[
https://issues.apache.org/jira/browse/TRAFODION-2248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15528429#comment-15528429
]
Hans Zeller commented on TRAFODION-2248:
----------------------------------------
The fixes for the two issues are:
* In the parser, when we create a CTE definition, add a RelRoot node only if
there isn't one already. I think that two RelRoot nodes stacked on top of each
other are probably not well supported, and subquery transformation is one
example for that.
* In method Parser::reset(), clear the hash table of WITH clauses.
> WITH clause with CTE used in subquery gives error
> -------------------------------------------------
>
> Key: TRAFODION-2248
> URL: https://issues.apache.org/jira/browse/TRAFODION-2248
> Project: Apache Trafodion
> Issue Type: Bug
> Components: sql-cmp
> Affects Versions: 2.0-incubating
> Reporter: Hans Zeller
> Assignee: Hans Zeller
>
> Here is a simple example for a failing query:
> {noformat}
> with cse1 as (select * from (values (1)) T(a))
> select count(*)
> from cse1
> where a > (select avg(a) from cse1);
> *** ERROR[3288] A syntax error occurred. WITH clause redefined. WITH name
> CSE1 .
> *** ERROR[8822] The statement was not prepared.
> {noformat}
> There are really two things going on here:
> * We hit an assert in RelRoot::transformNode() that assumes there are no
> subqueries above the RelRoot.
> * The error we see is different, however. That's because the initial assert
> triggers AQR (auto-query retry). When we compile the query a second time, it
> still has the CTE from the first time, and that causes the error 3288. So, we
> also need to initialize the parser list of CTEs before a recompilation.
> This is the original assert we hit:
> {noformat}
> // We are currently assuming that no subqueries have been introduced above
> me;
> // any new subquery parent would just silently be ignored!
> CMPASSERT( this == locationOfPointerToMe ); // Genesis 10-970828-6025
> {noformat}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
