well defined overflow

The grouping test seems to indicate that failed map lookups should
result in adding the undefined value. undefined + undefined =>
0. Previously with undefined overflow, now with well defined overflow.

1 files changed, 1 insertions, 1 deletions

diff --git a/searchlib/src/vespa/searchlib/expression/integerresultnode.h b/searchlib/src/vespa/searchlib/expression/integerresultnode.h
index a7fe86acd97..e63ac783bc8 100644
--- a/searchlib/src/vespa/searchlib/expression/integerresultnode.h
+++ b/searchlib/src/vespa/searchlib/expression/integerresultnode.h
@@ -28,7 +28,7 @@ public:
         T bv(static_cast<const IntegerResultNodeT &>(b)._value);
         return (_value < bv) ? -1 : (_value > bv) ? 1 : 0;
     }
-    void add(const ResultNode & b) override { _value += b.getInteger(); }
+    void add(const ResultNode & b) override { _value = uint64_t(_value) + uint64_t(b.getInteger()); }
     void negate() override { _value = - _value; }
     void multiply(const ResultNode & b) override {
         if constexpr (std::is_same_v<T, bool>) {