Set_extent_transfn Set_union_finalfn Set_union_transfn Span_extent_combinefn Span_extent_transfn Span_union_finalfn Spanbase_extent_transfn Spanset_extent_transfn Spanset_union_transfn Value_union_transfn

Value_union_transfn() Datum Value_union_transfn ( PG_FUNCTION_ARGS  ) Transition function for union aggregation of sets. Note We simply gather the input values into an array so that the final function can sort and combine them @sqlfn union()