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

tinstant_tagg() TInstant** tinstant_tagg ( TInstant **  instants1, int  count1, TInstant **  instants2, int  count2, Datum(*)(Datum, Datum)  func, int *  newcount  )