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78 events for the month beginning 2017-04-01 by user drh
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2017-04-29
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| 19:29 | Add a single testcase() macro to the subquery processing logic. (check-in: 4e1df76e user: drh tags: trunk) | |
| 18:02 | Improvements to opcode documentation in the bytecode engine. No changes to code. (check-in: e54c9f8d user: drh tags: trunk) | |
| 15:27 | Evaluate WHERE clause terms that reference only the index before evaluating terms that require the table, and thereby avoid seeking the table row if index terms are false. This is called the "push-down" optimization in the MySQL world, we are told. Do not confuse with WHERE-clause push-down. (check-in: d7bb79ed user: drh tags: trunk) | |
| 14:56 | Minor size and performance improvements to the push-down optimization. (Closed-Leaf check-in: 91dfb61a user: drh tags: pushdown-optimization) | |
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2017-04-26
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| 04:32 | Fix a subtle bug in Lemon discovered and reported on the mailing list by Kelvin Sherlock, who also suggested the correct fix. (check-in: 304689f8 user: drh tags: trunk) | |
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2017-04-24
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| 16:14 | Bring in all the latest enhancements from trunk. (check-in: 031feebc user: drh tags: apple-osx) | |
| 13:49 | • New ticket [61fe9745] Duplicate result using an IN operator in the WHERE clause. (artifact: dde67a53 user: drh) | |
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2017-04-22
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| 00:20 | Fix an assertion fault found by OSSFuzz. (check-in: e39769f4 user: drh tags: trunk) | |
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2017-04-18
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| 11:20 | Improved optimizations of views as the right operand of a LEFT JOIN. (check-in: 41c27bc0 user: drh tags: trunk) | |
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2017-04-17
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| 23:23 | Defer checking for null in the comparison operators, since that is an uncommon case. (check-in: 56845256 user: drh tags: trunk) | |
| 20:50 | Do not allow a Mem object to be both NULL and some other type at the same time. (check-in: e698db19 user: drh tags: trunk) | |
| 13:18 | Fix the ".column" output mode in the command-line shell so that it correctly counts and formats multi-byte UTF characters. (check-in: f508aff8 user: drh tags: trunk) | |
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2017-04-16
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| 22:41 | In the showwal command-line tool, for unix builds, if the auxiliary argument is of the form "Ntruncate" where "N" is a frame number, then truncate the WAL file after the N-th frame. (check-in: 90015df3 user: drh tags: trunk) | |
| 22:08 | Add the anycollseq.c loadable extension in etc/misc (check-in: d7b9813c user: drh tags: trunk) | |
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2017-04-15
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| 11:53 | In the skip-ahead-distinct optimization, fix a bug in the logic that determines when to invoke the optimization based on sqlite_stat1 statistics. (check-in: 89f9e436 user: drh tags: trunk) | |
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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) | |
| 22:40 | • Edit [1aa0ea8db7580aff|1aa0ea8d]: Remove the "Closed" mark. (artifact: 98140a55 user: drh) | |
| 21:44 | • Edit [a53799059d4ece24|a5379905]: Edit check-in comment. (artifact: 169fa8ed user: drh) | |
| 19:46 | Remove end-of-line whitespace from lemon.c. (check-in: d78355c8 user: drh tags: trunk) | |
| 19:44 | Fix some left-over K&R-C constructs in lemon.c. No changes to the core. (check-in: a5379905 user: drh tags: trunk) | |
| 19:03 | Add the TK_IF_NULL_ROW opcode to deal with non-NULL result columns in the result set of a view or subquery on the RHS of a LEFT JOIN that gets flattened. (Closed-Leaf check-in: 3a5860d8 user: drh tags: left-join-view) | |
| 17:30 | When doing a DISTINCT query using an index, try to use the index to skip ahead to the next distinct element, rather than doing a full scan of the index. (This is the "skip-ahead-distinct" optimization.) (check-in: f489b5bb user: drh tags: trunk) | |
| 17:20 | • Edit [8183fa6829e8688d|8183fa68]: Mark "Closed". (artifact: 05af424b user: drh) | |
| 17:18 | An initial attempt to optimize VIEWs that occur as the right operand of a LEFT JOIN. This particular check-in does not work correctly because it does not deal with the case of columns in the VIEW that return non-NULL even when all columns in the table of the VIEW are NULL because of the LEFT JOIN. (check-in: 1838a59c user: drh tags: left-join-view) | |
| 14:02 | Enhance the sqlite3TreeView() display for Expr objects so that it shows the iRightJoinTable value for Expr nodes that have the EP_FromJoin property. (check-in: 5159cb8f user: drh tags: trunk) | |
| 12:39 | Simplify the interface to the subst() routines that are part of the query flattener by collecting common parameters into the SubstContext object and passing around a pointer to that object. (check-in: e651074b user: drh tags: trunk) | |
| 12:27 | Remove an incorrect ALWAYS(). (check-in: f956f6ae user: drh tags: trunk) | |
| 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) | |
| 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) | |
| 00:12 | Fix a regression caused by the fix for ticket [6c9b5514077fed34551f98e64c09a1] - control characters allowed in JSON. (check-in: 8e7b6118 user: drh tags: trunk) | |
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2017-04-12
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| 17:38 | Improved \n and \r escapes in the ext/misc/dbdump.c utility function. The implementation of dbdump.c now matches the implementation in the CLI. (check-in: f2643315 user: drh tags: trunk) | |
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2017-04-11
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| 18:55 | • Fixed ticket [981329ad]: Stack overflow while parsing deeply nested JSON plus 5 other changes (artifact: 86a95386 user: drh) | |
| 18:55 | Limit the depth of recursion for valid JSON in the JSON1 extension in order to avoid using excess stack space in the recursive descent parser. Fix for ticket [981329adeef51011052667a9]. (check-in: 1f68c184 user: drh tags: trunk) | |
| 18:09 | • New ticket [981329ad] Stack overflow while parsing deeply nested JSON. (artifact: 85802dae user: drh) | |
| 18:06 | Smaller and faster implementation of exprMightBeIndexed(). (check-in: 76cd611d user: drh tags: trunk) | |
| 16:44 | Very slight smaller and faster sqlite3SelectNew() (check-in: 4143650c user: drh tags: trunk) | |
| 12:20 | Add an ALWAYS() around an unreachable condition in sqlite3VdbeMemGrow(). (check-in: 0f3eb61f user: drh tags: trunk) | |
| 01:30 | When evaluating a query that uses an index on an expression, try to use the expression values read directly from the index rather than reevaluating the expression. (check-in: a47efb7c user: drh tags: trunk) | |
| 01:01 | Improved comments. Fix a problem when an indexed expression is used in an ORDER BY clause. (Closed-Leaf check-in: c59eaf2b user: drh tags: covering-index-on-expr) | |
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2017-04-10
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| 23:42 | Merge changes from trunk. (check-in: 8978465f user: drh tags: covering-index-on-expr) | |
| 20:51 | Smaller and faster vdbeFreeOpArray() (check-in: e052436d user: drh tags: trunk) | |
| 20:27 | Slightly smaller and faster sqlite3VdbeMemGrow(). (check-in: efd1702a user: drh tags: trunk) | |
| 12:31 | Add a new JSON test case to verify that all control characters are escaped in the json_quote() function. (check-in: 6ee12221 user: drh tags: trunk) | |
| 12:25 | • Fixed ticket [6c9b5514]: JSON allows unescaped control characters in strings plus 5 other changes (artifact: a2343249 user: drh) | |
| 12:25 | Change the JSON extension so that it disallows control characters inside of strings. Fix for ticket [6c9b5514077fed34551f98e64c09a10dc2fc8e16]. (check-in: 475d8f82 user: drh tags: trunk) | |
| 12:14 | • New ticket [6c9b5514] JSON allows unescaped control characters in strings. (artifact: e6bb692a user: drh) | |
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2017-04-09
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| 19:23 | Do not expose the name of the internal Mem object in the public interface defined by sqlite3.h. (check-in: 19dd753f user: drh tags: trunk) | |
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2017-04-08
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| 18:24 | Merge all recent changes from trunk. (check-in: c23ef5e2 user: drh tags: apple-osx) | |
| 18:18 | • Fixed ticket [b93be872]: JSON extension accepts invalid numeric values plus 5 other changes (artifact: 39c0f43a user: drh) | |
| 18:18 | Disallow leading zeros on numeric constants in JSON. Fix for ticket [b93be8729a895a528e2] (check-in: 204e72f0 user: drh tags: trunk) | |
| 17:54 | • New ticket [b93be872] JSON extension accepts invalid numeric values. (artifact: 72ad25bf user: drh) | |
| 13:42 | Fix the quoting mechanism for ".dump" so that it is not applied for the ".mode quote" output. (check-in: 78c1e903 user: drh tags: trunk) | |
| 01:09 | Make sure the RTree sqlite3_blob handle is reset prior to renaming the table. (check-in: 1cdae2db user: drh tags: trunk) | |
| 00:55 | Fix the ".dump" command so that it works with ".headers on". Also fix the display of ".mode insert" with ".headers on". (check-in: a6ce57ee user: drh tags: trunk) | |
| 00:25 | Merge the latest trunk changes. (check-in: dd16439e user: drh tags: apple-osx) | |
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2017-04-07
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| 20:20 | Use replace() instead of char() to quote newline and return characters in strings in the output of .dump, to avoid excess expression complexity. (check-in: 73073529 user: drh tags: trunk) | |
| 19:52 | Remove an unused token type. (check-in: 13a42223 user: drh tags: covering-index-on-expr) | |
| 19:41 | Proof of concept for the ability to use the expression columns in an index on expressions in place of equivalent expressions in the result set or in the WHERE clause. This check-in compiles but is mostly untested. (check-in: a52ef2ad user: drh tags: covering-index-on-expr) | |
| 11:45 | Use replace() instead of char() to quote newline and return characters in strings in the output of .dump, to avoid excess expression complexity. (Closed-Leaf check-in: 4c2b5729 user: drh tags: shell-fix) | |
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2017-04-05
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| 13:44 | Remove a confusing and pointless sentence from the documentation for the sqlite3_interrupt() interface. (check-in: c5f1a2b6 user: drh tags: trunk) | |
| 12:39 | Split off sqlite3DbFreeNN() from sqlite3DbFree() and use it in cases where we know that the argument to be freed is never NULL. (check-in: ad90e8bb user: drh tags: trunk) | |
| 11:57 | Save a few bytes and a few CPU cycles in sqlite3ExprListDelete() routine. (check-in: 9e6c9391 user: drh tags: trunk) | |
| 11:49 | Remove a conditional made unreachable by the previous ExprList enhancement. (check-in: a1cf4476 user: drh tags: trunk) | |
| 11:32 | Combine the ExprList_item objects and the ExprList wrapper into a single memory allocation, for improved performance and reduced footprint. (check-in: 2b6560ad user: drh tags: trunk) | |
| 10:54 | Attempt to remove bash-isms from configure.ac. Use -O0 with --enable-debug. (check-in: 71ed35cc user: drh tags: trunk) | |
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2017-04-03
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| 14:07 | Avoid an unnecessary call to sqlite3WhereGetMask() inside of whereShortCut(). (check-in: 5c11f430 user: drh tags: trunk) | |
| 13:33 | Force a schema load prior to "PRAGMA optimize". (check-in: 86897c24 user: drh tags: trunk) | |
| 13:17 | Fix typos in the documentation for OP_Column. (check-in: 777b43e6 user: drh tags: trunk) | |
| 12:04 | Slightly smaller and faster implementation for vdbeSorterCompareInt(). (check-in: 84fa069c user: drh tags: trunk) | |
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2017-04-01
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| 20:44 | Remove an unnecessary setting of the Mem.enc field for the output of the OP_Record opcode, for a performance improvement and size reduction. (check-in: e6e36b28 user: drh tags: trunk) | |
| 20:14 | Minor performance enhancements to the OP_Affinity opcode. (check-in: c45cd3b9 user: drh tags: trunk) | |
| 19:45 | Remove an unnecessary clearing of the Vdbe.iCurrentTime value. (check-in: fcd2acdd user: drh tags: trunk) | |
| 11:59 | Faster implementation for sqlite3VdbeIntValue() and sqlite3VdbeRealValue(). (check-in: 8698df60 user: drh tags: trunk) | |
| 11:40 | Remove unused fields from the BtCursor object. (check-in: 1c0d82e0 user: drh tags: trunk) | |
| 00:20 | Save a 78 bytes of code space and a million CPU cycles in speedtest1 by storing the cell index for the leaf page in the BtCursor object in its own field (BtCursor.ix), rather than as an entry in the BtCursor.aiIdx array. (check-in: 2452f061 user: drh tags: trunk) | |