SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier null_in_1
   Function in (children 1)
    ExpressionList (children 2)
     Function tuple (children 1)
      ExpressionList (children 2)
       Identifier u
       Identifier n
     Literal Tuple_(Tuple_(UInt64_1, UInt64_2), Tuple_(UInt64_1, NULL), Tuple_(UInt64_2, UInt64_2))
