pgsql: Split the processing of INSERT/UPDATE/DELETE operations out of

Log Message:
-----------
Split the processing of INSERT/UPDATE/DELETE operations out of execMain.c.
They are now handled by a new plan node type called ModifyTable, which is
placed at the top of the plan tree.  In itself this change doesn't do much,
except perhaps make the handling of RETURNING lists and inherited UPDATEs a
tad less klugy.  But it is necessary preparation for the intended extension of
allowing RETURNING queries inside WITH.

Marko Tiikkaja

Modified Files:
--------------
    pgsql/doc/src/sgml:
        arch-dev.sgml (r2.32 -> r2.33)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/arch-dev.sgml?r1=2.32&r2=2.33)
    pgsql/src/backend/commands:
        explain.c (r1.190 -> r1.191)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/explain.c?r1=1.190&r2=1.191)
        trigger.c (r1.252 -> r1.253)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/trigger.c?r1=1.252&r2=1.253)
    pgsql/src/backend/executor:
        Makefile (r1.29 -> r1.30)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/Makefile?r1=1.29&r2=1.30)
        README (r1.8 -> r1.9)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/README?r1=1.8&r2=1.9)
        execAmi.c (r1.104 -> r1.105)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execAmi.c?r1=1.104&r2=1.105)
        execJunk.c (r1.58 -> r1.59)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execJunk.c?r1=1.58&r2=1.59)
        execMain.c (r1.331 -> r1.332)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execMain.c?r1=1.331&r2=1.332)
        execProcnode.c (r1.66 -> r1.67)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execProcnode.c?r1=1.66&r2=1.67)
        nodeAppend.c (r1.75 -> r1.76)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeAppend.c?r1=1.75&r2=1.76)
        spi.c (r1.209 -> r1.210)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/spi.c?r1=1.209&r2=1.210)
    pgsql/src/backend/nodes:
        copyfuncs.c (r1.442 -> r1.443)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c?r1=1.442&r2=1.443)
        outfuncs.c (r1.366 -> r1.367)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c?r1=1.366&r2=1.367)
    pgsql/src/backend/optimizer/plan:
        createplan.c (r1.263 -> r1.264)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c?r1=1.263&r2=1.264)
        planner.c (r1.257 -> r1.258)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/planner.c?r1=1.257&r2=1.258)
        setrefs.c (r1.150 -> r1.151)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/setrefs.c?r1=1.150&r2=1.151)
        subselect.c (r1.153 -> r1.154)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/subselect.c?r1=1.153&r2=1.154)
    pgsql/src/backend/optimizer/prep:
        prepunion.c (r1.174 -> r1.175)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/prep/prepunion.c?r1=1.174&r2=1.175)
    pgsql/src/backend/tcop:
        pquery.c (r1.131 -> r1.132)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/pquery.c?r1=1.131&r2=1.132)
    pgsql/src/backend/utils/adt:
        ruleutils.c (r1.308 -> r1.309)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/ruleutils.c?r1=1.308&r2=1.309)
    pgsql/src/backend/utils/cache:
        plancache.c (r1.28 -> r1.29)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/plancache.c?r1=1.28&r2=1.29)
    pgsql/src/include/commands:
        trigger.h (r1.75 -> r1.76)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/trigger.h?r1=1.75&r2=1.76)
    pgsql/src/include/executor:
        executor.h (r1.160 -> r1.161)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/executor/executor.h?r1=1.160&r2=1.161)
    pgsql/src/include/nodes:
        execnodes.h (r1.208 -> r1.209)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/execnodes.h?r1=1.208&r2=1.209)
        nodes.h (r1.228 -> r1.229)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/nodes.h?r1=1.228&r2=1.229)
        plannodes.h (r1.110 -> r1.111)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/plannodes.h?r1=1.110&r2=1.111)
        relation.h (r1.175 -> r1.176)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/relation.h?r1=1.175&r2=1.176)
    pgsql/src/include/optimizer:
        planmain.h (r1.118 -> r1.119)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/optimizer/planmain.h?r1=1.118&r2=1.119)

Added Files:
-----------
    pgsql/src/backend/executor:
        nodeModifyTable.c (r1.1)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeModifyTable.c?rev=1.1&content-type=text/x-cvsweb-markup)
    pgsql/src/include/executor:
        nodeModifyTable.h (r1.1)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/executor/nodeModifyTable.h?rev=1.1&content-type=text/x-cvsweb-markup)