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CREATE TYPE stringlist IS TABLE OF VARCHAR2(4000);
CREATE OR REPLACE TYPE t_string_agg AS OBJECT ( strings stringlist, STATIC FUNCTION ODCIAggregateInitialize( sctx IN OUT t_string_agg ) RETURN NUMBER, MEMBER FUNCTION ODCIAggregateIterate( self IN OUT t_string_agg, value IN VARCHAR2 ) RETURN NUMBER, MEMBER FUNCTION ODCIAggregateTerminate( self IN t_string_agg, returnValue OUT VARCHAR2, flags IN NUMBER ) RETURN NUMBER, MEMBER FUNCTION ODCIAggregateMerge( self IN OUT t_string_agg, ctx2 IN t_string_agg ) RETURN NUMBER ); /
CREATE OR REPLACE TYPE BODY t_string_agg IS STATIC FUNCTION ODCIAggregateInitialize( sctx IN OUT t_string_agg ) RETURN NUMBER IS BEGIN sctx := t_string_agg( stringlist() ); RETURN ODCIConst.Success; END; MEMBER FUNCTION ODCIAggregateIterate( self IN OUT t_string_agg, value IN VARCHAR2 ) RETURN NUMBER IS BEGIN SELF.strings.EXTEND; SELF.strings( SELF.strings.COUNT ) := value; RETURN ODCIConst.Success; END; MEMBER FUNCTION ODCIAggregateTerminate( self IN t_string_agg, returnValue OUT VARCHAR2, flags IN NUMBER ) RETURN NUMBER IS BEGIN SELECT LISTAGG( column_value, ',' ) WITHIN GROUP ( ORDER BY column_value ) INTO returnValue FROM TABLE( SELF.strings ); RETURN ODCIConst.Success; END; MEMBER FUNCTION ODCIAggregateMerge( self IN OUT t_string_agg, ctx2 IN t_string_agg ) RETURN NUMBER IS BEGIN SELF.strings := SELF.strings MULTISET UNION ALL ctx2.strings; RETURN ODCIConst.Success; END; END; /
CREATE OR REPLACE FUNCTION wm_concat (p_input VARCHAR2) RETURN VARCHAR2 PARALLEL_ENABLE AGGREGATE USING t_string_agg; /
CREATE TABLE test_data ( id, value ) AS SELECT 1, 'C' FROM DUAL UNION ALL SELECT 1, 'A' FROM DUAL UNION ALL SELECT 1, 'B' FROM DUAL UNION ALL SELECT 2, 'D' FROM DUAL UNION ALL SELECT 2, 'E' FROM DUAL;
5 rows affected
SELECT id, wm_concat( value ) AS wm_concat, LISTAGG( value, ',' ) WITHIN GROUP ( ORDER BY value ) AS listagg FROM test_data GROUP BY id;
ID
WM_CONCAT
LISTAGG
1
A,B,C
A,B,C
2
D,E
D,E