From: | "Reuven M(dot) Lerner" <reuven(at)lerner(dot)co(dot)il> |
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To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
Cc: | Steve Crawford <scrawford(at)pinpointresearch(dot)com>, Alex Hunsaker <badalex(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Speeding up loops in pl/pgsql function |
Date: | 2011-06-01 09:19:30 |
Message-ID: | 4DE60422.3090800@lerner.co.il |
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Lists: | pgsql-performance |
Hi, everyone.
First of all, thanks for all of your help several days ago. The
improvements to our program were rather dramatic (in a positive sense).
Based on the help that everyone gave, I'm working on something similar,
trying to use regexp_replace to transform a string into the result of
invoking a function on each character. For example, I'd like to do the
following:
regexp_replace('abc', '(.)', ascii(E'\\1')::text, 'g');
Unfortunately, the above invokes ascii() on the literal string E'\\1',
rather than on the value of the backreference, which isn't nearly as
useful. I'd like to get '979899' back as a string. And of course, once
I can get back the value of ascii(), I figure that it should work for
any function that I define.
Thanks again for any suggestions everyone might have.
(And if this should go to pgsql-general, then I'll understand. If it
helps, my alternative to regexp_replace is a super-slow function, akin
to the one that I showed here last week.)
Reuven
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