datum_sum_int32 ensure_same_timetype_skiplist period_tagg period_tagg_transfn periodset_tagg_transfn time_tagg_combinefn timestamp_tagg tstzset_tagg_transfn

period_tagg() Span ** period_tagg ( Span **  periods1, int  count1, Span **  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 [out] newcount Number of elements in the result Note Return new periods that must be freed by the calling function.