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| 08:41.33 | jtv | jamesh, do you happen to know if there's a known issue with negative array slicing? I'd expect result[-1:] to give me the last row in my result, but it gives me the full result. But list(result)[-1:] does work as expected. |
| 08:41.59 | jamesh | jtv: use last() |
| 08:42.31 | jamesh | negative slicing is a performance problem, and I wouldn't be surprised if we don't quite handle it right. |
| 08:42.53 | jtv | Oh crap. |
| 08:43.13 | jamesh | last() should be pretty fast: it reverses the order by clause and grabs the first result |
| 08:43.28 | jtv | And it takes a parameter saying how many of the last rows I want? |
| 08:43.50 | jamesh | that trick doesn't work for iterating over more results since you'd get them in reverse order |
| 08:44.44 | jamesh | well, if you want to do it efficiently, use the opposite ordering, grab the first N results and reverse it locally |
| 08:44.45 | jtv | I don't care which order I get my slice ordered in, as long as I can get the right slice. |
| 08:45.09 | jtv | I thought I had a good way of doing that without breaking open my abstraction layers in awkward ways. :-( |
| 08:45.18 | jamesh | if you get nonsense values from negative slices, that should be treated as a bug |
| 08:47.26 | jamesh | although the fix might end up being to raise FeatureError rather than return invalid results |
| 08:49.03 | jamesh | which might not be what you're after. |
| 08:49.24 | jtv | jamesh: that's still an improvement over me spinning my wheels trying to find the bug in my code. :) Filing bug. |
| 08:50.22 | jtv | Oh, this may be an instance of bug 239767 |
| 08:50.23 | mup | Bug #239767: Negative Indexing on results fails <Storm:New> <https://launchpad.net/bugs/239767> |
| 08:52.46 | jamesh | yes, that does look like the one. |
| 08:55.53 | jtv | I just filed bug 421829 to be sure. |
| 08:55.54 | mup | Bug #421829: Negative slicing gives unexpected result <Storm:New> <https://launchpad.net/bugs/421829> |
| 08:59.51 | jtv | jamesh: I got a bit confused by the two, so now there's a pointless self-referencing comment for the one I filed. |
| 09:22.55 | jamesh | jtv: I've marked your bug as a dupe and added info to the original bug. |
| 09:23.07 | jtv | jamesh: sorry for the hassle. |
| 09:23.13 | jamesh | no problem |
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