RE: Smells like oracle bug?

  • From: "Laimutis Nedzinskas" <Laimutis.Nedzinskas@xxxxxxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Thu, 13 Jul 2006 16:12:33 -0000

I had the same thing with null values and function-based indexes. Oracle does 
not like it.


From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Jared Still
Sent: 13. júlí 2006 16:04
To: gints.plivna@xxxxxxxxx
Cc: oracle-l
Subject: Re: Smells like oracle bug?

It appears that Oracle is taking your hint quite seriously.

As there is no data in idx2 due to the only value in the
id2 column being null, Oracle is not returning any rows.

Take idx2 out of the hint, and you get data. 

Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist

On 7/13/06, Gints Plivna <gints.plivna@xxxxxxxxx> wrote: 

        SQL> create index idx2 on blahh (id2);
        Index created.
        SQL> insert into blahh values (1, null);
        1 row created.
        SQL> select 'x' from dual where exists (
          2    select /*+ index_ffs (blahh idx1 idx2) */ 'z' from blahh where 
          3    (id1 = 1 and id2 is null) or (id1 is null and id2 = 1))
          4  /
        no rows selected


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