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57 events for the month beginning 2021-07-01 by user drh
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2021-07-31
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| 20:30 | Refactor the way that DEFAULT expressions are stored on columns, in order to save memory in the common case where the column has no DEFAULT clause. (check-in: 8646547e user: drh tags: trunk) | |
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2021-07-30
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| 23:30 | Recognize certain standard datatypes ("INT", "INTEGER", "REAL", "TEXT", and "BLOB") and if a column has one of those datatypes, store the type part of the bit-field information in the Column structure to save space. (check-in: d2da62a9 user: drh tags: trunk) | |
| 20:09 | If a generated column uses the optional keywords GENERATE ALWAYS, try to avoid putting those keywords in the typename of the column. Forum post ff3ffe09251c105b (check-in: 3c954863 user: drh tags: trunk) | |
| 18:39 | Avoid clownfeet in the names columns when the column names are quoted in the original CREATE TABLE statement. (check-in: 980f7292 user: drh tags: trunk) | |
| 12:47 | Reduce clownfooting in the allocation of the Table.aCol array. This reduces the amount of heap space required to hold large schemas by about 11%. (check-in: 2941ded0 user: drh tags: trunk) | |
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2021-07-29
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| 18:34 | Enhance the wal.c source file with an ASCII-art schematic of the -shm file header. (check-in: a6c160e0 user: drh tags: trunk) | |
| 17:31 | Improvements to asserts to enforce magic numbers in the wal-index format. Also improve automatic configure and make builds on legacy PPC iBooks. (check-in: 87b8d478 user: drh tags: trunk) | |
| 17:23 | Complete warning-free build on old PPC iBook. (Closed-Leaf check-in: ef2a0850 user: drh tags: wal-asserts) | |
| 17:01 | Fix an error in one of the assert() statements added by [23b08fe9db24a953]. (check-in: ad24334b user: drh tags: wal-asserts) | |
| 16:52 | • Edit [23b08fe9db24a953|23b08fe9]: Move to branch wal-asserts. (artifact: 56bc5eed user: drh) | |
| 16:49 | Minor tweaks to various TCL build scripts so that they work even for TCL 8.4, which is obsolete, but is also all that is available for some legacy platforms. (check-in: 2269ce64 user: drh tags: wal-asserts) | |
| 16:48 | Improve comments and add new assert() statements in WAL to help document how everything works. (check-in: 23b08fe9 user: drh tags: wal-asserts) | |
| 14:27 | Merge the latest enhancements from trunk. (Leaf check-in: 8498d772 user: drh tags: win-blocking-locks) | |
| 00:33 | Remove ALWAYS() macros that can be true if the internal test function implies_nonnull_row() is used in the result set of a query and contains comparison operator against a computed column. dbsqlfuzz 4c34db5bff6247f33ee49e341a1f3018e72be0a0. (check-in: 4d1dbfa3 user: drh tags: trunk) | |
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2021-07-28
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| 02:04 | Fix a harmless uninitialized variable read that occurs after an error associated with a subquery that uses DISTINCT. Found by a fuzzer. (check-in: e9719f97 user: drh tags: trunk) | |
| 01:22 | Reduce the scope of a variable in order to fix a harmless compiler warning that occurs under -DSQLITE_OMIT_AUTOMATIC_INDEX. (check-in: 36d5dbbe user: drh tags: trunk) | |
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2021-07-27
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| 15:46 | • Edit [05b573fdb27abec7|05b573fd]: Edit check-in comment. (artifact: b9e283f2 user: drh) | |
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2021-07-23
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| 23:49 | • Fixed ticket [c88f3036]: ALTER TABLE DROP COLUMN may corrupt data plus 5 other changes (artifact: 8840c8df user: drh) | |
| 19:26 | Merge the ".connection" CLI enhancement from trunk. (check-in: d317d44f user: drh tags: win-blocking-locks) | |
| 18:43 | Enhance the CLI with the ".connection" command that can switch between up to five different database connections. Used for manual testing of multiple database connections in the same process. (check-in: 54eaf076 user: drh tags: trunk) | |
| 14:53 | Merge recent enhancements on trunk into the win-blocking-locks branch. (check-in: 9ecad2f8 user: drh tags: win-blocking-locks) | |
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2021-07-22
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| 21:11 | Set the checkSchema flag if a CREATE TABLE parse fails because the table already exists, to ensure that the table was not previously deleted by some other connection. (check-in: 91bcb962 user: drh tags: trunk) | |
| 18:22 | Fix ALTER TABLE DROP COLUMN so that it generates valid bytecode even when operating on a corrupt database and using PRAGMA writable_schema=ON. dbsqlfuzz 5f09e7bcc78b4954d06bf9f2400d7715f48d1fef (check-in: b65f4f76 user: drh tags: trunk) | |
| 16:07 | One of the optimizations of check-in [de9c86c9e4cdb34f] does not work for terms originating in the ON/USING clause, as demonstrated by forum post 6cf3bb457c3f4685. This check-in disables that optimization for ON/USING terms. Also improve the TreeView display for the resulting "true"/"false" nodes to show that they originate from the ON/USING clause. Add a testcase() to the other optimization to show that it can still be used for ON/USING terms. (check-in: 1f679604 user: drh tags: trunk) | |
| 16:01 | • Edit [de9c86c9e4cdb34f|de9c86c9]: Edit check-in comment. (artifact: f5db8feb user: drh) | |
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2021-07-21
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| 15:42 | Improved robustness of cursor renumbering in the UNION ALL flattener when operating on vector assignments of an UPDATE FROM. dbsqlfuzz 417d2b053b9b3c9edaf22dd515564f06999e029c (check-in: 60695359 user: drh tags: trunk) | |
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2021-07-20
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| 16:07 | Run a "PRAGMA quick_check", if necessary, on the modified table after an ALTER TABLE ADD COLUMN to verify that added NOT NULL or CHECK constraints are satisfied by existing rows. Abort the ADD COLUMN if not. Forum post c04814903d6ec4f7. (check-in: e3794997 user: drh tags: trunk) | |
| 08:23 | Fix issues in the new ADD COLUMN constraint checking. Add preliminary test cases. (Closed-Leaf check-in: 48434ad3 user: drh tags: add-column-constraint-check) | |
| 07:35 | Demonstration code to show how NOT NULL and CHECK constraints can be verified after an ALTER TABLE ADD COLUMN. (check-in: 039f5403 user: drh tags: add-column-constraint-check) | |
| 02:02 | It does not work to deserialized into TEMP, so do not allow it. The sqlite3_deserialize() routine now returns SQLITE_ERROR if you try. (check-in: 18068cc6 user: drh tags: trunk) | |
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2021-07-19
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| 20:52 | More precision in comparing integers and floating point values while processing the integer primary key for OP_SeekGE and similar. Forum post 2bdb86a068. (check-in: f9c6426d user: drh tags: trunk) | |
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2021-07-16
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| 22:43 | Try to omit the ORDER BY clause in subqueries if doing so does not change the result in any way. See Forum post 2d76f2bcf65d256a for details and history. (check-in: 85ddaf1b user: drh tags: trunk) | |
| 20:16 | Minor comment improvements. (Closed-Leaf check-in: 6854b591 user: drh tags: omit-subquery-order-by) | |
| 17:04 | Modify the generate_series() table-valued functions so that its first argument (the START value) is required. Throw an error if that argument is not supplied. In this was the series.c loadable extension can be used as a demonstration of how to code an xBestIndex function to require certain parameters. Compile with -DZERO_ARGUMENT_GENERATE_SERIES to obtain the legacy behavior. (check-in: 459d85a2 user: drh tags: trunk) | |
| 15:30 | Fix the "main.mk" makefile so that "series.c" is a dependency of "shell.c". (check-in: ff959917 user: drh tags: trunk) | |
| 01:19 | Get the "omit ORDER BY in FROM-clause subqueries" optimization working for the core test cases. (check-in: e31c5888 user: drh tags: omit-subquery-order-by) | |
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2021-07-15
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| 19:29 | Attempt to omit ORDER BY clauses from FROM-clause subqueries if those ORDER BY clauses do not affect the output. See forum thread 2d76f2bcf65d256a for discussion. This can help the query flattener in some cases, resulting in faster query plans. The current implemention does not always work. (check-in: ef97c3e7 user: drh tags: omit-subquery-order-by) | |
| 16:39 | Change references to the schema table in sqlite3_analyzer to the new SQLITE_SCHEMA name. (check-in: 3beb77d6 user: drh tags: trunk) | |
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2021-07-14
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| 19:35 | Enhance the Windows VFS to recognize SQLITE_FCNTL_LOCK_TIMEOUT and make the value set there available to the winLockFile() function. (check-in: 954b5d61 user: drh tags: win-blocking-locks) | |
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2021-07-09
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| 17:24 | • Edit [f14d3571598ce338|f14d3571]: Move to branch disused-link-macros. (artifact: 12bebdd4 user: drh) | |
| 16:00 | Remove disused linkage macros. (Leaf check-in: f14d3571 user: drh tags: disused-link-macros) | |
| 13:52 | Enhance the sqlite3_create_function() interfaces to assume a value of SQLITE_UTF8 is presented with a nonsense value for the preferred encoding. This is undocumented behavior added for robustness. (check-in: c1bb5cff user: drh tags: trunk) | |
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2021-07-08
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| 12:12 | Fix an issue with the SQLite Expert extension when a column has no collating sequence. Forum post 78165fa250. (check-in: b1e0c22e user: drh tags: trunk) | |
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2021-07-07
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| 19:44 | Fix a harmless compiler warning in the "fuzzcheck" test program. (check-in: 8c432642 user: drh tags: trunk) | |
| 19:40 | Fix a harmless compiler warning - duplicate local variable named "pRHS". (check-in: 5bc05faf user: drh tags: trunk) | |
| 16:48 | Follow-up to [68db1ff9c44fa9c3]: The number of registers needed by PRAGMA foreign_key_check was increased too late for an assert() deep down inside of sqlite3ExprCode(). So move the size increase a little earlier. Forum post 79c9e4797d. (check-in: 7072404a user: drh tags: trunk) | |
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2021-07-05
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| 18:37 | Add the ATOMIC_INTRINSICS compile-time output output. Move sqlite3Int.h in front of ctime.c so that default values that are not overridden are shown in PRAGMA compile-time option output. (check-in: e3069526 user: drh tags: trunk) | |
| 02:40 | Improved rebustness in sqlite3ExprListDup() when it contains a vector assignment from an UPDATE where the initial term is omitted. This can happen during a UNION ALL query flattening while processing a virtual table update in which the first term of the vector is repeated. Forum post 16ca0e9f32. (check-in: 2547cfe3 user: drh tags: trunk) | |
| 01:11 | Ensure that TK_SELECT_COLUMN Expr nodes always have their iTable field set to to the number of columns in the vector. This is not strictly necessary. It just simplifies the state description and make the code easier to reason about. (check-in: 026f08d4 user: drh tags: trunk) | |
| 00:07 | Fix an incorrect comment on testcase misc1-27.0. No changes to code. (check-in: 49829ae3 user: drh tags: trunk) | |
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2021-07-04
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| 22:33 | Enhance the treeview debugging mechanism so that it correctly deals with TK_ROW expression nodes. (check-in: e87fdb65 user: drh tags: trunk) | |
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2021-07-03
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| 18:57 | Fix a (harmless) typo in a comment. No code changes. (check-in: d2b9b8da user: drh tags: trunk) | |
| 02:55 | In the PRAGMA foreign_key_check, ensure that sufficient registers are allocated for the virtual machine, even if one or more foreign keys reuses the same column multiple times and has more columns than the table it is part of. Forum post a6b0c05277. (check-in: 68db1ff9 user: drh tags: trunk) | |
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2021-07-02
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| 12:25 | Put ALWAYS() on a branch that is always true due to [d4097364c511709b]. Fix a testcase precondition associated with the same check-in. (check-in: 55e2fbeb user: drh tags: trunk) | |
| 12:08 | Fix a harmless assertion fault discovered by OSSFuzz. The assertion fault is harmless because the assert() checks a condition that that is harmless if false and the assert() is disabled in production builds. (check-in: 79443aab user: drh tags: trunk) | |
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2021-07-01
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| 18:26 | • Edit [d4097364c511709b|d4097364]: Edit check-in comment. (artifact: 7578befb user: drh) | |
| 16:57 | Import the updated nmakehlp.c file used by the TCL Extension Architecture (TEA) builds in the amalgamation tarballs. Forum post 5a5001f20a. (check-in: 595bf95b user: drh tags: trunk) | |