Github user jianqiao commented on a diff in the pull request:
    --- Diff: query_optimizer/rules/ExtractCommonSubexpression.hpp ---
    @@ -111,7 +111,7 @@ class ExtractCommonSubexpression : public 
Rule<physical::Physical> {
       bool visitAndCount(
           const expressions::ExpressionPtr &expression,
           ScalarCounter *counter,
    -      ScalarHashable *hashable);
    +      ScalarHashable *hashable) const;
    --- End diff --
    These three methods involve the invoking of 
`optimizer_context_->nextExprId()` which modifies  the context (symbol id 
counter) of `optimizer_context_`.

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