pgis_geometry_union_parallel_combinefn()

Datum pgis_geometry_union_parallel_combinefn

(

PG_FUNCTION_ARGS

)

Definition at line 91 of file lwgeom_union.c.

{
        MemoryContext aggcontext, old;
        UnionState *state1 = NULL;
        UnionState *state2 = NULL;
 
        if (!PG_ARGISNULL(0))
                state1 = (UnionState*) PG_GETARG_POINTER(0);
        if (!PG_ARGISNULL(1))
                state2 = (UnionState*) PG_GETARG_POINTER(1);
 
        GetAggContext(&aggcontext);
 
        if (state1 && state2)
        {
                old = MemoryContextSwitchTo(aggcontext);
                state_combine(state1, state2);
                lwfree(state2);
                MemoryContextSwitchTo(old);
        }
        else if (state2)
        {
                state1 = state2;
        }
 
        if (!state1)
                PG_RETURN_NULL();
        PG_RETURN_POINTER(state1);
}

References GetAggContext, lwfree(), and state_combine().

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