datum_sum_int32 ensure_same_timetype_skiplist period_tagg period_tcount_transfn period_transform_tcount period_tunion_finalfn period_tunion_transfn periodset_tcount_transfn periodset_transform_tcount periodset_tunion_transfn time_tagg_combinefn timestamp_tagg timestamp_tcount_transfn timestamp_transform_tcount timestamp_tunion_finalfn timestamp_tunion_transfn tstzset_tcount_transfn tstzset_transform_tcount tstzset_tunion_transfn

timestamp_tagg() TimestampTz * timestamp_tagg ( TimestampTz *  times1, int  count1, TimestampTz *  times2, int  count2, int *  newcount  )