pgsql/src backend/commands/explain.c backend/n ...

CVSROOT:    /cvsroot
Module name:    pgsql
Changes by:    tgl@postgresql.org    02/03/11 19:52:11

Modified files:
    src/backend/commands: explain.c
    src/backend/nodes: copyfuncs.c equalfuncs.c outfuncs.c
                       readfuncs.c
    src/backend/optimizer/path: costsize.c joinpath.c joinrels.c
                                pathkeys.c
    src/backend/optimizer/plan: createplan.c initsplan.c planmain.c
                                planner.c setrefs.c
    src/backend/optimizer/prep: prepunion.c
    src/backend/optimizer/util: clauses.c relnode.c var.c
    src/backend/parser: analyze.c parse_clause.c parse_expr.c
                        parse_func.c parse_node.c parse_relation.c
                        parse_target.c
    src/backend/rewrite: rewriteHandler.c rewriteManip.c
    src/backend/utils/adt: ruleutils.c
    src/include/catalog: catversion.h
    src/include/nodes: parsenodes.h plannodes.h primnodes.h
                       relation.h
    src/include/optimizer: pathnode.h planmain.h var.h
    src/include/parser: parse_relation.h parsetree.h
    src/include/utils: builtins.h
    src/test/regress/expected: join.out
    src/test/regress/sql: join.sql

Log message:
    Restructure representation of join alias variables.  An explicit JOIN
    now has an RTE of its own, and references to its outputs now are Vars
    referencing the JOIN RTE, rather than CASE-expressions.  This allows
    reverse-listing in ruleutils.c to use the correct alias easily, rather
    than painfully reverse-engineering the alias namespace as it used to do.
    Also, nested FULL JOINs work correctly, because the result of the inner
    joins are simple Vars that the planner can cope with.  This fixes a bug
    reported a couple times now, notably by Tatsuo on 18-Nov-01.  The alias
    Vars are expanded into COALESCE expressions where needed at the very end
    of planning, rather than during parsing.
    Also, beginnings of support for showing plan qualifier expressions in
    EXPLAIN.  There are probably still cases that need work.
    initdb forced due to change of stored-rule representation.