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Add to_regprocedure() and to_regoperator().

Browse Source 
These are natural complements to the functions added by commit
0886fc6a5c, but they weren't included
in the original patch for some reason.  Add them.

Patch by me, per a complaint by Tom Lane.  Review by Tatsuo
Ishii.
This commit is contained in:
Robert Haas 2014-04-16 12:21:43 -04:00
parent 1a81daab8b
commit dfc0219f64
7 changed files with 199 additions and 5 deletions
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28
doc/src/sgml/func.sgml
View File

@ -15293,10 +15293,18 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<primary>to_regproc</primary>
</indexterm>
<indexterm>
<primary>to_regprocedure</primary>
</indexterm>
<indexterm>
<primary>to_regoper</primary>
</indexterm>
<indexterm>
<primary>to_regoperator</primary>
</indexterm>
<indexterm>
<primary>to_regtype</primary>
</indexterm>
@ -15481,11 +15489,21 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<entry><type>regproc</type></entry>
<entry>get the oid of the named function</entry>
</row>
<row>
<entry><literal><function>to_regprocedure(<parameter>func_name</parameter>)</function></literal></entry>
<entry><type>regprocedure</type></entry>
<entry>get the oid of the named function</entry>
</row>
<row>
<entry><literal><function>to_regoper(<parameter>operator_name</parameter>)</function></literal></entry>
<entry><type>regoper</type></entry>
<entry>get the oid of the named operator</entry>
</row>
<row>
<entry><literal><function>to_regoperator(<parameter>operator_name</parameter>)</function></literal></entry>
<entry><type>regoperator</type></entry>
<entry>get the oid of the named operator</entry>
</row>
<row>
<entry><literal><function>to_regtype(<parameter>type_name</parameter>)</function></literal></entry>
<entry><type>regtype</type></entry>
@ -15658,10 +15676,12 @@ SELECT collation for ('foo' COLLATE "de_DE");
<para>
The <function>to_regclass</function>, <function>to_regproc</function>,
<function>to_regoper</function> and <function>to_regtype</function>
translate relation, function, operator, and type names to objects of
type <type>regclass</>, <type>regproc</>, <type>regoper</> and
<type>regtype</>, respectively. These functions differ from a cast from
<function>to_regprocedure</function>, <function>to_regoper</function>,
<function>to_regoperator</function>, and <function>to_regtype</function>
functions translate relation, function, operator, and type names to objects
of type <type>regclass</>, <type>regproc</>, <type>regprocedure</type>,
<type>regoper</>, <type>regoperator</type>, and <type>regtype</>,
respectively. These functions differ from a cast from
text in that they don't accept a numeric OID, and that they return null
rather than throwing an error if the name is not found (or, for
<function>to_regproc</function> and <function>to_regoper</function>, if

71
src/backend/utils/adt/regproc.c
View File

@ -322,6 +322,38 @@ regprocedurein(PG_FUNCTION_ARGS)
PG_RETURN_OID(result);
}
/*
* to_regprocedure - converts "proname(args)" to proc OID
*
* If the name is not found, we return NULL.
*/
Datum
to_regprocedure(PG_FUNCTION_ARGS)
{
char *pro_name = PG_GETARG_CSTRING(0);
List *names;
int nargs;
Oid argtypes[FUNC_MAX_ARGS];
FuncCandidateList clist;
/*
* Parse the name and arguments, look up potential matches in the current
* namespace search list, and scan to see which one exactly matches the
* given argument types. (There will not be more than one match.)
*/
parseNameAndArgTypes(pro_name, false, &names, &nargs, argtypes);
clist = FuncnameGetCandidates(names, nargs, NIL, false, false, true);
for (; clist; clist = clist->next)
{
if (memcmp(clist->args, argtypes, nargs * sizeof(Oid)) == 0)
PG_RETURN_OID(clist->oid);
}
PG_RETURN_NULL();
}
/*
* format_procedure - converts proc OID to "pro_name(args)"
*
@ -721,6 +753,45 @@ regoperatorin(PG_FUNCTION_ARGS)
PG_RETURN_OID(result);
}
/*
* to_regoperator - converts "oprname(args)" to operator OID
*
* If the name is not found, we return NULL.
*/
Datum
to_regoperator(PG_FUNCTION_ARGS)
{
char *opr_name_or_oid = PG_GETARG_CSTRING(0);
Oid result;
List *names;
int nargs;
Oid argtypes[FUNC_MAX_ARGS];
/*
* Parse the name and arguments, look up potential matches in the current
* namespace search list, and scan to see which one exactly matches the
* given argument types. (There will not be more than one match.)
*/
parseNameAndArgTypes(opr_name_or_oid, true, &names, &nargs, argtypes);
if (nargs == 1)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_PARAMETER),
errmsg("missing argument"),
errhint("Use NONE to denote the missing argument of a unary operator.")));
if (nargs != 2)
ereport(ERROR,
(errcode(ERRCODE_TOO_MANY_ARGUMENTS),
errmsg("too many arguments"),
errhint("Provide two argument types for operator.")));
result = OpernameGetOprid(names, argtypes[0], argtypes[1]);
if (!OidIsValid(result))
PG_RETURN_NULL();
PG_RETURN_OID(result);
}
/*
* format_operator - converts operator OID to "opr_name(args)"
*

2
src/include/catalog/catversion.h
View File

@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 201404123
#define CATALOG_VERSION_NO 201404161
#endif

4
src/include/catalog/pg_proc.h
View File

@ -175,6 +175,8 @@ DATA(insert OID = 45 ( regprocout PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0
DESCR("I/O");
DATA(insert OID = 3494 ( to_regproc PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 24 "2275" _null_ _null_ _null_ _null_ to_regproc _null_ _null_ _null_ ));
DESCR("convert proname to regproc");
DATA(insert OID = 3479 ( to_regprocedure PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 2202 "2275" _null_ _null_ _null_ _null_ to_regprocedure _null_ _null_ _null_ ));
DESCR("convert proname to regprocedure");
DATA(insert OID = 46 ( textin PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 25 "2275" _null_ _null_ _null_ _null_ textin _null_ _null_ _null_ ));
DESCR("I/O");
DATA(insert OID = 47 ( textout PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 2275 "25" _null_ _null_ _null_ _null_ textout _null_ _null_ _null_ ));
@ -3351,6 +3353,8 @@ DATA(insert OID = 2215 ( regoperout PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 2
DESCR("I/O");
DATA(insert OID = 3492 ( to_regoper PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 2203 "2275" _null_ _null_ _null_ _null_ to_regoper _null_ _null_ _null_ ));
DESCR("convert operator name to regoper");
DATA(insert OID = 3476 ( to_regoperator PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 2204 "2275" _null_ _null_ _null_ _null_ to_regoperator _null_ _null_ _null_ ));
DESCR("convert operator name to regoperator");
DATA(insert OID = 2216 ( regoperatorin PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 2204 "2275" _null_ _null_ _null_ _null_ regoperatorin _null_ _null_ _null_ ));
DESCR("I/O");
DATA(insert OID = 2217 ( regoperatorout PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 2275 "2204" _null_ _null_ _null_ _null_ regoperatorout _null_ _null_ _null_ ));

2
src/include/utils/builtins.h
View File

@ -602,6 +602,7 @@ extern char *regexp_fixed_prefix(text *text_re, bool case_insensitive,
extern Datum regprocin(PG_FUNCTION_ARGS);
extern Datum regprocout(PG_FUNCTION_ARGS);
extern Datum to_regproc(PG_FUNCTION_ARGS);
extern Datum to_regprocedure(PG_FUNCTION_ARGS);
extern Datum regprocrecv(PG_FUNCTION_ARGS);
extern Datum regprocsend(PG_FUNCTION_ARGS);
extern Datum regprocedurein(PG_FUNCTION_ARGS);
@ -613,6 +614,7 @@ extern Datum regoperout(PG_FUNCTION_ARGS);
extern Datum regoperrecv(PG_FUNCTION_ARGS);
extern Datum regopersend(PG_FUNCTION_ARGS);
extern Datum to_regoper(PG_FUNCTION_ARGS);
extern Datum to_regoperator(PG_FUNCTION_ARGS);
extern Datum regoperatorin(PG_FUNCTION_ARGS);
extern Datum regoperatorout(PG_FUNCTION_ARGS);
extern Datum regoperatorrecv(PG_FUNCTION_ARGS);

82
src/test/regress/expected/regproc.out
View File

@ -9,12 +9,24 @@ SELECT regoper('||/');
||/
(1 row)
SELECT regoperator('+(int4,int4)');
regoperator
--------------------
+(integer,integer)
(1 row)
SELECT regproc('now');
regproc
---------
now
(1 row)
SELECT regprocedure('abs(numeric)');
regprocedure
--------------
abs(numeric)
(1 row)
SELECT regclass('pg_class');
regclass
----------
@ -33,12 +45,24 @@ SELECT to_regoper('||/');
||/
(1 row)
SELECT to_regoperator('+(int4,int4)');
to_regoperator
--------------------
+(integer,integer)
(1 row)
SELECT to_regproc('now');
to_regproc
------------
now
(1 row)
SELECT to_regprocedure('abs(numeric)');
to_regprocedure
-----------------
abs(numeric)
(1 row)
SELECT to_regclass('pg_class');
to_regclass
-------------
@ -58,12 +82,24 @@ SELECT regoper('pg_catalog.||/');
||/
(1 row)
SELECT regoperator('pg_catalog.+(int4,int4)');
regoperator
--------------------
+(integer,integer)
(1 row)
SELECT regproc('pg_catalog.now');
regproc
---------
now
(1 row)
SELECT regprocedure('pg_catalog.abs(numeric)');
regprocedure
--------------
abs(numeric)
(1 row)
SELECT regclass('pg_catalog.pg_class');
regclass
----------
@ -88,6 +124,12 @@ SELECT to_regproc('pg_catalog.now');
now
(1 row)
SELECT to_regprocedure('pg_catalog.abs(numeric)');
to_regprocedure
-----------------
abs(numeric)
(1 row)
SELECT to_regclass('pg_catalog.pg_class');
to_regclass
-------------
@ -106,10 +148,18 @@ SELECT regoper('||//');
ERROR: operator does not exist: ||//
LINE 3: SELECT regoper('||//');
^
SELECT regoperator('++(int4,int4)');
ERROR: operator does not exist: ++(int4,int4)
LINE 1: SELECT regoperator('++(int4,int4)');
^
SELECT regproc('know');
ERROR: function "know" does not exist
LINE 1: SELECT regproc('know');
^
SELECT regprocedure('absinthe(numeric)');
ERROR: function "absinthe(numeric)" does not exist
LINE 1: SELECT regprocedure('absinthe(numeric)');
^
SELECT regclass('pg_classes');
ERROR: relation "pg_classes" does not exist
LINE 1: SELECT regclass('pg_classes');
@ -123,10 +173,18 @@ SELECT regoper('ng_catalog.||/');
ERROR: schema "ng_catalog" does not exist
LINE 1: SELECT regoper('ng_catalog.||/');
^
SELECT regoperator('ng_catalog.+(int4,int4)');
ERROR: operator does not exist: ng_catalog.+(int4,int4)
LINE 1: SELECT regoperator('ng_catalog.+(int4,int4)');
^
SELECT regproc('ng_catalog.now');
ERROR: schema "ng_catalog" does not exist
LINE 1: SELECT regproc('ng_catalog.now');
^
SELECT regprocedure('ng_catalog.abs(numeric)');
ERROR: schema "ng_catalog" does not exist
LINE 1: SELECT regprocedure('ng_catalog.abs(numeric)');
^
SELECT regclass('ng_catalog.pg_class');
ERROR: schema "ng_catalog" does not exist
LINE 1: SELECT regclass('ng_catalog.pg_class');
@ -143,12 +201,24 @@ SELECT to_regoper('||//');
(1 row)
SELECT to_regoperator('++(int4,int4)');
to_regoperator
----------------
(1 row)
SELECT to_regproc('know');
to_regproc
------------
(1 row)
SELECT to_regprocedure('absinthe(numeric)');
to_regprocedure
-----------------
(1 row)
SELECT to_regclass('pg_classes');
to_regclass
-------------
@ -168,12 +238,24 @@ SELECT to_regoper('ng_catalog.||/');
(1 row)
SELECT to_regoperator('ng_catalog.+(int4,int4)');
to_regoperator
----------------
(1 row)
SELECT to_regproc('ng_catalog.now');
to_regproc
------------
(1 row)
SELECT to_regprocedure('ng_catalog.abs(numeric)');
to_regprocedure
-----------------
(1 row)
SELECT to_regclass('ng_catalog.pg_class');
to_regclass
-------------

15
src/test/regress/sql/regproc.sql
View File

@ -7,24 +7,31 @@
-- without schemaname
SELECT regoper('||/');
SELECT regoperator('+(int4,int4)');
SELECT regproc('now');
SELECT regprocedure('abs(numeric)');
SELECT regclass('pg_class');
SELECT regtype('int4');
SELECT to_regoper('||/');
SELECT to_regoperator('+(int4,int4)');
SELECT to_regproc('now');
SELECT to_regprocedure('abs(numeric)');
SELECT to_regclass('pg_class');
SELECT to_regtype('int4');
-- with schemaname
SELECT regoper('pg_catalog.||/');
SELECT regoperator('pg_catalog.+(int4,int4)');
SELECT regproc('pg_catalog.now');
SELECT regprocedure('pg_catalog.abs(numeric)');
SELECT regclass('pg_catalog.pg_class');
SELECT regtype('pg_catalog.int4');
SELECT to_regoper('pg_catalog.||/');
SELECT to_regproc('pg_catalog.now');
SELECT to_regprocedure('pg_catalog.abs(numeric)');
SELECT to_regclass('pg_catalog.pg_class');
SELECT to_regtype('pg_catalog.int4');
@ -33,14 +40,18 @@ SELECT to_regtype('pg_catalog.int4');
-- without schemaname
SELECT regoper('||//');
SELECT regoperator('++(int4,int4)');
SELECT regproc('know');
SELECT regprocedure('absinthe(numeric)');
SELECT regclass('pg_classes');
SELECT regtype('int3');
-- with schemaname
SELECT regoper('ng_catalog.||/');
SELECT regoperator('ng_catalog.+(int4,int4)');
SELECT regproc('ng_catalog.now');
SELECT regprocedure('ng_catalog.abs(numeric)');
SELECT regclass('ng_catalog.pg_class');
SELECT regtype('ng_catalog.int4');
@ -49,13 +60,17 @@ SELECT regtype('ng_catalog.int4');
-- without schemaname
SELECT to_regoper('||//');
SELECT to_regoperator('++(int4,int4)');
SELECT to_regproc('know');
SELECT to_regprocedure('absinthe(numeric)');
SELECT to_regclass('pg_classes');
SELECT to_regtype('int3');
-- with schemaname
SELECT to_regoper('ng_catalog.||/');
SELECT to_regoperator('ng_catalog.+(int4,int4)');
SELECT to_regproc('ng_catalog.now');
SELECT to_regprocedure('ng_catalog.abs(numeric)');
SELECT to_regclass('ng_catalog.pg_class');
SELECT to_regtype('ng_catalog.int4');