Function datum_float8_cast

methods/array_ops/src/pg_gp/array_ops.c:1194–1221

----------------------------------------------------------------------- * Type cast functions * ----------------------------------------------------------------------- */

 * -----------------------------------------------------------------------
*/
static
inline
float8
datum_float8_cast(Datum elt, Oid element_type) {
    switch(element_type){
        case INT2OID:
            return (float8) DatumGetInt16(elt); break;
        case INT4OID:
            return (float8) DatumGetInt32(elt); break;
        case INT8OID:
            return (float8) DatumGetInt64(elt); break;
        case FLOAT4OID:
            return (float8) DatumGetFloat4(elt); break;
        case FLOAT8OID:
            return (float8) DatumGetFloat8(elt); break;
        case NUMERICOID:
            return DatumGetFloat8(
                    DirectFunctionCall1(numeric_float8_no_overflow, elt));
            break;
        default:
            ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                            errmsg("type is not supported"),
                            errdetail("Arrays with element type %s are not supported.",
                                      format_type_be(element_type))));
            break;
    }
    return 0.0;
}

static
inline