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Allow binary I/O of type "void".

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void_send is useful for the same reason that void_out doesn't throw error,
namely that someone might do "select void_returning_func(...)"  from a
client that prefers to operate in binary mode.  The void_recv function may
or may not have any practical use, but we provide it for symmetry.

Radosław Smogura
This commit is contained in:
Tom Lane 2011-02-22 13:08:22 -05:00
parent edb382179d
commit 1ab9b012bd
5 changed files with 36 additions and 2 deletions
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28
src/backend/utils/adt/pseudotypes.c
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@ -212,6 +212,34 @@ void_out(PG_FUNCTION_ARGS)
PG_RETURN_CSTRING(pstrdup(""));
}
/*
* void_recv - binary input routine for pseudo-type VOID.
*
* Note that since we consume no bytes, an attempt to send anything but
* an empty string will result in an "invalid message format" error.
*/
Datum
void_recv(PG_FUNCTION_ARGS)
{
PG_RETURN_VOID();
}
/*
* void_send - binary output routine for pseudo-type VOID.
*
* We allow this so that "SELECT function_returning_void(...)" works
* even when binary output is requested.
*/
Datum
void_send(PG_FUNCTION_ARGS)
{
StringInfoData buf;
/* send an empty string */
pq_begintypsend(&buf);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* trigger_in - input routine for pseudo-type TRIGGER.

2
src/include/catalog/catversion.h
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@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 201102191
#define CATALOG_VERSION_NO 201102221
#endif

4
src/include/catalog/pg_proc.h
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@ -4226,6 +4226,10 @@ DATA(insert OID = 2502 ( anyarray_recv PGNSP PGUID 12 1 0 0 f f f t f s 1 0
DESCR("I/O");
DATA(insert OID = 2503 ( anyarray_send PGNSP PGUID 12 1 0 0 f f f t f s 1 0 17 "2277" _null_ _null_ _null_ _null_ anyarray_send _null_ _null_ _null_ ));
DESCR("I/O");
DATA(insert OID = 3120 ( void_recv PGNSP PGUID 12 1 0 0 f f f t f i 1 0 2278 "2281" _null_ _null_ _null_ _null_ void_recv _null_ _null_ _null_ ));
DESCR("I/O");
DATA(insert OID = 3121 ( void_send PGNSP PGUID 12 1 0 0 f f f t f i 1 0 17 "2278" _null_ _null_ _null_ _null_ void_send _null_ _null_ _null_ ));
DESCR("I/O");
/* System-view support functions with pretty-print option */
DATA(insert OID = 2504 ( pg_get_ruledef PGNSP PGUID 12 1 0 0 f f f t f s 2 0 25 "26 16" _null_ _null_ _null_ _null_ pg_get_ruledef_ext _null_ _null_ _null_ ));

2
src/include/catalog/pg_type.h
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@ -615,7 +615,7 @@ DATA(insert OID = 2276 ( any PGNSP PGUID 4 t p P f t \054 0 0 0 any_in any_ou
#define ANYOID 2276
DATA(insert OID = 2277 ( anyarray PGNSP PGUID -1 f p P f t \054 0 0 0 anyarray_in anyarray_out anyarray_recv anyarray_send - - - d x f 0 -1 0 0 _null_ _null_ ));
#define ANYARRAYOID 2277
DATA(insert OID = 2278 ( void PGNSP PGUID 4 t p P f t \054 0 0 0 void_in void_out - - - - - i p f 0 -1 0 0 _null_ _null_ ));
DATA(insert OID = 2278 ( void PGNSP PGUID 4 t p P f t \054 0 0 0 void_in void_out void_recv void_send - - - i p f 0 -1 0 0 _null_ _null_ ));
#define VOIDOID 2278
DATA(insert OID = 2279 ( trigger PGNSP PGUID 4 t p P f t \054 0 0 0 trigger_in trigger_out - - - - - i p f 0 -1 0 0 _null_ _null_ ));
#define TRIGGEROID 2279

2
src/include/utils/builtins.h
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@ -504,6 +504,8 @@ extern Datum anyenum_in(PG_FUNCTION_ARGS);
extern Datum anyenum_out(PG_FUNCTION_ARGS);
extern Datum void_in(PG_FUNCTION_ARGS);
extern Datum void_out(PG_FUNCTION_ARGS);
extern Datum void_recv(PG_FUNCTION_ARGS);
extern Datum void_send(PG_FUNCTION_ARGS);
extern Datum trigger_in(PG_FUNCTION_ARGS);
extern Datum trigger_out(PG_FUNCTION_ARGS);
extern Datum language_handler_in(PG_FUNCTION_ARGS);