Here's the patch with an 'array_elemtype' procedure which returns array's
element type as an oid. It should apply to the commit fc995b. I wasn't sure if
I shoud start a new thread.
--
Dmitry Ivanov
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index e08bf60..671c6d5 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -11695,6 +11695,9 @@ SELECT NULLIF(value, '(none)') ...
<primary>array_dims</primary>
</indexterm>
<indexterm>
+ <primary>array_elemtype</primary>
+ </indexterm>
+ <indexterm>
<primary>array_fill</primary>
</indexterm>
<indexterm>
@@ -11794,6 +11797,17 @@ SELECT NULLIF(value, '(none)') ...
<row>
<entry>
<literal>
+ <function>array_elemtype</function>(<type>anyarray</type>)
+ </literal>
+ </entry>
+ <entry><type>oid</type></entry>
+ <entry>returns the element type of an array as oid</entry>
+ <entry><literal>array_elemtype(ARRAY[1,2,3])</literal></entry>
+ <entry><literal>23</literal></entry>
+ </row>
+ <row>
+ <entry>
+ <literal>
<function>array_fill</function>(<type>anyelement</type>, <type>int[]</type>,
<optional>, <type>int[]</type></optional>)
</literal>
diff --git a/src/backend/utils/adt/arrayfuncs.c b/src/backend/utils/adt/arrayfuncs.c
index 72d308a..c2883e9 100644
--- a/src/backend/utils/adt/arrayfuncs.c
+++ b/src/backend/utils/adt/arrayfuncs.c
@@ -158,6 +158,18 @@ static int width_bucket_array_variable(Datum operand,
Oid collation,
TypeCacheEntry *typentry);
+/*
+ * array_elemtype :
+ * returns the element type of the array
+ * pointed to by "v" as an Oid.
+ */
+Datum
+array_elemtype(PG_FUNCTION_ARGS)
+{
+ AnyArrayType *v = PG_GETARG_ANY_ARRAY(0);
+
+ return ObjectIdGetDatum(AARR_ELEMTYPE(v));
+}
/*
* array_in :
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index d8640db..de55c01 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -892,6 +892,8 @@ DATA(insert OID = 2092 ( array_upper PGNSP PGUID 12 1 0 0 0 f f f f t f i s
DESCR("array upper dimension");
DATA(insert OID = 2176 ( array_length PGNSP PGUID 12 1 0 0 0 f f f f t f i s 2 0 23 "2277 23" _null_ _null_ _null_ _null_ _null_ array_length _null_ _null_ _null_ ));
DESCR("array length");
+DATA(insert OID = 3317 ( array_elemtype PGNSP PGUID 12 1 0 0 0 f f f f t f i s 1 0 26 "2277" _null_ _null_ _null_ _null_ _null_ array_elemtype _null_ _null_ _null_ ));
+DESCR("array element type");
DATA(insert OID = 3179 ( cardinality PGNSP PGUID 12 1 0 0 0 f f f f t f i s 1 0 23 "2277" _null_ _null_ _null_ _null_ _null_ array_cardinality _null_ _null_ _null_ ));
DESCR("array cardinality");
DATA(insert OID = 378 ( array_append PGNSP PGUID 12 1 0 0 0 f f f f f f i s 2 0 2277 "2277 2283" _null_ _null_ _null_ _null_ _null_ array_append _null_ _null_ _null_ ));
diff --git a/src/include/utils/array.h b/src/include/utils/array.h
index 716e756..22c0fc9 100644
--- a/src/include/utils/array.h
+++ b/src/include/utils/array.h
@@ -328,6 +328,7 @@ extern bool Array_nulls;
/*
* prototypes for functions defined in arrayfuncs.c
*/
+extern Datum array_elemtype(PG_FUNCTION_ARGS);
extern Datum array_in(PG_FUNCTION_ARGS);
extern Datum array_out(PG_FUNCTION_ARGS);
extern Datum array_recv(PG_FUNCTION_ARGS);
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
