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

Span_extent_combinefn() Datum Span_extent_combinefn ( PG_FUNCTION_ARGS  ) Combine function for extent aggregation of spans @sqlfn extent()