message: Bug fix: make sure ToString() doesn't crash for ExpressionType::AGGREGATE_COUNT_STAR.
diff: @@ -36,6 +36,10 @@ public:
  static unique_ptr<Expression> Deserialize(ExpressionType type, TypeId return_type, Deserializer &source);
  string ToString() const override {
  + if (type == ExpressionType::AGGREGATE_COUNT_STAR) {
  + return GetName() + "(*)";
  + }
  +
  return GetName() + "(" + child->ToString() + ")";
  }
  