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Add string_agg aggregate functions. The one argument version concatenates

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the input values into a string. The two argument version also does the same
thing, but inserts delimiters between elements.

Original patch by Pavel Stehule, reviewed by David E. Wheeler and me.
This commit is contained in:
Itagaki Takahiro
2010-02-01 03:14:45 +00:00
parent ee3a81f0a0
commit 9ea9918e37
8 changed files with 193 additions and 7 deletions
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9
src/include/utils/builtins.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.345 2010/01/25 20:55:32 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.346 2010/02/01 03:14:45 itagaki Exp $
*
*-------------------------------------------------------------------------
*/
@ -724,6 +724,10 @@ extern Datum unknownsend(PG_FUNCTION_ARGS);
extern Datum pg_column_size(PG_FUNCTION_ARGS);
extern Datum string_agg_transfn(PG_FUNCTION_ARGS);
extern Datum string_agg_delim_transfn(PG_FUNCTION_ARGS);
extern Datum string_agg_finalfn(PG_FUNCTION_ARGS);
/* version.c */
extern Datum pgsql_version(PG_FUNCTION_ARGS);
@ -772,6 +776,9 @@ extern Datum translate(PG_FUNCTION_ARGS);
extern Datum chr (PG_FUNCTION_ARGS);
extern Datum repeat(PG_FUNCTION_ARGS);
extern Datum ascii(PG_FUNCTION_ARGS);
extern Datum string_agg_transfn(PG_FUNCTION_ARGS);
extern Datum string_agg_delim_transfn(PG_FUNCTION_ARGS);
extern Datum string_agg_finalfn(PG_FUNCTION_ARGS);
/* inet_net_ntop.c */
extern char *inet_net_ntop(int af, const void *src, int bits,