Preliminary code review for domain CHECK constraints patch: add documentation,

make VALUE a non-reserved word again, use less invasive method of passing
ConstraintTestValue into transformExpr, fix problems with nested constraint
testing, do correct thing with NULL result from a constraint expression,
remove memory leak.  Domain checks still need much more work if we are going
to allow ALTER DOMAIN, however.

src/backend/parser/keywords.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.131 2002/11/15 02:50:08 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.132 2002/12/12 20:35:13 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -314,7 +314,6 @@ static const ScanKeyword ScanKeywords[] = {
 	{"vacuum", VACUUM},
 	{"valid", VALID},
 	{"validator", VALIDATOR},
-	{"value", VALUE},
 	{"values", VALUES},
 	{"varchar", VARCHAR},
 	{"varying", VARYING},