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19 check-ins using file src/pcache1.c version 2610bceb

2011-01-28
03:13
Reactivate the analyze5.test script. (Closed-Leaf check-in: a2a9f640 user: drh tags: stat2-enhancement)
01:57
Change the weighting of binary searches on tables to 1/10th the cost of a search on an index. Change the assumed reduction in search space from a indexed range constraint from 1/3rd to 1/4th. Do not let the estimated number of rows drop below 1. (check-in: 4847c6cb user: drh tags: stat2-enhancement)
2011-01-24
20:18
Modify the test_quote.c demonstration shim so that it works when SQLITE_THREADSAFE=0 is defined. (check-in: b70bccca user: drh tags: trunk)
19:45
Fix a typo in the documentation for sqlite3_snprintf(). No changes to code. (check-in: 8d106541 user: drh tags: trunk)
19:14
Fix a harmless compiler warning (a shadowed local variable) in analyze.c. (check-in: a1ad7fb3 user: drh tags: trunk)
17:46
Restructuring and generalizing analyze5.test. The whole script is currently disabled and will need to be reenabled prior to merging with trunk. (check-in: 31fcc706 user: drh tags: stat2-enhancement)
16:00
Ensure that if a deferred FK constraint is violated by a statement that creates its own implicit transaction, the statement is not an "active-write" after sqlite3_step() returns. (Closed-Leaf check-in: 8063197e user: dan tags: deferred-fk-quirk)
15:11
Change the cost estimator in the query planner to take into account the logN rowid lookup cost when going from an index to a table. (check-in: b442525b user: drh tags: stat2-enhancement)
2011-01-22
13:32
Modify the trace callback mechanism so that SQL commands executed from within virtual table or user function callbacks are passed to the trace callback without parameter expansion and enclosed in SQL comments. (check-in: a764915b user: dan tags: trunk)
00:10
Add the ability to use indices for constraints of the form "x IS NOT NULL" when sqlite_stat2 is available and most entries for column x are NULL. (check-in: 5d5bddd2 user: drh tags: stat2-enhancement)
2011-01-21
18:25
Change sqlite3StrAccumAppend() to use realloc instead of malloc. (check-in: 380f61df user: dan tags: trunk)
18:18
Adjustments to the result row estimator for the IN operator so that it gives the same estimates as the equivalent OR operator. Test cases for the same. (check-in: c82cb9c0 user: drh tags: stat2-enhancement)
16:27
Make use of histogram data to make better estimates for the number of rows that will be returned from "x IN (v1,v2,v3,...)" constraints. (check-in: fd3977a2 user: drh tags: stat2-enhancement)
15:52
Add options to test command [do_faultsim_test] to support testing VFS implementations. (check-in: 503ad889 user: dan tags: trunk)
14:37
Add the ability to use indices when a range contraint is bounded on the lower end by NULL. (check-in: f73a167b user: drh tags: stat2-enhancement)
2011-01-20
20:36
Update ANALYZE test cases to check out the use of histograms for equality constraints. (check-in: c7b59afa user: drh tags: stat2-enhancement)
16:52
Use histogram data to improve the row-count estimates on equality constraints. (check-in: 6bfc5c69 user: drh tags: stat2-enhancement)
02:56
The first of a planned series of enhancements to the query planner that enable it to make better use of sqlite_stat2 histograms when the table has many repeated values. (check-in: 2cd374cd user: drh tags: stat2-enhancement)
2011-01-19
21:58
Comment improvements in pcache1.c. No changes to code. (check-in: 9660a0a2 user: drh tags: trunk)