SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Literal \'x\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function numbers (children 1)
       ExpressionList (children 1)
        Literal UInt64_2
   ExpressionList (children 1)
    Identifier number
   Function less (children 1)
    ExpressionList (children 2)
     Function count (children 1)
      ExpressionList (children 1)
       Identifier number
     Literal UInt64_0
