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16 check-ins tagged with "skip-ahead-distinct"
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2017-04-14
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| 22:41 | Fix to the decision logic for when to use the skip-ahead-distinct optimization. (Closed-Leaf check-in: e50fd489 user: drh tags: skip-ahead-distinct) | |
| 00:45 | Fix a couple of unreachable branches. (check-in: 1aa0ea8d user: drh tags: skip-ahead-distinct) | |
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2017-04-13
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| 21:29 | Fix the skip-ahead-distinct optimization so that it works with indexes that have repeated columns with different collating sequences. (check-in: ce1e2b88 user: drh tags: skip-ahead-distinct) | |
| 19:48 | Simplification of the skip-ahead-distinct logic. There is still an issue with handling COLLATE. (check-in: 57c5173b user: drh tags: skip-ahead-distinct) | |
| 18:33 | New test cases and minor fixes for the optimization on this branch. (check-in: 70ac9ea1 user: dan tags: skip-ahead-distinct) | |
| 13:01 | Only use the skip-ahead-distinct optimization if the index has been analyzed and we know that a skip-head is likely to skip over at least 11 rows. The magic number 11 was determined by experimentation. (check-in: 0cf16dec user: drh tags: skip-ahead-distinct) | |
| 01:19 | Forward port the skip-ahead-distinct branch which was abandoned for some reason that I do not recall. This port should have been achived by a merge of trunk into the previous head of skip-ahead-distinct, but that did not work. So I had to manually "rebase" the changes. (check-in: 132339a1 user: drh tags: skip-ahead-distinct) | |
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2016-04-21
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| 15:44 | Merge the latest changes from trunk. (Closed-Leaf check-in: 8183fa68 user: drh tags: skip-ahead-distinct) | |
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2016-04-15
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| 22:03 | Add the SQLITE_SkipAhead optimization setting (check-in: 87703b76 user: drh tags: skip-ahead-distinct) | |
| 16:27 | Skip-ahead is now just an optimization. If it gets confused, it falls back to an incremental scan with redundancy elimination. (check-in: 6fac0b92 user: drh tags: skip-ahead-distinct) | |
| 16:17 | Skip-ahead does not always work. So we still have to check for redundancy. (check-in: db5a2364 user: drh tags: skip-ahead-distinct) | |
| 15:54 | Fixes to the skip-ahead distinct logic. More issues remain. (check-in: 45a70b2b user: drh tags: skip-ahead-distinct) | |
| 15:06 | Merge enhancements from trunk, especially the ".eqp full" enhancement to the command-line shell. (check-in: 491f0dbd user: drh tags: skip-ahead-distinct) | |
| 14:13 | Several new test cases that cause failures. (check-in: 0379f2cf user: drh tags: skip-ahead-distinct) | |
| 13:24 | Fixed crash bugs. Still sometimes gets the wrong answers. (check-in: 2afcb2c7 user: drh tags: skip-ahead-distinct) | |
| 01:55 | Progress toward getting DISTINCT to use a seek to advance to the next distinct row, when driven by an appropriate index. (check-in: 9e14aa14 user: drh tags: skip-ahead-distinct) | |