscadmin.h"
#include "nodes/extensible.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/clauses.h"