[jira] Closed: (DERBY-5) Network Server Protocol error when select fails and "order by" is specified

["Kathey Marsden (JIRA)" <de...@db.apache.org>]

     [ http://issues.apache.org/jira/browse/DERBY-5?page=all ]
     
Kathey Marsden closed DERBY-5:
------------------------------

    Assign To: A B

> Network Server Protocol error when select fails and "order by" is specified
> ---------------------------------------------------------------------------
>
>          Key: DERBY-5
>          URL: http://issues.apache.org/jira/browse/DERBY-5
>      Project: Derby
>         Type: Bug
>   Components: Network Server
>     Versions: 10.0.2.0
>     Reporter: Tulika Agrawal
>     Assignee: A B
>      Fix For: 10.2.0.0, 10.1.1.0

>
> Reporting for Army, filed on derby-dev list.
> If, when using the Network Server, one tries to execute a select 
> statement that fails because of an SQL exception (ex. divide-by-zero), 
> and if an "order by" clause is specified as part of the select, the 
> server will throw a distributed protocol exception, instead of the 
> appropriate error.
> Repro (using the "ij" utility)
> ij> connect 'jdbc:derby:net://localhost:1527/myDB:user=u;password=p;';
> ij> create table t1 (i int, j int);
> 0 rows inserted/updated/deleted
> ij> insert into t1 values (2,0);
> 1 row inserted/updated/deleted
> -- Without an "order by" it's fine...
> -- (22012 ==> "Attempt to divide by zero.", which is fine)
> ij> select {fn mod(i,j)} from t1;
> 1
> -----------
> ERROR 22012: DB2 SQL error: SQLCODE: -1, SQLSTATE: 22012, SQLERRMC: 22012
> -- With an order by, it dies...
> ij> select {fn mod(i,j)} from t1 order by 1;
> ERROR 58009: Execution failed due to a distribution protocol error that 
> caused deallocation of the conversation. A DRDA Data Stream Syntax Error 
> was detected. Reason: 0x13
> NOTES:
> The problem is in the DRDAConnThread.java file, "processCommands(...)" 
> method, in the "case CodePoint.OPNQRY" block of code. In the case of an 
> SQL exception, there's a call to "writer.clearBuffer()" that is used to 
> ensure that _only_ an OPNQFLRM is sent back to the client, not the 
> OPNQRYRM and/or QRYDSC that may have been written to buffer before the 
> OPNQFLRM. That call to "clearBuffer" has to be replaced with something 
> smarter, so that instead of doing a full clear (which causes the problem 
> shown above), it only backs out the buffer writes that it has made since 
> beginning the "case CodePoint.OPNQRY" block...

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