SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function corr (children 1)
     ExpressionList (children 2)
      Identifier c1
      Identifier c2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function VALUES (children 1)
       ExpressionList (children 4)
        Literal Tuple_(UInt64_0, UInt64_0)
        Literal Tuple_(NULL, UInt64_2)
        Literal Tuple_(UInt64_1, UInt64_0)
        Literal Tuple_(UInt64_1, UInt64_1)
