Re: Reverse btree indexes

On Tue, Jun 22, 2021 at 2:28 PM Zach Aysan <zachaysan(at)gmail(dot)com> wrote:

> *Desired improvement:*
>
> for example, col LIKE 'foo%' or col ~ '^foo', but not col LIKE '%bar',
>> which would require a reversed index on the field. Postgres will
>> automatically use the reverse index for LIKE '%bar'
>
>
> *Or if it doesn't:*
>

It doesn't, otherwise the documentation wouldn't need to point out: but not
col LIKE '%bar' ...

>
>> for example, col LIKE 'foo%' or col ~ '^foo', but not col LIKE '%bar',
>> which would require a reversed index on the field. To use the reversed
>> index, query with reverse(col) like reverse('%bar').
>
>
>
This type of commentary isn't usually something we include in the
documentation...and I'm not too keen on "reversed index" as a phrase
regardless.

David J.