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16 check-ins tagged with "skip-ahead-distinct"

2017-04-14
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
2017-04-13
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
2016-04-21
15:44
Merge the latest changes from trunk. Closed-Leaf check-in: 8183fa68 user: drh tags: skip-ahead-distinct
2016-04-15
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