Greetings,
I've run into an annoying issue which I would think could be handled
better. Basically, indexes using text_pattern_ops don't work with
some complex regexps even when they (imv anyway) could. I'm willing
to believe I'm wrong about the potential to use them, or that my
regexp
Stephen Frost sfr...@snowman.net writes:
I don't see why the last case can't use the index.
The planner's understanding of regexps is far weaker than yours.
(In particular, I think it's set up to abandon optimization if it
sees | anywhere.)
regards, tom lane
--
Sent
* Tom Lane (t...@sss.pgh.pa.us) wrote:
Stephen Frost sfr...@snowman.net writes:
I don't see why the last case can't use the index.
The planner's understanding of regexps is far weaker than yours.
(In particular, I think it's set up to abandon optimization if it
sees | anywhere.)
Stephen Frost sfr...@snowman.net writes:
* Tom Lane (t...@sss.pgh.pa.us) wrote:
(In particular, I think it's set up to abandon optimization if it
sees | anywhere.)
That's kind of what I figured from the empirical data. My hope was that
it might be something which could be fixed.
See
Tom Lane wrote:
Stephen Frost sfr...@snowman.net writes:
Perhaps this is misguided but I would think that the regexp
libraries might have some support for give me all anchored required
text for this regexp which we could then use in the planner.
I wouldn't see why. It's certainly worth
Alvaro Herrera alvhe...@commandprompt.com writes:
I think changeable regex flavors turned out to be a bad idea. They can
wreak all sorts of havoc. You change the setting, SIGHUP, and suddenly
your application fails to work as expected. Maybe we should make that
setting PGC_POSTMASTER (or
On Wed, May 06, 2009 at 12:10:49PM -0400, Alvaro Herrera wrote:
Tom Lane wrote:
Stephen Frost sfr...@snowman.net writes:
Perhaps this is misguided but I would think that the regexp
libraries might have some support for give me all anchored
required text for this regexp which we could
Tom Lane wrote:
Alvaro Herrera alvhe...@commandprompt.com writes:
I think changeable regex flavors turned out to be a bad idea. They can
wreak all sorts of havoc. You change the setting, SIGHUP, and suddenly
your application fails to work as expected. Maybe we should make that
setting
Alvaro Herrera alvhe...@commandprompt.com writes:
... Maybe we should make that
setting PGC_POSTMASTER (or just get rid of it?), and provide was to pass
flags to change the flavor for particular operations (this is easy for
function-based stuff but not so easy for operators).
BTW, if you are
* Tom Lane (t...@sss.pgh.pa.us) wrote:
If we think there aren't any of those anymore, let's just kill the
GUC and be done with it.
+1.
I'll try to spend some time in backend/regexp and regex_fixed_prefix
soon.
Thanks,
Stephen
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Tom Lane wrote:
Alvaro Herrera alvhe...@commandprompt.com writes:
I think changeable regex flavors turned out to be a bad idea. They can
wreak all sorts of havoc. You change the setting, SIGHUP, and suddenly
your application fails to work as expected. Maybe we should make that
setting
On Wed, 2009-05-06 at 15:55 -0400, Andrew Dunstan wrote:
I know of at least one significant client (OpenACS) that still
apparently requires extended flavor. Removing the compatibility option
would be a major pain point for some of my clients. PGC_POSTMASTER would
be fine, though.
Isn't
Joshua D. Drake wrote:
On Wed, 2009-05-06 at 15:55 -0400, Andrew Dunstan wrote:
I know of at least one significant client (OpenACS) that still
apparently requires extended flavor. Removing the compatibility option
would be a major pain point for some of my clients. PGC_POSTMASTER would
On Wed, 2009-05-06 at 16:10 -0400, Andrew Dunstan wrote:
Isn't that why we wouldn't remove it from back releases?
My clients aren't going to be very happy if they can't upgrade because
of this.
Certainly. Nobody wants to make clients unhappy but for the good of the
code man, for
Andrew Dunstan and...@dunslane.net writes:
I know of at least one significant client (OpenACS) that still
apparently requires extended flavor.
Is this demonstrable, or just speculation? The incompatibilities
between ARE mode and (legal) ERE patterns are pretty darn small.
Alvaro Herrera alvhe...@commandprompt.com writes:
... Maybe we should make that
setting PGC_POSTMASTER (or just get rid of it?),
Another thought here: if we do get persuaded that the regex_flavor GUC
has to stay, we could eliminate it as a hazard for planning by changing
its scope to
Tom Lane wrote:
Andrew Dunstan and...@dunslane.net writes:
I know of at least one significant client (OpenACS) that still
apparently requires extended flavor.
Is this demonstrable, or just speculation? The incompatibilities
between ARE mode and (legal) ERE patterns are pretty darn
Andrew Dunstan and...@dunslane.net writes:
Tom Lane wrote:
Is this demonstrable, or just speculation? The incompatibilities
between ARE mode and (legal) ERE patterns are pretty darn small.
It's explicitly documented. Whether or not there is a good basis for the
documentation I can't yet
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