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

SKIPLIST_MAXLEVEL #define SKIPLIST_MAXLEVEL   32 maximum possible is 47 with current RNG