nodeAgg has always been willing to accept an aggregate with a finalFunc
and only one transition state, but the CREATE AGGREGATE code rejected this combination.
This commit is contained in:
Tom Lane
parent
4579e68db2
commit
0a27641c1a
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/catalog/pg_aggregate.c,v 1.29 2000/01/26 05:56:10 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/catalog/pg_aggregate.c,v 1.30 2000/03/26 19:43:58 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -30,7 +30,7 @@
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* aggregates overloading has been added. Instead of the full
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* overload support we have for functions, aggregate overloading only
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* applies to exact basetype matches. That is, we don't check the
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* the inheritance hierarchy
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* inheritance hierarchy
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*
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* OLD COMMENTS:
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* Currently, redefining aggregates using the same name is not
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@ -85,6 +85,10 @@ AggregateCreate(char *aggName,
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if (!aggtransfn1Name && !aggtransfn2Name)
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elog(ERROR, "AggregateCreate: aggregate must have at least one transition function");
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if (aggtransfn1Name && aggtransfn2Name && !aggfinalfnName)
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elog(ERROR, "AggregateCreate: Aggregate must have final function with both transition functions");
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/* handle the aggregate's base type (input data type) */
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tup = SearchSysCacheTuple(TYPENAME,
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PointerGetDatum(aggbasetypeName),
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0, 0, 0);
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@ -92,6 +96,17 @@ AggregateCreate(char *aggName,
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elog(ERROR, "AggregateCreate: Type '%s' undefined", aggbasetypeName);
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xbase = tup->t_data->t_oid;
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/* make sure there is no existing agg of same name and base type */
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tup = SearchSysCacheTuple(AGGNAME,
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PointerGetDatum(aggName),
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ObjectIdGetDatum(xbase),
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0, 0);
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if (HeapTupleIsValid(tup))
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elog(ERROR,
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"AggregateCreate: aggregate '%s' with base type '%s' already exists",
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aggName, aggbasetypeName);
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/* handle transfn1 and transtype1 */
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if (aggtransfn1Name)
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{
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tup = SearchSysCacheTuple(TYPENAME,
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@ -114,14 +129,14 @@ AggregateCreate(char *aggName,
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aggtransfn1Name, aggtransfn1typeName, aggbasetypeName);
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if (((Form_pg_proc) GETSTRUCT(tup))->prorettype != xret1)
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elog(ERROR, "AggregateCreate: return type of '%s' is not '%s'",
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aggtransfn1Name,
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aggtransfn1typeName);
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aggtransfn1Name, aggtransfn1typeName);
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xfn1 = tup->t_data->t_oid;
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if (!OidIsValid(xfn1) || !OidIsValid(xret1) ||
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!OidIsValid(xbase))
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elog(ERROR, "AggregateCreate: bogus function '%s'", aggfinalfnName);
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elog(ERROR, "AggregateCreate: bogus function '%s'", aggtransfn1Name);
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}
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/* handle transfn2 and transtype2 */
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if (aggtransfn2Name)
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{
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tup = SearchSysCacheTuple(TYPENAME,
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@ -147,47 +162,57 @@ AggregateCreate(char *aggName,
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aggtransfn2Name, aggtransfn2typeName);
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xfn2 = tup->t_data->t_oid;
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if (!OidIsValid(xfn2) || !OidIsValid(xret2))
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elog(ERROR, "AggregateCreate: bogus function '%s'", aggfinalfnName);
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elog(ERROR, "AggregateCreate: bogus function '%s'", aggtransfn2Name);
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}
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tup = SearchSysCacheTuple(AGGNAME,
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PointerGetDatum(aggName),
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ObjectIdGetDatum(xbase),
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0, 0);
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if (HeapTupleIsValid(tup))
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elog(ERROR,
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"AggregateCreate: aggregate '%s' with base type '%s' already exists",
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aggName, aggbasetypeName);
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/* more sanity checks */
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if (aggtransfn1Name && aggtransfn2Name && !aggfinalfnName)
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elog(ERROR, "AggregateCreate: Aggregate must have final function with both transition functions");
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if ((!aggtransfn1Name || !aggtransfn2Name) && aggfinalfnName)
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elog(ERROR, "AggregateCreate: Aggregate cannot have final function without both transition functions");
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/* handle finalfn */
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if (aggfinalfnName)
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{
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fnArgs[0] = xret1;
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fnArgs[1] = xret2;
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int nargs = 0;
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if (OidIsValid(xret1))
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fnArgs[nargs++] = xret1;
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if (OidIsValid(xret2))
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fnArgs[nargs++] = xret2;
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fnArgs[nargs] = 0; /* make sure slot 2 is empty if just 1 arg */
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tup = SearchSysCacheTuple(PROCNAME,
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PointerGetDatum(aggfinalfnName),
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Int32GetDatum(2),
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Int32GetDatum(nargs),
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PointerGetDatum(fnArgs),
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0);
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if (!HeapTupleIsValid(tup))
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elog(ERROR, "AggregateCreate: '%s'('%s','%s') does not exist",
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aggfinalfnName, aggtransfn1typeName, aggtransfn2typeName);
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{
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if (nargs == 2)
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elog(ERROR, "AggregateCreate: '%s'('%s','%s') does not exist",
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aggfinalfnName, aggtransfn1typeName, aggtransfn2typeName);
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else if (OidIsValid(xret1))
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elog(ERROR, "AggregateCreate: '%s'('%s') does not exist",
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aggfinalfnName, aggtransfn1typeName);
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else
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elog(ERROR, "AggregateCreate: '%s'('%s') does not exist",
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aggfinalfnName, aggtransfn2typeName);
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}
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ffn = tup->t_data->t_oid;
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proc = (Form_pg_proc) GETSTRUCT(tup);
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fret = proc->prorettype;
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if (!OidIsValid(ffn) || !OidIsValid(fret))
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elog(ERROR, "AggregateCreate: bogus function '%s'", aggfinalfnName);
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}
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else
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{
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/* If no finalfn, aggregate result type is type of the sole
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* state value (we already checked there is only one)
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*/
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if (OidIsValid(xret1))
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fret = xret1;
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else
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fret = xret2;
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}
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Assert(OidIsValid(fret));
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/*
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* If transition function 2 is defined, it must have an initial value,
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* whereas transition function 1 does not, which allows man and min
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* whereas transition function 1 need not, which allows max and min
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* aggregates to return NULL if they are evaluated on empty sets.
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*/
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if (OidIsValid(xfn2) && !agginitval2)
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@ -205,26 +230,10 @@ AggregateCreate(char *aggName,
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values[Anum_pg_aggregate_aggtransfn1 - 1] = ObjectIdGetDatum(xfn1);
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values[Anum_pg_aggregate_aggtransfn2 - 1] = ObjectIdGetDatum(xfn2);
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values[Anum_pg_aggregate_aggfinalfn - 1] = ObjectIdGetDatum(ffn);
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values[Anum_pg_aggregate_aggbasetype - 1] = ObjectIdGetDatum(xbase);
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if (!OidIsValid(xfn1))
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{
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values[Anum_pg_aggregate_aggtranstype1 - 1] = ObjectIdGetDatum(InvalidOid);
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values[Anum_pg_aggregate_aggtranstype2 - 1] = ObjectIdGetDatum(xret2);
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values[Anum_pg_aggregate_aggfinaltype - 1] = ObjectIdGetDatum(xret2);
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}
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else if (!OidIsValid(xfn2))
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{
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values[Anum_pg_aggregate_aggtranstype1 - 1] = ObjectIdGetDatum(xret1);
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values[Anum_pg_aggregate_aggtranstype2 - 1] = ObjectIdGetDatum(InvalidOid);
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values[Anum_pg_aggregate_aggfinaltype - 1] = ObjectIdGetDatum(xret1);
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}
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else
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{
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values[Anum_pg_aggregate_aggtranstype1 - 1] = ObjectIdGetDatum(xret1);
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values[Anum_pg_aggregate_aggtranstype2 - 1] = ObjectIdGetDatum(xret2);
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values[Anum_pg_aggregate_aggfinaltype - 1] = ObjectIdGetDatum(fret);
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}
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values[Anum_pg_aggregate_aggtranstype1 - 1] = ObjectIdGetDatum(xret1);
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values[Anum_pg_aggregate_aggtranstype2 - 1] = ObjectIdGetDatum(xret2);
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values[Anum_pg_aggregate_aggfinaltype - 1] = ObjectIdGetDatum(fret);
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if (agginitval1)
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values[Anum_pg_aggregate_agginitval1 - 1] = PointerGetDatum(textin(agginitval1));
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