PGISDirectFunctionCall2()

Datum PGISDirectFunctionCall2	(	PGFunction	func,
		Datum	arg1,
		Datum	arg2
	)

A modified version of PostgreSQL's DirectFunctionCall2 which allows NULL results; this is required for aggregates that return NULL.

Definition at line 373 of file lwgeom_accum.c.

{
#if POSTGIS_PGSQL_VERSION < 120
        FunctionCallInfoData fcinfo;
        Datum           result;
 
        InitFunctionCallInfoData(fcinfo, NULL, 2, InvalidOid, NULL, NULL);
 
        fcinfo.arg[0] = arg1;
        fcinfo.arg[1] = arg2;
        fcinfo.argnull[0] = false;
        fcinfo.argnull[1] = false;
 
        result = (*func) (&fcinfo);
 
        /* Check for null result, returning a "NULL" Datum if indicated */
        if (fcinfo.isnull)
                return (Datum) 0;
 
        return result;
#else
        LOCAL_FCINFO(fcinfo, 2);
        Datum result;
 
        InitFunctionCallInfoData(*fcinfo, NULL, 2, InvalidOid, NULL, NULL);
 
        fcinfo->args[0].value = arg1;
        fcinfo->args[1].value = arg2;
        fcinfo->args[0].isnull = false;
        fcinfo->args[1].isnull = false;
 
        result = (*func)(fcinfo);
 
        /* Check for null result, returning a "NULL" Datum if indicated */
        if (fcinfo->isnull)
                return (Datum)0;
 
        return result;
#endif /* POSTGIS_PGSQL_VERSION < 120 */
}

Referenced by pgis_geometry_clusterwithin_finalfn().

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