pgsql: Move exprType(), exprTypmod(), expression_tree_walker(), and

Log Message:
-----------
Move exprType(), exprTypmod(), expression_tree_walker(), and related routines
into nodes/nodeFuncs, so as to reduce wanton cross-subsystem #includes inside
the backend. There's probably more that should be done along this line,
but this is a start anyway.

Modified Files:
--------------
pgsql/src/backend/catalog:
dependency.c (r1.79 -> r1.80)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/dependency.c?r1=1.79&r2=1.80)
heap.c (r1.337 -> r1.338)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/heap.c?r1=1.337&r2=1.338)
index.c (r1.302 -> r1.303)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/index.c?r1=1.302&r2=1.303)
pgsql/src/backend/commands:
analyze.c (r1.124 -> r1.125)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/analyze.c?r1=1.124&r2=1.125)
indexcmds.c (r1.178 -> r1.179)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/indexcmds.c?r1=1.178&r2=1.179)
prepare.c (r1.89 -> r1.90)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/prepare.c?r1=1.89&r2=1.90)
tablecmds.c (r1.262 -> r1.263)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c?r1=1.262&r2=1.263)
view.c (r1.106 -> r1.107)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/view.c?r1=1.106&r2=1.107)
pgsql/src/backend/executor:
execMain.c (r1.312 -> r1.313)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execMain.c?r1=1.312&r2=1.313)
execQual.c (r1.232 -> r1.233)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execQual.c?r1=1.232&r2=1.233)
execTuples.c (r1.101 -> r1.102)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execTuples.c?r1=1.101&r2=1.102)
functions.c (r1.125 -> r1.126)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/functions.c?r1=1.125&r2=1.126)
nodeAgg.c (r1.159 -> r1.160)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeAgg.c?r1=1.159&r2=1.160)
pgsql/src/backend/nodes:
README (r1.3 -> r1.4)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/README?r1=1.3&r2=1.4)
nodeFuncs.c (r1.29 -> r1.30)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/nodeFuncs.c?r1=1.29&r2=1.30)
pgsql/src/backend/optimizer/path:
allpaths.c (r1.172 -> r1.173)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/allpaths.c?r1=1.172&r2=1.173)
costsize.c (r1.195 -> r1.196)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/costsize.c?r1=1.195&r2=1.196)
equivclass.c (r1.11 -> r1.12)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/equivclass.c?r1=1.11&r2=1.12)
pathkeys.c (r1.94 -> r1.95)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/pathkeys.c?r1=1.94&r2=1.95)
tidpath.c (r1.32 -> r1.33)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/tidpath.c?r1=1.32&r2=1.33)
pgsql/src/backend/optimizer/plan:
createplan.c (r1.245 -> r1.246)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c?r1=1.245&r2=1.246)
planagg.c (r1.42 -> r1.43)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/planagg.c?r1=1.42&r2=1.43)
setrefs.c (r1.142 -> r1.143)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/setrefs.c?r1=1.142&r2=1.143)
subselect.c (r1.138 -> r1.139)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/subselect.c?r1=1.138&r2=1.139)
pgsql/src/backend/optimizer/prep:
prepjointree.c (r1.53 -> r1.54)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/prep/prepjointree.c?r1=1.53&r2=1.54)
prepunion.c (r1.153 -> r1.154)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/prep/prepunion.c?r1=1.153&r2=1.154)
pgsql/src/backend/optimizer/util:
clauses.c (r1.263 -> r1.264)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c?r1=1.263&r2=1.264)
plancat.c (r1.149 -> r1.150)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/plancat.c?r1=1.149&r2=1.150)
predtest.c (r1.19 -> r1.20)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/predtest.c?r1=1.19&r2=1.20)
tlist.c (r1.81 -> r1.82)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/tlist.c?r1=1.81&r2=1.82)
var.c (r1.76 -> r1.77)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/var.c?r1=1.76&r2=1.77)
pgsql/src/backend/parser:
analyze.c (r1.376 -> r1.377)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/analyze.c?r1=1.376&r2=1.377)
parse_agg.c (r1.80 -> r1.81)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_agg.c?r1=1.80&r2=1.81)
parse_clause.c (r1.175 -> r1.176)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_clause.c?r1=1.175&r2=1.176)
parse_coerce.c (r2.163 -> r2.164)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_coerce.c?r1=2.163&r2=2.164)
parse_expr.c (r1.230 -> r1.231)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_expr.c?r1=1.230&r2=1.231)
parse_func.c (r1.204 -> r1.205)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_func.c?r1=1.204&r2=1.205)
parse_node.c (r1.100 -> r1.101)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_node.c?r1=1.100&r2=1.101)
parse_oper.c (r1.103 -> r1.104)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_oper.c?r1=1.103&r2=1.104)
parse_relation.c (r1.132 -> r1.133)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_relation.c?r1=1.132&r2=1.133)
parse_target.c (r1.160 -> r1.161)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_target.c?r1=1.160&r2=1.161)
parse_utilcmd.c (r2.14 -> r2.15)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_utilcmd.c?r1=2.14&r2=2.15)
pgsql/src/backend/rewrite:
rewriteDefine.c (r1.128 -> r1.129)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/rewrite/rewriteDefine.c?r1=1.128&r2=1.129)
rewriteHandler.c (r1.177 -> r1.178)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/rewrite/rewriteHandler.c?r1=1.177&r2=1.178)
rewriteManip.c (r1.110 -> r1.111)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/rewrite/rewriteManip.c?r1=1.110&r2=1.111)
pgsql/src/backend/utils/adt:
ruleutils.c (r1.280 -> r1.281)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/ruleutils.c?r1=1.280&r2=1.281)
selfuncs.c (r1.252 -> r1.253)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/selfuncs.c?r1=1.252&r2=1.253)
xml.c (r1.75 -> r1.76)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/xml.c?r1=1.75&r2=1.76)
pgsql/src/backend/utils/cache:
plancache.c (r1.19 -> r1.20)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/plancache.c?r1=1.19&r2=1.20)
pgsql/src/backend/utils/fmgr:
fmgr.c (r1.121 -> r1.122)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/fmgr/fmgr.c?r1=1.121&r2=1.122)
funcapi.c (r1.41 -> r1.42)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/fmgr/funcapi.c?r1=1.41&r2=1.42)
pgsql/src/include/nodes:
nodeFuncs.h (r1.26 -> r1.27)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/nodeFuncs.h?r1=1.26&r2=1.27)
pgsql/src/include/optimizer:
clauses.h (r1.93 -> r1.94)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/optimizer/clauses.h?r1=1.93&r2=1.94)
pgsql/src/include/parser:
parse_expr.h (r1.38 -> r1.39)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/parser/parse_expr.h?r1=1.38&r2=1.39)
pgsql/src/pl/plpgsql/src:
pl_exec.c (r1.216 -> r1.217)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_exec.c?r1=1.216&r2=1.217)