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From "Mamta A. Satoor (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 Wed, 15 Feb 2006 19:07:10 GMT
    [ http://issues.apache.org/jira/browse/DERBY-479?page=comments#action_12366523 ] 

Mamta A. Satoor commented on DERBY-479:
---------------------------------------

In the parsing phase, we do not yet know whether the sql function is defined as RETURN NULL
ON NULL INPUT or as CALLED ON NULL INPUT and hence the optimization for CALLED ON NULL INPUT
can't done in MethodCallNode.addParams(Vector). But during the bind phase, after all the parameters
are bound (StaticMethodCallNode.bindExpression line number 170), we get information about
the  underlying sql function from the system tables. At this point (StaticMethodCallNode.bindExpression
line number 241), we can find out whether the function is defined as CALLED ON NULL INPUT
and possibly can optimize the parameter code for CALLED ON NULL INPUT by going directly to
java value rather than going JavaToSQLValueNode and then SLQToJavaValueNode on top of it.
Let me know if anyone has any comments on this approach. If not, I will investigate in putting
the shortcut code in for CALLED ON NULL INPUT.

> 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: 10.2.0.0
>     Reporter: Daniel John Debrunner
>     Assignee: Mamta A. Satoor
>  Attachments: Derby479LinkageErrorReturnNullIfNulldiff021306.txt, Derby479LinkageErrorReturnNullIfNulldiff021406.txt
>
> Error in ij (RN_RADIANS is a function declared as returns null on null input)
> ij> VALUES CAST( CALL_COS(RN_RADIANS(90.0)) AS DECIMAL(3,2));
> 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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