period_to_periodset period_to_periodset_internal periodset_bbox periodset_bbox_ptr periodset_cmp periodset_cmp_internal periodset_constructor periodset_copy periodset_duration periodset_end_period periodset_end_timestamp periodset_end_timestamp_internal periodset_eq periodset_eq_internal periodset_find_timestamp periodset_ge periodset_gt periodset_in periodset_le periodset_lt periodset_make periodset_make_free periodset_mem_size periodset_ne periodset_ne_internal periodset_num_periods periodset_num_timestamps periodset_out periodset_per_n periodset_period_n periodset_periods periodset_periods_internal periodset_recv periodset_send periodset_shift periodset_shift_internal periodset_start_period periodset_start_timestamp periodset_start_timestamp_internal periodset_timespan periodset_timestamp_n periodset_timestamps periodset_to_period periodset_to_period_internal periodset_to_string timestamp_to_periodset timestamp_to_periodset_internal timestampset_to_periodset timestampset_to_periodset_internal

periodset_start_period() Datum periodset_start_period ( PG_FUNCTION_ARGS  ) Returns the start period of the period set value.