SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function categoricalInformationValue (children 1)
     ExpressionList (children 2)
      Identifier c1
      Identifier c2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function VALUES (children 1)
       ExpressionList (children 1)
        Function tuple (children 1)
         ExpressionList (children 2)
          Function toNullable (children 1)
           ExpressionList (children 1)
            Literal UInt64_0
          Literal UInt64_0
