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From "Daniel John Debrunner (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-479) Passing the return of a RETURN NULL ON NULL INPUT function to another function call throws linkage error.
Date Thu, 25 May 2006 17:14:31 GMT
    [ http://issues.apache.org/jira/browse/DERBY-479?page=comments#action_12413279 ] 

Daniel John Debrunner commented on DERBY-479:

Back in an earlier comment I said:

Another aspect that may not be important, but before this change the conversion nodes are
always dropped if they are between Java expressions, and that was incorrect in one situation,
functions with RETURNS NULL ON NULL INPUT. Now you have changed it so they are only dropped
in one situation, both methods being CALLED ON NULL INPUT (assuming a modified patch). Thus
the optimization is being lost in situations where it is useful. Maybe this is not an issue
because those siutations typically don't arise any more, but some internal statements that
use Java expressions may be losing this optimization.

Having worked on triggers recently for DERBY-438 I see that Java expressions are heavily used
in accessing data with a trigger's action statement. Thus it would be best to reinstate the
optimization of dropping conversion nodes for pure java expressions to avoid performance degradation
in 10.2

> Passing the return of  a RETURN NULL ON NULL INPUT function to another function call
throws linkage error.
> ----------------------------------------------------------------------------------------------------------
>          Key: DERBY-479
>          URL: http://issues.apache.org/jira/browse/DERBY-479
>      Project: Derby
>         Type: Bug

>   Components: SQL
>     Versions:
>     Reporter: Daniel John Debrunner
>     Assignee: Mamta A. Satoor
>      Fix For:
>  Attachments: Derby479LinkageErrorReturnNullIfNulldiff021306.txt, Derby479LinkageErrorReturnNullIfNulldiff021406.txt,
Derby479LinkageErrorReturnNullIfNulldiff021606.txt, Derby479Version4LinkageErrorReturnNullIfNull022006.txt,
Derby479Version5LinkageErrorReturnNullIfNull022206.txt, wisconsin.out, wisconsinAfterRemovingNullChk.out
> Error in ij (RN_RADIANS is a function declared as returns null on null input)
> ERROR XBCM1: Java linkage error thrown during load of generated class org.apache.derby.exe.ace5214067x0105x5e41x7a46xffff855452e375.
> ERROR XJ001: Java exception: '(class: org/apache/derby/exe/ace5214067x0105x5e41x
> 7a46xffff855452e375, method: e0 signature: ()Ljava/lang/Object;) Expecting to find double
on stack: java.lang.VerifyError'.
> extract from derby.log
> 2005-07-28 16:23:43.836 GMT Thread[main,5,main] Wrote class org.apache.derby.exe
> .ace5214067x0105x5e41x7a46xffff855452e375 to file C:\_work\svn_pb\trunk\systest\
> out\functions\ace5214067x0105x5e41x7a46xffff855452e375.class. Please provide sup
> port with the file and the following exception information: java.lang.VerifyErro
> r: (class: org/apache/derby/exe/ace5214067x0105x5e41x7a46xffff855452e375, method
> : e0 signature: ()Ljava/lang/Object;) Expecting to find double on stack
> I will add a test case to lang/functions.sql commented with this bug number. Test cases
> that fail will be commented out.

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