Github user zuyu commented on a diff in the pull request:
    --- Diff: query_optimizer/expressions/AttributeReference.cpp ---
    @@ -57,6 +60,22 @@ ::quickstep::Scalar *AttributeReference::concretize(
       return new ::quickstep::ScalarAttribute(*found_it->second);
    +std::size_t AttributeReference::computeHash() const {
    +  return std::hash<std::size_t>()(static_cast<std::size_t>(id()));
    --- End diff --
    FYI, the hash implementation for an integer is to return itself. So, we 
could just return `id()`.

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