SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Literal \'constants:\'
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Function array (children 1)
       ExpressionList (children 4)
        Function tuple (children 1)
         ExpressionList (children 2)
          Literal NULL
          Function array (children 1)
           ExpressionList
        Function tuple (children 1)
         ExpressionList (children 2)
          Function toNullable (children 1)
           ExpressionList (children 1)
            Function toFixedString (children 1)
             ExpressionList (children 2)
              Literal \'a\'
              Literal UInt64_4
          Function array (children 1)
           ExpressionList
        Function tuple (children 1)
         ExpressionList (children 2)
          Function toNullable (children 1)
           ExpressionList (children 1)
            Function toFixedString (children 1)
             ExpressionList (children 2)
              Literal \'a\'
              Literal UInt64_4
          Function array (children 1)
           ExpressionList (children 1)
            Function tuple (children 1)
             ExpressionList (children 2)
              Literal NULL
              Literal \'a\'
        Function tuple (children 1)
         ExpressionList (children 2)
          Function toNullable (children 1)
           ExpressionList (children 1)
            Function toFixedString (children 1)
             ExpressionList (children 2)
              Literal \'a\'
              Literal UInt64_4
          Function array (children 1)
           ExpressionList (children 2)
            Function tuple (children 1)
             ExpressionList (children 2)
              Literal NULL
              Literal \'a\'
            Function tuple (children 1)
             ExpressionList (children 2)
              Literal NULL
              Literal \'a\'
