SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 2)
           Function sum (alias dates_seen) (children 1)
            ExpressionList (children 1)
             Identifier last_seen
           Function materialize (alias last_seen) (children 1)
            ExpressionList (children 1)
             Literal UInt64_2
   Function less (children 1)
    ExpressionList (children 2)
     Identifier last_seen
     Literal UInt64_2
