message: Fix for adding children to FunctionExpression
diff: @@ -12,7 +12,7 @@ FunctionExpression::FunctionExpression(string schema, string function_name, vect
  : Expression(ExpressionType::FUNCTION), schema(schema), function_name(StringUtil::Lower(function_name)),
  bound_function(nullptr) {
  for (auto &child : children) {
  - children.push_back(move(child));
  + this->children.push_back(move(child));
  }
  }
  