SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function mongodb (children 1)
       ExpressionList (children 6)
        Literal \'mongodb://some-cluster:27017/?retryWrites=false\'
        Literal \'test\'
        Literal \'my_collection\'
        Literal \'test_user\'
        Literal \'password\'
        Function plus (children 1)
         ExpressionList (children 2)
          Function materialize (children 1)
           ExpressionList (children 1)
            Literal UInt64_1
          Literal UInt64_1
