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From Mamta Satoor <msat...@gmail.com>
Subject Re: [PATCH] (DERBY-7) Bug in NULLIF Function
Date Mon, 01 Aug 2005 19:57:44 GMT
Hi,
 Just got back from 3-weeks vacation and I see that patch for Derby-7 NULLIF 
function is still waiting to be committed/reviewed for a long time now. I 
was wondering if someone can take a look and see if it is all ready to be 
committed.
 thanks,
Mamta
 On 6/12/05, Mamta Satoor <msatoor@gmail.com> wrote: 
> 
> Hi,
>  I have attached a patch in JIRA to Derby-7 to fix the NULLIF problem. The 
> test suites have run fine with the exception of miserrors. Since the time I 
> posted the patch, I saw subsequent emails about miscerror failure possibly 
> related to checkin from David Van Couvering. David I think has already 
> posted a patch on the list to fix the failure. 
>  I have copied the description of the fix from the JIRA here for 
> reference. 
>  "Following is a brief description of what the proposed fix involves. 
> For NULLIF(L,R), parser will generate CASE L=R then untyped NULL else L. 
> Notice that the NULL does not have any type associated with it during 
> parsing. This change went into sqlgrammar.jj 
> The existing code in ConditionalNode.bindExpression first binds the 
> condition L=R. At the end of L=R condition binding, we will have determined 
> the type of operand L. I have added cod into ConditionalNode to CAST untyped 
> NULL to the type of L. The exisiting code for L=R binding enforces the 
> Reference Guide Table 1. Comparisons allowed by Derby on page 111 and 112. 
> So answers for what datatypes can be combined in NULLIF can be explained 
> by that table. 
> I have added some tests to see what the return type of NULLIF would be for 
> various combinations of :L and R datatypes. I have also added test cases 
> where the first operand to NULLIF is a parameter. 
> 
> All the tests pass except one failure below which I don't think is related 
> to my changes 
> *** Start: miscerrors jdk1.4.2_07 derbyall:derbylang 2005-06-10 01:43:31 
> *** 
> 35 del 
> < xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |92 |0 | wombat | null 
> |Cleanup action starting 
> 36 del 
> < xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |92 |0 | wombat | null |Failed 
> Statement is: -- 
> 37 del 
> < xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |97 |0 | wombat | null 
> |Cleanup action starting 
> 38 del 
> < xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |97 |0 | wombat | null |Failed 
> Statement is: create table a (one int, two int) 
> 39 del 
> < xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |100 |0 | wombat | null 
> |Cleanup action starting 
> 40 del 
> < xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |100 |0 | wombat | null 
> |Failed Statement is: create table a (one int) 
> 40a35,40 
> > xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |91 |0 | wombat | null 
> |Cleanup action starting 
> > xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |91 |0 | wombat | null |Failed 
> Statement is: -- 
> > xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |96 |0 | wombat | null 
> |Cleanup action starting 
> > xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |96 |0 | wombat | null |Failed 
> Statement is: create table a (one int, two int) 
> > xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |99 |0 | wombat | null 
> |Cleanup action starting 
> > xxxxxxFILTERED-TIMESTAMPxxxxx|main,5,main |99 |0 | wombat | null |Failed 
> Statement is: create table a (one int) 
> Test Failed. 
> *** End: miscerrors jdk1.4.2_07 derbyall:derbylang 2005-06-10 01:43:48 *** 
> 
> 
> 
> Output of svn stat 
> M java\engine\org\apache\derby\impl\sql\compile\ConditionalNode.java 
> M java\engine\org\apache\derby\impl\sql\compile\sqlgrammar.jj 
> M 
> java\testing\org\apache\derbyTesting\functionTests\tests\lang\coalesceTests.java 
> 
> M 
> java\testing\org\apache\derbyTesting\functionTests\tests\jdbcapi\resultset.java 
> 
> M 
> java\testing\org\apache\derbyTesting\functionTests\master\DerbyNet\resultset.out 
> 
> M 
> java\testing\org\apache\derbyTesting\functionTests\master\DerbyNetClient\resultset.out

> 
> M java\testing\org\apache\derbyTesting\functionTests\master\resultset.out 
>  If everything looks good and no one has comments, can a commiter please 
> commit this patch?
> Mamta
>

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