SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function mergeTreeIndex (children 1)
       ExpressionList (children 3)
        Function currentDatabase (children 1)
         ExpressionList
        Literal \'t_mt_params\'
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier non_existing_param
          Literal UInt64_1
