aggstate_set_extra ElemType period_agg SKIPLIST_GROW skiplist_headval SKIPLIST_INITIAL_CAPACITY SKIPLIST_INITIAL_FREELIST skiplist_make SKIPLIST_MAXLEVEL skiplist_splice skiplist_values tagg_deserialize tagg_serialize timestamp_agg tinstant_tagg tsequence_tagg

period_agg() Period** period_agg ( Period **  periods1, int  count1, Period **  periods2, int  count2, int *  newcount  ) Generic aggregate function for periods. Parameters [in] periods1 Accumulated state [in] count1 Number of elements in the accumulated state [in] periods2 Periods of a period set value [in] count2 Number of elements in the period set value [in] newcount Number of elements in the result Note Returns new periods that must be freed by the calling function.