elem_adjacent_range elem_left_range elem_overleft_range elem_overright_range elem_right_range intrange_canonical lower_datum lower_inc range_adjacent_elem range_bounds range_left_elem range_make range_overleft_elem range_overright_elem range_right_elem range_to_string rangearr_normalize upper_datum upper_inc

range_left_elem() Datum range_left_elem ( PG_FUNCTION_ARGS  ) Returns true if the range value is strictly to the left of the value.