SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function materialize (alias x) (children 1)
     ExpressionList (children 1)
      Function toDateTime (children 1)
       ExpressionList (children 2)
        Literal \'2000-01-01 00:00:00\'
        Literal \'Asia/Istanbul\'
    Function toDate (alias y) (children 1)
     ExpressionList (children 1)
      Literal \'2000-01-02\'
    Function if (alias z) (children 1)
     ExpressionList (children 3)
      Literal UInt64_1
      Identifier x
      Identifier y