Tom Lane wrote:
>
> Andrew's idea of using the enum ordinal value would meet that test, but
> at least with the current layout of pg_enum it would be quite expensive
> to do the conversion in either direction --- you'd have to fetch
> multiple catalog rows. I think we'd have to add another column showing
> the ordinal value, and put an index on it, to make I/O reasonably fast.
> Doesn't really seem worth it.
>
>
>
Yeah. I think we should treat enums just as we do text, for this purpose.
Here's a patch (minus catalog bump) which I think does that.
cheers
andrew
Index: src/backend/commands/typecmds.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/commands/typecmds.c,v
retrieving revision 1.106
diff -c -r1.106 typecmds.c
*** src/backend/commands/typecmds.c 20 Jun 2007 18:15:49 -0000 1.106
--- src/backend/commands/typecmds.c 31 Aug 2007 14:31:05 -0000
***************
*** 1039,1046 ****
DEFAULT_TYPDELIM, /* array element delimiter */
F_ENUM_IN, /* input procedure */
F_ENUM_OUT, /* output procedure */
! InvalidOid, /* receive procedure - none */
! InvalidOid, /* send procedure - none */
InvalidOid, /* typmodin procedure - none */
InvalidOid, /* typmodout procedure - none */
InvalidOid, /* analyze procedure - default */
--- 1039,1046 ----
DEFAULT_TYPDELIM, /* array element delimiter */
F_ENUM_IN, /* input procedure */
F_ENUM_OUT, /* output procedure */
! F_ENUM_RECV, /* receive procedure */
! F_ENUM_SEND, /* send procedure */
InvalidOid, /* typmodin procedure - none */
InvalidOid, /* typmodout procedure - none */
InvalidOid, /* analyze procedure - default */
Index: src/backend/utils/adt/enum.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/utils/adt/enum.c,v
retrieving revision 1.3
diff -c -r1.3 enum.c
*** src/backend/utils/adt/enum.c 5 Jun 2007 21:31:06 -0000 1.3
--- src/backend/utils/adt/enum.c 31 Aug 2007 14:31:05 -0000
***************
*** 19,24 ****
--- 19,26 ----
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
+ #include "libpq/pqformat.h"
+ #include "miscadmin.h"
static ArrayType *enum_range_internal(Oid enumtypoid, Oid lower, Oid upper);
***************
*** 86,91 ****
--- 88,160 ----
PG_RETURN_CSTRING(result);
}
+ /* Binary I/O support */
+ Datum
+ enum_recv(PG_FUNCTION_ARGS)
+ {
+ StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
+ Oid enumtypoid = PG_GETARG_OID(1);
+ Oid enumoid;
+ HeapTuple tup;
+ char *name;
+ int nbytes;
+
+ name = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
+
+ /* must check length to prevent Assert failure within SearchSysCache */
+ if (strlen(name) >= NAMEDATALEN)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+ errmsg("invalid input value for enum %s: \"%s\"",
+ format_type_be(enumtypoid),
+ name)));
+
+ tup = SearchSysCache(ENUMTYPOIDNAME,
+ ObjectIdGetDatum(enumtypoid),
+ CStringGetDatum(name),
+ 0, 0);
+ if (!HeapTupleIsValid(tup))
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+ errmsg("invalid input value for enum %s: \"%s\"",
+ format_type_be(enumtypoid),
+ name)));
+
+ enumoid = HeapTupleGetOid(tup);
+
+ ReleaseSysCache(tup);
+
+ pfree(name);
+
+ PG_RETURN_OID(enumoid);
+ }
+
+ Datum
+ enum_send(PG_FUNCTION_ARGS)
+ {
+ Oid enumval = PG_GETARG_OID(0);
+ StringInfoData buf;
+ HeapTuple tup;
+ Form_pg_enum en;
+
+ tup = SearchSysCache(ENUMOID,
+ ObjectIdGetDatum(enumval),
+ 0, 0, 0);
+ if (!HeapTupleIsValid(tup))
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
+ errmsg("invalid internal value for enum: %u",
+ enumval)));
+ en = (Form_pg_enum) GETSTRUCT(tup);
+
+ pq_begintypsend(&buf);
+ pq_sendtext(&buf, NameStr(en->enumlabel), strlen(NameStr(en->enumlabel)));
+
+ ReleaseSysCache(tup);
+
+ PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
+ }
+
/* Comparison functions and related */
Datum
Index: src/include/catalog/pg_proc.h
===================================================================
RCS file: /cvsroot/pgsql/src/include/catalog/pg_proc.h,v
retrieving revision 1.465
diff -c -r1.465 pg_proc.h
*** src/include/catalog/pg_proc.h 27 Aug 2007 01:39:24 -0000 1.465
--- src/include/catalog/pg_proc.h 31 Aug 2007 14:31:06 -0000
***************
*** 4134,4139 ****
--- 4134,4141 ----
DATA(insert OID = 3529 ( enum_last PGNSP PGUID 12 1 0 f f f f s 1 3500 "3500" _null_ _null_ _null_ enum_last
-_null_ ));
DATA(insert OID = 3530 ( enum_range PGNSP PGUID 12 1 0 f f f f s 2 2277 "3500 3500" _null_ _null_ _null_
enum_range_bounds- _null_ ));
DATA(insert OID = 3531 ( enum_range PGNSP PGUID 12 1 0 f f f f s 1 2277 "3500" _null_ _null_ _null_
enum_range_all- _null_ ));
+ DATA(insert OID = 3532 ( enum_recv PGNSP PGUID 12 1 0 f f t f s 2 3500 "2275 26" _null_ _null_ _null_
enum_recv- _null_ ));
+ DATA(insert OID = 3533 ( enum_send PGNSP PGUID 12 1 0 f f t f s 1 17 "3500" _null_ _null_ _null_ enum_send
-_null_ ));
/* text search stuff */
DATA(insert OID = 3610 ( tsvectorin PGNSP PGUID 12 1 0 f f t f i 1 3614 "2275" _null_ _null_ _null_
tsvectorin- _null_ ));
Index: src/include/utils/builtins.h
===================================================================
RCS file: /cvsroot/pgsql/src/include/utils/builtins.h,v
retrieving revision 1.301
diff -c -r1.301 builtins.h
*** src/include/utils/builtins.h 27 Aug 2007 01:39:25 -0000 1.301
--- src/include/utils/builtins.h 31 Aug 2007 14:31:07 -0000
***************
*** 107,112 ****
--- 107,114 ----
/* enum.c */
extern Datum enum_in(PG_FUNCTION_ARGS);
extern Datum enum_out(PG_FUNCTION_ARGS);
+ extern Datum enum_recv(PG_FUNCTION_ARGS);
+ extern Datum enum_send(PG_FUNCTION_ARGS);
extern Datum enum_lt(PG_FUNCTION_ARGS);
extern Datum enum_le(PG_FUNCTION_ARGS);
extern Datum enum_eq(PG_FUNCTION_ARGS);
