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_1
   Function greater (children 1)
    ExpressionList (children 2)
     Identifier last_seen
     Literal UInt64_2
