datum_sum_int32 period_tunion_finalfn period_tunion_transfn periodset_tunion_transfn time_tunion_combinefn timestamp_tunion_finalfn timestampset_tunion_transfn

periodset_tunion_transfn() Datum periodset_tunion_transfn ( PG_FUNCTION_ARGS  ) Transition function for union aggregate of period sets.