pgsql: Support enum data types.

Log Message:
-----------
Support enum data types. Along the way, use macros for the values of
pg_type.typtype whereever practical. Tom Dunstan, with some kibitzing
from Tom Lane.

Modified Files:
--------------
pgsql/doc/src/sgml:
catalogs.sgml (r2.148 -> r2.149)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/catalogs.sgml.diff?r1=2.148&r2=2.149)
datatype.sgml (r1.191 -> r1.192)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/datatype.sgml.diff?r1=1.191&r2=1.192)
extend.sgml (r1.33 -> r1.34)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/extend.sgml.diff?r1=1.33&r2=1.34)
func.sgml (r1.372 -> r1.373)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.372&r2=1.373)
plpgsql.sgml (r1.105 -> r1.106)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plpgsql.sgml.diff?r1=1.105&r2=1.106)
xfunc.sgml (r1.126 -> r1.127)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xfunc.sgml.diff?r1=1.126&r2=1.127)
pgsql/doc/src/sgml/ref:
create_type.sgml (r1.68 -> r1.69)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_type.sgml.diff?r1=1.68&r2=1.69)
pgsql/src/backend/access/hash:
hashfunc.c (r1.50 -> r1.51)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/hash/hashfunc.c.diff?r1=1.50&r2=1.51)
pgsql/src/backend/catalog:
Makefile (r1.63 -> r1.64)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/Makefile.diff?r1=1.63&r2=1.64)
heap.c (r1.317 -> r1.318)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/heap.c.diff?r1=1.317&r2=1.318)
pg_aggregate.c (r1.85 -> r1.86)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_aggregate.c.diff?r1=1.85&r2=1.86)
pg_proc.c (r1.143 -> r1.144)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_proc.c.diff?r1=1.143&r2=1.144)
pg_type.c (r1.110 -> r1.111)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_type.c.diff?r1=1.110&r2=1.111)
pgsql/src/backend/commands:
aggregatecmds.c (r1.42 -> r1.43)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/aggregatecmds.c.diff?r1=1.42&r2=1.43)
functioncmds.c (r1.82 -> r1.83)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/functioncmds.c.diff?r1=1.82&r2=1.83)
typecmds.c (r1.100 -> r1.101)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/typecmds.c.diff?r1=1.100&r2=1.101)
pgsql/src/backend/executor:
functions.c (r1.112 -> r1.113)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/functions.c.diff?r1=1.112&r2=1.113)
nodeAgg.c (r1.151 -> r1.152)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeAgg.c.diff?r1=1.151&r2=1.152)
pgsql/src/backend/nodes:
copyfuncs.c (r1.372 -> r1.373)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c.diff?r1=1.372&r2=1.373)
equalfuncs.c (r1.303 -> r1.304)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/equalfuncs.c.diff?r1=1.303&r2=1.304)
pgsql/src/backend/optimizer/util:
clauses.c (r1.240 -> r1.241)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c.diff?r1=1.240&r2=1.241)
pgsql/src/backend/parser:
gram.y (r2.584 -> r2.585)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.584&r2=2.585)
keywords.c (r1.185 -> r1.186)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/keywords.c.diff?r1=1.185&r2=1.186)
parse_coerce.c (r2.152 -> r2.153)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_coerce.c.diff?r1=2.152&r2=2.153)
parse_expr.c (r1.215 -> r1.216)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_expr.c.diff?r1=1.215&r2=1.216)
parse_oper.c (r1.94 -> r1.95)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_oper.c.diff?r1=1.94&r2=1.95)
parse_type.c (r1.87 -> r1.88)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_type.c.diff?r1=1.87&r2=1.88)
pgsql/src/backend/tcop:
utility.c (r1.275 -> r1.276)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/utility.c.diff?r1=1.275&r2=1.276)
pgsql/src/backend/utils/adt:
Makefile (r1.63 -> r1.64)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/Makefile.diff?r1=1.63&r2=1.64)
format_type.c (r1.46 -> r1.47)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/format_type.c.diff?r1=1.46&r2=1.47)
pseudotypes.c (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/pseudotypes.c.diff?r1=1.18&r2=1.19)
xml.c (r1.38 -> r1.39)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/xml.c.diff?r1=1.38&r2=1.39)
pgsql/src/backend/utils/cache:
lsyscache.c (r1.150 -> r1.151)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/lsyscache.c.diff?r1=1.150&r2=1.151)
syscache.c (r1.111 -> r1.112)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/syscache.c.diff?r1=1.111&r2=1.112)
typcache.c (r1.24 -> r1.25)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/typcache.c.diff?r1=1.24&r2=1.25)
pgsql/src/backend/utils/fmgr:
funcapi.c (r1.33 -> r1.34)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/fmgr/funcapi.c.diff?r1=1.33&r2=1.34)
pgsql/src/bin/pg_dump:
pg_dump.c (r1.465 -> r1.466)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.c.diff?r1=1.465&r2=1.466)
pgsql/src/include/access:
hash.h (r1.76 -> r1.77)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/hash.h.diff?r1=1.76&r2=1.77)
pgsql/src/include/catalog:
catversion.h (r1.398 -> r1.399)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h.diff?r1=1.398&r2=1.399)
indexing.h (r1.98 -> r1.99)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/indexing.h.diff?r1=1.98&r2=1.99)
pg_aggregate.h (r1.61 -> r1.62)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_aggregate.h.diff?r1=1.61&r2=1.62)
pg_amop.h (r1.79 -> r1.80)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_amop.h.diff?r1=1.79&r2=1.80)
pg_amproc.h (r1.63 -> r1.64)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_amproc.h.diff?r1=1.63&r2=1.64)
pg_cast.h (r1.31 -> r1.32)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_cast.h.diff?r1=1.31&r2=1.32)
pg_opclass.h (r1.74 -> r1.75)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_opclass.h.diff?r1=1.74&r2=1.75)
pg_operator.h (r1.150 -> r1.151)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_operator.h.diff?r1=1.150&r2=1.151)
pg_opfamily.h (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_opfamily.h.diff?r1=1.3&r2=1.4)
pg_proc.h (r1.453 -> r1.454)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.453&r2=1.454)
pg_type.h (r1.180 -> r1.181)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_type.h.diff?r1=1.180&r2=1.181)
pgsql/src/include/commands:
typecmds.h (r1.17 -> r1.18)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/typecmds.h.diff?r1=1.17&r2=1.18)
pgsql/src/include/nodes:
nodes.h (r1.197 -> r1.198)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/nodes.h.diff?r1=1.197&r2=1.198)
parsenodes.h (r1.343 -> r1.344)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/parsenodes.h.diff?r1=1.343&r2=1.344)
pgsql/src/include/parser:
parse_type.h (r1.35 -> r1.36)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/parser/parse_type.h.diff?r1=1.35&r2=1.36)
pgsql/src/include/utils:
builtins.h (r1.290 -> r1.291)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/builtins.h.diff?r1=1.290&r2=1.291)
lsyscache.h (r1.117 -> r1.118)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/lsyscache.h.diff?r1=1.117&r2=1.118)
syscache.h (r1.68 -> r1.69)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/syscache.h.diff?r1=1.68&r2=1.69)
pgsql/src/pl/plperl:
plperl.c (r1.127 -> r1.128)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/plperl.c.diff?r1=1.127&r2=1.128)
pgsql/src/pl/plpgsql/src:
pl_comp.c (r1.113 -> r1.114)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_comp.c.diff?r1=1.113&r2=1.114)
pl_exec.c (r1.192 -> r1.193)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_exec.c.diff?r1=1.192&r2=1.193)
pl_handler.c (r1.36 -> r1.37)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_handler.c.diff?r1=1.36&r2=1.37)
pgsql/src/pl/plpython:
plpython.c (r1.96 -> r1.97)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/plpython.c.diff?r1=1.96&r2=1.97)
pgsql/src/pl/tcl:
pltcl.c (r1.111 -> r1.112)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/tcl/pltcl.c.diff?r1=1.111&r2=1.112)
pgsql/src/test/regress/expected:
polymorphism.out (r1.9 -> r1.10)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/polymorphism.out.diff?r1=1.9&r2=1.10)
rangefuncs.out (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/rangefuncs.out.diff?r1=1.16&r2=1.17)
sanity_check.out (r1.34 -> r1.35)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/sanity_check.out.diff?r1=1.34&r2=1.35)
type_sanity.out (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/type_sanity.out.diff?r1=1.28&r2=1.29)
pgsql/src/test/regress:
parallel_schedule (r1.41 -> r1.42)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/parallel_schedule.diff?r1=1.41&r2=1.42)
serial_schedule (r1.38 -> r1.39)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/serial_schedule.diff?r1=1.38&r2=1.39)
pgsql/src/test/regress/sql:
type_sanity.sql (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/type_sanity.sql.diff?r1=1.28&r2=1.29)

Added Files:
-----------
pgsql/src/backend/catalog:
pg_enum.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_enum.c?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql/src/backend/utils/adt:
enum.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/enum.c?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql/src/include/catalog:
pg_enum.h (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_enum.h?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql/src/test/regress/expected:
enum.out (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/enum.out?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql/src/test/regress/sql:
enum.sql (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/enum.sql?rev=1.1&content-type=text/x-cvsweb-markup)