datum_max_float8 datum_max_int32 datum_max_text datum_min_float8 datum_min_int32 datum_min_text datum_sum_double2 datum_sum_double3 datum_sum_double4 datum_sum_float8 tcontseq_tagg_transfn tdiscseq_tagg_transfn temporal_tagg_combinefn temporal_tagg_combinefn1 temporal_tagg_finalfn temporal_tagg_transfn temporal_tagg_transform_transfn temporal_transform_tagg temporal_transform_tcount tinstant_tagg tinstant_tagg_transfn tinstant_tavg_finalfn tnumberinst_transform_tavg tsequence_tagg tsequence_tavg_finalfn tsequenceset_tagg_transfn

datum_sum_double2() Datum datum_sum_double2 ( Datum  l, Datum  r  ) Return the sum of the two arguments.