Re: Minmax indexes

On Mon, November 11, 2013 09:53, Erik Rijkers wrote:
> On Fri, November 8, 2013 21:11, Alvaro Herrera wrote:
>>
>> Here's a version 7 of the patch, which fixes these bugs and adds
>> opclasses for a bunch more types (timestamp, timestamptz, date, time,
>> timetz), courtesy of Martín Marqués.  It's also been rebased to apply
>> cleanly on top of today's master branch.
>>
>> I have also added a selectivity function, but I'm not positive that it's
>> very useful yet.
>>
>> [minmax-7.patch]
>
> The earlier errors are indeed fixed; now, I've been trying with the attached test case but I'm unable to find a query that
> improves with minmax index use.  (it gets used sometimes but speedup is negligable).
>

Another issue (I think):

Attached is a program (and output as a .txt file) that gives the following (repeatable) error:

$ ./casanova_test.sh
\timing on
                drop table if exists t1;
Time: 333.159 ms
                create table t1 (i int);
Time: 155.827 ms
                create index t1_i_idx on t1 using minmax(i);
Time: 204.031 ms
                insert into t1 select generate_series(1, 25000000);
Time: 126312.302 ms
        analyze t1;
ERROR:  could not truncate file base/21324/26339_vm to 41 blocks: it's only 1 blocks now
Time: 472.504 ms
[...]


Thanks,

Erik Rijkers