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34 check-ins using file src/vdbeInt.h version 2a45270d

2018-09-29
19:38
Add the PRAGMA table_vinfo command (with an extra "v" before "info") that works like PRAGMA table_info (without the "v") except that it also shows hidden columns on virtual tables. check-in: 8bcd1a59 user: drh tags: pragma-table-vinfo
2018-08-04
15:53
Further logic simplifications that flow out of the omission of the column cache. check-in: 7d9072b0 user: drh tags: omit-column-cache
15:28
Add test cases for the constant expression fix of the previous check-in. check-in: 95db5bd9 user: drh tags: trunk
15:16
Ensure that all expressions that are to be evaluated once at the start of a prepared statement (the Parse.pConstExpr expressions) pass the sqlite3ExprIsConstantNotJoin() test. It is not sufficient to pass just the sqlite3ExprIsConstant() test as that would allow through column references that are bound to constants by the WHERE clause in the constant propagation optimization. This fixes a problem discovered by OSSFuzz. check-in: 8bc7f84c user: drh tags: trunk
14:30
Remove additional traces of the column cache. check-in: db6052e9 user: drh tags: omit-column-cache
2018-08-03
23:04
Completely remove the column cache logic, which has been a persistent source of bugs for many years. Due to recent enhancements to the performance of the OP_Column opcode, removing the column cache actually makes speed-check.sh run faster. Removing the column cache also saves about 1,800 bytes of code space. check-in: 3f5f60cd user: drh tags: omit-column-cache
20:19
Fix the handling of sub-queries with LIMIT clauses by the optimization activated by compile-time symbol SQLITE_COUNTOFVIEW_OPTIMIZATION. check-in: 21235d9a user: dan tags: trunk
15:58
Fix the OP_SeekRowid opcode so that it has no type-change side-effects on the key register in P3. This fixes an obcure problem that arises when doing equi-joins between a table with a TEXT column against another table with an INTEGER PRIMARY KEY. The original problem was discovered when OSSFuzz created such a query and hit an assert() in OP_VerifyTabCol that was specifically designed to catch these kinds of errors at run-time. Test cases for this fix are in TH3. check-in: fa94b49e user: drh tags: trunk
13:56
Improve "PRAGMA vdbe_trace=ON" to always show the key values for the OP_IdxGT and related opcodes. check-in: 0f881955 user: drh tags: trunk
2018-07-29
18:56
In the command-line shell, always exit if realloc() fails. check-in: e390023c user: drh tags: trunk
2018-07-28
21:01
Add a small cost penalty to sorting to bias the query planner in favor of plans that do not require a final sorting pass. check-in: 85b9beb4 user: drh tags: trunk
16:24
Do not allow a column reference that is converted into a constant by the WHERE-clause constant propagation optimization to be moved to the init-time constant expression list, as the table reference will not work there. This fixes a problem found by OSSFuzz. check-in: d30b2a94 user: drh tags: trunk
14:56
Fix an assert() statement that was made obsolete by the constant propagation enhancement. Problem discovered by OSSFuzz. check-in: e4b4737e user: drh tags: trunk
14:34
Improved debugging output when the ".selecttrace" option is used in the shell. check-in: fcb88dd6 user: drh tags: trunk
13:37
An early attempt at refactoring Expr Closed-Leaf check-in: fc90a53d user: drh tags: expr-simplify-branch1
01:30
Add assert() statements to sqlite3ExprDelete() that prove various symmetry properties of the Expr object that might be exploited to make the Expr object smaller and faster. check-in: 81f25d5c user: drh tags: expr-simplify
2018-07-27
23:33
Improvements to the parser to increase coverage. Fix the parser so that at least one expresssion is required after PARTITION BY and within the list of expressions on VALUES(). check-in: 02204f8b user: drh tags: trunk
22:55
When doing a DROP VIEW do not try to delete entries from the sqlite_stat1 table as there are none. check-in: 7efdba2b user: drh tags: trunk
22:14
Minor grammar changes that help the parser run faster by reducing the number of NUL rule reductions. check-in: cfd1b005 user: drh tags: trunk
20:45
Enhance Makefile for MSVC to support building the shell tool without using the amalgamation. check-in: 3d815d83 user: mistachkin tags: trunk
20:37
The WHERE-clause constant propagation optimization attempts to use transitive laws to replace column values with constants in the WHERE clause in order to help to query planner make more aggressive optimizations. check-in: f4229707 user: drh tags: trunk
20:01
Reduce the performance cost of the constant propagation optimization to less than 200,000 cycles. Closed-Leaf check-in: 865249de user: drh tags: propagate-const-opt
18:19
Performance improvement to sqlite3ExprCollSeq(). With this change, the performance of speed-check.sh is within 400,000 cycles of trunk. check-in: a5f86f49 user: drh tags: propagate-const-opt
18:12
Faster implementation of sqlite3IsBinary(). check-in: be05d0db user: drh tags: propagate-const-opt
17:51
Only run the constant propagation optimization on joins since that is the only scenario where it is useful. This saves prepare time for the common case of a simple query. check-in: 598d6083 user: drh tags: propagate-const-opt
16:57
Constant propagation is now restricted to just the WHERE clause. The mechanism is changed to take affinity and collation into account. This seems to give correct answers. But the search for constant propagation costs 4 million cycles in the speed test. check-in: 82c67efb user: drh tags: propagate-const-opt
2018-07-26
23:54
Add a test case demonstrating the collation problem with constant propagation. check-in: 50add839 user: drh tags: propagate-const-opt
23:47
Generalize the constant propagation optimization so that it applies on every WHERE close, not just those that contain a subquery. This then demonstrates that the current implementation is inadequate since it does not take into account collating sequences. check-in: 57eb2abd user: drh tags: propagate-const-opt
21:48
In the unix VFS, give every unixInodeInfo object its own mutex, rather than using the global VFS mutex, to improve concurrency in cases where there are many threads operating on separate database files. check-in: 22f47cf4 user: drh tags: trunk
21:16
Initial implementation of the WHERE-clause constant propagation optimization. check-in: 2fb82ad8 user: drh tags: propagate-const-opt
2018-07-25
15:25
Fix a buffer overread in fts5. check-in: 0e3de8ab user: dan tags: trunk
15:12
Keep generated opcode values grouped together when required, even when they do not correspond to a token. check-in: 6ee2950b user: mistachkin tags: trunk
07:29
Fix a typo in the documentation for sqlite3_snapshot_get(). check-in: cd9713c9 user: dan tags: trunk
2018-07-24
22:02
Do not abort running queries due to a CREATE INDEX statement. Allow them to run to completion before being reprepared. Fix for ticket [c694113e50321afdf9]. check-in: 2bd59333 user: drh tags: trunk