Karan Sikka writes:
>> Having said that, I've had a bee in my bonnet for a long time about
>> removing per-row setup cost for repetitive regex matches, and
>> whatever infrastructure that needs would work for this too.
> What are the per-row setup costs for regex matches?
Well, they're pretty da
> Having said that, I've had a bee in my bonnet for a long time about
> removing per-row setup cost for repetitive regex matches, and
> whatever infrastructure that needs would work for this too.
What are the per-row setup costs for regex matches? I looked at
`regexp.c` and saw:
```
/*
* We cach
Karan Sikka writes:
> Just for the record, I'm leaning to the side of "not worth it". My
> thoughts are, if you are at a scale where you care about this 20%
> speedup, you would want to go all the way to an indexed structure,
> because the gains you would realize would exceed 20%, and 20% may not
On Tue, Aug 2, 2016 at 1:56 PM, Alvaro Herrera wrote:
>> > How desirable is this feature? To begin answering that question,
>> > I did some initial benchmarking with an English text corpus to find how
>> > much
>> > faster BMH (Boyer-Moore-Horspool) would be compared to LIKE, and the
>> > result
Yeah, you make a fair point.
I was hoping more people would chime in with strong opinions to make the
decision easier, but perhaps the lack of noise indicates this is a low-pri
feature.
I will ask around in my coworker circles to see what they think,
could you do the same?
Just for the record, I
Robert Haas wrote:
> On Mon, Aug 1, 2016 at 1:19 PM, Karan Sikka wrote:
> > Following the patch to implement strpos with Boyer-Moore-Horspool,
> > it was proposed we bring BMH to LIKE as well.
> >
> > Original thread:
> > https://www.postgresql.org/message-id/flat/27645.1220635769%40sss.pgh.pa.us#
On Mon, Aug 1, 2016 at 7:47 PM, Karan Sikka wrote:
> I agree, should we remove it from the TODO list?
If nobody objects, sure.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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To m
I agree, should we remove it from the TODO list?
On Mon, Aug 1, 2016 at 6:13 PM, Robert Haas wrote:
> On Mon, Aug 1, 2016 at 1:19 PM, Karan Sikka wrote:
> > Following the patch to implement strpos with Boyer-Moore-Horspool,
> > it was proposed we bring BMH to LIKE as well.
> >
> > Original thre
On Mon, Aug 1, 2016 at 1:19 PM, Karan Sikka wrote:
> Following the patch to implement strpos with Boyer-Moore-Horspool,
> it was proposed we bring BMH to LIKE as well.
>
> Original thread:
> https://www.postgresql.org/message-id/flat/27645.1220635769%40sss.pgh.pa.us#27645.1220635...@sss.pgh.pa.us
Hi pgsql-hackers,
Following the patch to implement strpos with Boyer-Moore-Horspool,
it was proposed we bring BMH to LIKE as well.
Original thread:
https://www.postgresql.org/message-id/flat/27645.1220635769%40sss.pgh.pa.us#27645.1220635...@sss.pgh.pa.us
I'm a first time hacker and I found this
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