database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-30 21:42:05 +03:00
Code Activity

array_agg aggregate function, as per SQL:2008, but without ORDER BY clause

Browse Source 
Rearrange the documentation a bit now that array_agg and xmlagg have similar
semantics and issues.

best of Robert Haas, Jeff Davis, Peter Eisentraut
This commit is contained in:
Peter Eisentraut
2008-11-13 15:59:51 +00:00
parent 69a0e2f76d
commit 3379fae6de
9 changed files with 164 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
src/backend/utils/adt/array_userfuncs.c
View File

@ -6,12 +6,13 @@
* Copyright (c) 2003-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/array_userfuncs.c,v 1.23 2008/01/01 19:45:52 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/array_userfuncs.c,v 1.24 2008/11/13 15:59:50 petere Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "nodes/execnodes.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
@ -465,3 +466,34 @@ create_singleton_array(FunctionCallInfo fcinfo,
return construct_md_array(dvalues, NULL, ndims, dims, lbs, element_type,
typlen, typbyval, typalign);
}
Datum
array_agg_transfn(PG_FUNCTION_ARGS)
{
Oid arg1_typeid = get_fn_expr_argtype(fcinfo->flinfo, 1);
if (arg1_typeid == InvalidOid)
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not determine input data type")));
/* cannot be called directly because of internal-type argument */
Assert(fcinfo->context && IsA(fcinfo->context, AggState));
PG_RETURN_POINTER(accumArrayResult(PG_ARGISNULL(0) ? NULL : (ArrayBuildState *) PG_GETARG_POINTER(0),
PG_ARGISNULL(1) ? (Datum) 0 : PG_GETARG_DATUM(1),
PG_ARGISNULL(1),
arg1_typeid,
((AggState *) fcinfo->context)->aggcontext));
}
Datum
array_agg_finalfn(PG_FUNCTION_ARGS)
{
/* cannot be called directly because of internal-type argument */
Assert(fcinfo->context && IsA(fcinfo->context, AggState));
if (PG_ARGISNULL(0))
PG_RETURN_NULL(); /* returns null iff no input values */
PG_RETURN_ARRAYTYPE_P(makeArrayResult((ArrayBuildState *) PG_GETARG_POINTER(0), CurrentMemoryContext));
}