pgis_geometry_union_parallel_transfn()

Datum pgis_geometry_union_parallel_transfn

(

PG_FUNCTION_ARGS

)

Definition at line 39 of file lwgeom_union.c.

{
        MemoryContext aggcontext, old;
        UnionState *state;
        Datum argType;
        GSERIALIZED *gser = NULL;
 
        /* Check argument type */
        argType = get_fn_expr_argtype(fcinfo->flinfo, 1);
        if (argType == InvalidOid)
                ereport(ERROR, (
                                        errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                                        errmsg("%s: could not determine input data type", __func__)));
 
        /* Get memory context */
        GetAggContext(&aggcontext);
 
        /* Get state */
        if (PG_ARGISNULL(0)) {
                old = MemoryContextSwitchTo(aggcontext);
                state = state_create();
                MemoryContextSwitchTo(old);
        }
        else
        {
                state = (UnionState*) PG_GETARG_POINTER(0);
        }
 
        /* Get value */
        if (!PG_ARGISNULL(1))
                gser = PG_GETARG_GSERIALIZED_P(1);
 
        /* Get grid size */
        if (PG_NARGS() > 2 && !PG_ARGISNULL(2))
        {
                double gridSize = PG_GETARG_FLOAT8(2);
                if (gridSize > 0)
                        state->gridSize = gridSize;
        }
 
        /* Copy serialized geometry into state */
        if (gser) {
                old = MemoryContextSwitchTo(aggcontext);
                state_append(state, gser);
                MemoryContextSwitchTo(old);
        }
 
        PG_RETURN_POINTER(state);
}

References GetAggContext, UnionState::gridSize, state_append(), and state_create().

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