SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function substringIndex (children 1)
     ExpressionList (children 3)
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal \'www.clickhouse.com\'
      Literal \'.\'
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal Int64_-4
