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As someone asked for this feature - patch for 1.09 follows. 

Now You can do queries like

select sum(some_func(x)) from ...
select min(table1.x + table2.y) from table1, table2 where ...

and so on.

Vadim
This commit is contained in:
Bruce Momjian 1996-11-30 17:49:02 +00:00
parent 87352726b2
commit f0a9e64afd
3 changed files with 52 additions and 14 deletions
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50
src/backend/executor/nodeAgg.c
View File

@ -259,16 +259,33 @@ ExecAgg(Agg *node)
Datum newVal;
AggFuncInfo *aggfns = &aggFuncInfo[i];
Datum args[2];
newVal = aggGetAttr(outerslot,
Node *tagnode;
switch(nodeTag(aggregates[i]->target))
{
case T_Var:
tagnode = NULL;
newVal = aggGetAttr(outerslot,
aggregates[i],
&isNull);
break;
case T_Expr:
tagnode = ((Expr*)aggregates[i]->target)->oper;
econtext->ecxt_scantuple = outerslot;
newVal = ExecEvalExpr (aggregates[i]->target, econtext,
&isNull, NULL);
break;
default:
elog(WARN, "ExecAgg: Bad Agg->Target for Agg %d", i);
}
if (isNull)
continue; /* ignore this tuple for this agg */
if (aggfns->xfn1) {
if (noInitValue[i]) {
int byVal;
/*
* value1 and value2 has not been initialized. This
* is the first non-NULL value. We use it as the
@ -278,17 +295,32 @@ ExecAgg(Agg *node)
to make a copy of it since the tuple from which
it came will be freed on the next iteration
of the scan */
attnum = ((Var*)aggregates[i]->target)->varattno;
attlen = outerslot->ttc_tupleDescriptor->attrs[attnum-1]->attlen;
if ( tagnode != NULL )
{
FunctionCachePtr fcache_ptr;
if ( nodeTag(tagnode) == T_Func )
fcache_ptr = ((Func*)tagnode)->func_fcache;
else
fcache_ptr = ((Oper*)tagnode)->op_fcache;
attlen = fcache_ptr->typlen;
byVal = fcache_ptr->typbyval;
}
else
{
attnum = ((Var*)aggregates[i]->target)->varattno;
attlen = outerslot->ttc_tupleDescriptor->attrs[attnum-1]->attlen;
byVal = outerslot->ttc_tupleDescriptor->attrs[attnum-1]->attbyval;
}
if (attlen == -1) {
/* variable length */
/* variable length */
attlen = VARSIZE((struct varlena*) newVal);
}
value1[i] = (Datum)palloc(attlen);
if (outerslot->ttc_tupleDescriptor->attrs[attnum-1]->attbyval)
value1[i] = newVal;
else
memmove((char*) (value1[i]), (char*) (newVal), attlen);
if ( byVal )
value1[i] = newVal;
else
memmove((char*)(value1[i]), (char*)newVal, attlen);
/* value1[i] = newVal; */
noInitValue[i] = 0;
nulls[i] = 0;

5
src/backend/optimizer/util/clauses.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.4 1996/11/06 09:29:22 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.5 1996/11/30 17:48:52 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -521,6 +521,9 @@ fix_opid(Node *clause)
fix_opid((Node*)get_leftop((Expr*)clause));
fix_opid((Node*)get_rightop((Expr*)clause));
}
else if (agg_clause (clause)) {
fix_opid (((Aggreg*)clause)->target);
}
}

11
src/backend/parser/parser.c
View File

@ -6,7 +6,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parser.c,v 1.12 1996/11/25 03:03:48 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parser.c,v 1.13 1996/11/30 17:49:02 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -434,13 +434,16 @@ ParseAgg(char *aggname, Oid basetype, Node *target)
fintype = aggform->aggfinaltype;
xfn1 = aggform->aggtransfn1;
if (nodeTag(target) != T_Var)
elog(WARN, "parser: aggregate can only be applied on an attribute");
if (nodeTag(target) != T_Var && nodeTag(target) != T_Expr)
elog(WARN, "parser: aggregate can only be applied on an attribute or expression");
/* only aggregates with transfn1 need a base type */
if (OidIsValid(xfn1)) {
basetype = aggform->aggbasetype;
vartype = ((Var*)target)->vartype;
if (nodeTag(target) == T_Var)
vartype = ((Var*)target)->vartype;
else
vartype = ((Expr*)target)->typeOid;
if (basetype != vartype) {
Type tp1, tp2, get_id_type();