datum_sum_int32 ensure_same_timetype_skiplist period_agg period_agg_transfn period_extent_transfn period_tcount_transfn period_transform_tcount period_tunion_finalfn period_tunion_transfn periodset_agg_transfn periodset_extent_transfn periodset_tcount_transfn periodset_transform_tcount periodset_tunion_transfn time_agg_combinefn time_extent_combinefn time_tunion_combinefn timestamp_agg timestamp_tunion_finalfn timestampset_agg_transfn timestampset_extent_transfn timestampset_tcount_transfn timestampset_transform_tcount timestampset_tunion_transfn

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.