e724d3d26a
Add a comment explaining why WhereLoop cost adjustments are omitted for
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skip-scan loops.
FossilOrigin-Name: 3bc43594aaeee9225c0590677fcce480bedcb37b
2014-05-02 00:09:40 +00:00
3852413246
Fix an obscure problem to do with temp register allocation that could occur if more than one simple SELECT within a compound SELECT uses a partial sort.
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FossilOrigin-Name: 427409ae106cdab7892a6b50fe30c5f52de5addc
2014-05-01 20:26:48 +00:00
c5f246eb37
Add #ifdefs for test coverage. Add a testcase().
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FossilOrigin-Name: be2702ce35c713b33c9b7689643b45fb0de6af2a
2014-05-01 20:24:21 +00:00
5da73e1a09
Fix a problem in calculating the costs of "OR" scans.
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FossilOrigin-Name: 9bbca48b42e4fe16f2188e18dc736da30a96435c
2014-04-30 18:11:55 +00:00
8164722c58
Add text to the header comment of whereLoopAddBtree() describing how the costs of various b-tree loops are estimated.
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FossilOrigin-Name: 05e6e16cb28c9ffb4596bd2ef81f687c5403ecbb
2014-04-30 15:00:16 +00:00
4a6b8a05cd
Fix a couple of out-of-date comments in where.c.
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FossilOrigin-Name: eefeda32d54efbbdf7d20b719299eda48b891fae
2014-04-30 14:47:01 +00:00
224155dd1c
Fix long-standing typos in comments.
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FossilOrigin-Name: b9f91317c34d07769a95dc2f905a6ccabceb64a3
2014-04-30 13:19:09 +00:00
264d2b97a9
Test that the default values used when sqlite_stat1 data is not available are calculated correctly. Fixes for the same.
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FossilOrigin-Name: e2d42f909de85a0586389f2dc0e654f7af2e351a
2014-04-29 19:01:57 +00:00
e4618fb30d
Merge trunk changes into this branch.
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FossilOrigin-Name: d74299f037f3a6a4b3bce8b4d1c76c407c1f3b3e
2014-04-29 16:46:24 +00:00
09e1df6c00
Ignore likelihood() values on indexed IPK lookups.
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FossilOrigin-Name: 5bb7757a7b32a74482d3e93e9c9eea02273fe981
2014-04-29 16:10:22 +00:00
7de2a1faf6
Do not reduce the number of rows scanned at all for "IS NOT NULL" constraints. Fix a bug in calculating the number of rows visited by scans of partial indicies.
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FossilOrigin-Name: a8ae93f0cffa116df0ba34d46a53f49d42dace41
2014-04-28 20:11:20 +00:00
42685f211e
The trunk assumes that an open range constraint on an indexed term (col>?) term matches 1/4 of the indexed rows, and that a closed constraint (col BETWEEN ? AND ?) matches 1/64. Change this branch to do the same.
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FossilOrigin-Name: 4047ac75e2a8f0b330255501c42e4f04e5ab500d
2014-04-28 19:34:06 +00:00
65e6b0dd12
Add the sqlite3_rtree_query_callback() API to the RTree virtual table.
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(Cherrypick from the sessions branch.)
FossilOrigin-Name: af2cbe64adab5f9e3b0f3da00d06428088589d7f
2014-04-28 17:56:19 +00:00
e3bfbb7284
Modify internal function whereLoopAdjustCost() so that it does not prefer a skip-scan over a regular index scan even if the regular scan uses a subset of the WHERE terms used by the skip-scan.
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FossilOrigin-Name: 88a5758dcce891eb7be15432ebdc9f80071d413b
2014-04-28 09:35:31 +00:00
440e6ff3b0
Fix an error in estimating of the number of rows visited by a range scan.
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FossilOrigin-Name: d491de62fce69d93e89f65f7713972f7c2c451f7
2014-04-28 08:49:54 +00:00
2dd3cdcfab
Fix an sqlite3_stmt_status() problem caused by recent changs on this branch.
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FossilOrigin-Name: dee204092421a239f9f60ab83c3a5b3e24d1baea
2014-04-26 20:21:14 +00:00
453e0261df
Allow the xfer optimization to proceed if the DEFAULT on the very first
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column of the two tables is different. This is a refinement of the
fix for ticket [f67b41381a].
FossilOrigin-Name: 349f483499dd685a8da94923b6bd810a52e5e236
2014-04-26 17:52:08 +00:00
9940e2aa45
Avoid transfering records between tables unless the default values for all columns are the same. Fix for [f67b41381a].
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FossilOrigin-Name: f8c4c495e6de1f124d205383d4bafa46accbff5c
2014-04-26 14:07:57 +00:00
8ad1d8ba38
If the user provides likelihood() data for a WHERE clause term used as part of an index key, have the planner use it when calculating the expected number of rows visited by the loop.
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FossilOrigin-Name: c51efaa5d29ee0a91b9e6a83a8dd82530670811a
2014-04-25 20:22:45 +00:00
cfc9df76e1
Store values loaded from the stat1 table as logarithmic values in memory.
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FossilOrigin-Name: 1bd74c49ddab6f53bb6eaa57907eff44c2580dd6
2014-04-25 15:01:01 +00:00
9dfaf621d1
Make sure ORDER BY clauses on joins that involve virtual tables and that
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have a DISTINCT clause work correctly. This is a candidate fix for
ticket [388d01d4bb8f9]. Test cases for that ticket will be checked in
separately.
FossilOrigin-Name: 171138122690faafde0dcab0201b90bdf02d3637
2014-04-25 14:42:17 +00:00
a01c7c70fd
When VDBE_PROFILE is enabled, ignore negative opcode times, which sometimes
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occur, perhaps due to context swaps.
FossilOrigin-Name: 4e88042f9d3e678914da96c0eb276f3d8fca5a94
2014-04-25 12:35:31 +00:00
aa9933c115
Changes to the way the planner calculates the costs of various table and index scans. Some test cases still failing.
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FossilOrigin-Name: c5a6ec0a880652dc8f4593d9f7acd58ddc3dc5f3
2014-04-24 20:04:49 +00:00
374cd78c1d
Avoid discarding an ORDER BY clause in the case where an identical GROUP BY clauses uses an index to group, but not sort, the rows. Fix for [b75a9ca6b0].
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FossilOrigin-Name: de9a490f594183f337a2ec9e0f87792eac83548b
2014-04-21 13:21:56 +00:00
b355c2cc12
Clean up the proper-subset cost adjustment logic to make it more compact
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and easier to read and so that full branch test coverage is more easily
obtained.
FossilOrigin-Name: 9a5d38c79d2482a23bcfbc3ff35ca4fa269c768d
2014-04-18 22:20:31 +00:00
71794dbaeb
Add the SQLITE_RUNTIME_BYTEORDER compile-time option to force SQLite to check
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the processor byte-order at run-time. Add additional compile-time byte order
checks for ARM, PPC, and SPARC.
FossilOrigin-Name: 2c5363873a6f990a0abaacac6303acd46b48befc
2014-04-18 00:49:29 +00:00
2cf4acbd9f
Add the SQLITE_TESTCTRL_BYTEORDER test control to interrogate SQLite's notion
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of the processor byte order and whether the byte order is known at compile-time
or determined at run-time.
FossilOrigin-Name: 9c6961967ae00e563ebe2859eaf2639a79f2cb01
2014-04-18 00:06:02 +00:00
65b9ac5224
Make sure the undocumented sqlite_rename_parent() function does not
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crash even if it is invoked with NULL arguments.
Ticket [264b970c4379fd4b94]
FossilOrigin-Name: c6fa8d0d82805be230f672eabccdfa5680d4ddfd
2014-04-14 19:48:25 +00:00
d249090450
Remove the unused second argument from sqlite3ExprCachePop(). Add an
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ALWAYS() on an always-true conditional in sqlite3VdbeResolveLabel().
FossilOrigin-Name: ab23abf392175d3e256ff619b13abbbe732a49ed
2014-04-13 19:28:15 +00:00
87744513e7
Make sure column cache elements are cleared correctly when jumping over
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code for key generation in a partial index.
Fix for ticket [2ea3e9fe6379fc3f6].
FossilOrigin-Name: 3122b8364082be783821da01d4af2af6a9586327
2014-04-13 19:15:49 +00:00
d83cad235a
Modify the OR-clause handling so that it can safely deal with OR-clause
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with 17 or more terms. Fix for ticket [10fb063b1179be53ea0b53bb].
FossilOrigin-Name: a67b5312f63909737c052fe58ab5772d45530d49
2014-04-10 02:24:48 +00:00
48e080b26c
Performance improvements when reading large blobs, especially if
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SQLITE_DIRECT_OVERFLOW_READ is defined.
FossilOrigin-Name: 2312eb6a9eb31051db4e0baf19e033ba39adc7b1
2014-04-04 18:49:19 +00:00
853546d047
Merge changes to the query planner that strive to ensure that any index
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usage that is a proper subset of some other index usage always has a slightly
higher cost.
FossilOrigin-Name: 683dd379a293b2f330e1e4cd746f190527fe48ee
2014-04-04 18:20:35 +00:00
1fb6a11072
Ensure the "PRAGMA journal_mode=WAL" works coming from any other journal_mode
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with ATTACH-ed databases.
FossilOrigin-Name: e54330b43127e46fc6494748cbb353a6fc91cfd7
2014-04-04 14:12:52 +00:00
c438df1be0
Use OP_Copy instead of OP_SCopy when moving results out of a subquery,
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to prevent the subquery results from changing out from under the outer
query. Fix for ticket [1e64dd782a126f48d78].
FossilOrigin-Name: d5513dfa23baa0b0a095aaf17d19aacd30dcef61
2014-04-03 16:29:31 +00:00
831116d164
Fix a typo in the "Synopsis:" comment for the OP_VFilter opcode.
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FossilOrigin-Name: 48ecdd4aff03741f96c070dced69c3c273b652cb
2014-04-03 14:31:00 +00:00
54d0d2dd9a
In the command-line shell, run set writable_schema before running the
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".clone" command.
FossilOrigin-Name: 9d2ae6342c8afa904bec591ebe134ff7f536b71c
2014-04-03 00:32:13 +00:00
a38c9516e8
Remove an unnecessary conditional, replacing it with an assert().
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Improvements to comments.
FossilOrigin-Name: 834bf1c367e1ccd498c7f9f843be2d2aa11ffb3c
2014-04-01 01:24:34 +00:00
4c417181c2
Fix a compiler warning when SQLITE_DIRECT_OVERFLOW_READ is defined.
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Minor performance enhancement and size reduction.
FossilOrigin-Name: 96385dc460545807a5c8fcf6280a971700f84866
2014-03-31 23:57:41 +00:00
e4529c5724
Merge in the latest changes and fixes from trunk.
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FossilOrigin-Name: f6211540c9d66a08dc580dd733e4f4a98968ae30
2014-03-31 22:03:32 +00:00
d3c156638a
Remove an unnecessary conditional.
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FossilOrigin-Name: 7473c4dfc10a47594affa6f4e071a08dc8838c0c
2014-03-31 20:05:20 +00:00
3fb183d2f7
Also make sure an index that is a proper subset of some other index has a
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higher cost than that other index. Add test cases.
FossilOrigin-Name: b7830d232b073a197aa1092e78cb24e88cb10fd3
2014-03-31 19:49:00 +00:00
53cd10afcd
Make sure that an index that covers a proper superset of the WHERE clause
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terms of some other index has a lower cost than the other index.
FossilOrigin-Name: ea8b0910040198751551b0b960e6b783913607df
2014-03-31 18:24:18 +00:00
b663587890
Avoid a (harmless) buffer overread that is possible on an OOM when
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MEMSYS5 is engaged.
FossilOrigin-Name: b3296267fb67b9f59719a37093253062edde3746
2014-03-31 13:42:42 +00:00
7a4b1642a7
Experiments in picking better query plans, especially when the usage of one
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index is a subset of another.
FossilOrigin-Name: 8f869ca7a6eaa9ca7a08102290e6c606735f9090
2014-03-29 21:16:07 +00:00
36ed03428d
Fix a harmless compiler warning.
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FossilOrigin-Name: a4e47150f32b3a4120b1f89ccc66d633d829e3bb
2014-03-28 12:56:57 +00:00
a1f7c0a21c
Enhance the sqlite3VdbeRecordCompare() routines so that if they encounter
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database corruption, they will set the UnpackedRecord.isCorrupt field and
return 0. The sqlite3BtreeMovetoUnpacked() routine detects this and returns
SQLITE_CORRUPT, causing the corruption to be reported back to the top-level.
FossilOrigin-Name: 7fa85eaaaf6d211378620d728a759fdfe30a15b0
2014-03-28 03:12:48 +00:00
27de5c5cb6
Minor cleanup of the code in the query planner that computes the costs
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estimates for the various plans. There are no changes to the costs at this
time. But the code is slightly more readable now and that might facilitate
future enhancements.
FossilOrigin-Name: 9b4d7226bcee38be5ac68a54bee03b4179cb69fc
2014-03-27 18:36:34 +00:00
182ea4e324
Earlier detection of corruption in sqlite3VdbeRecordCompare() in order to
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avoid a potential buffer overread.
FossilOrigin-Name: 28ddecff044dbc2dff50a7d8406ab67dfe06587f
2014-03-26 14:51:07 +00:00
e2ac506704
Add an assert() and a comment to clarify the operation of the
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vdbeRecordCompareInt() routine.
FossilOrigin-Name: 851abdb8fd9b5a8a6ce21db53d30dbac3c430cc7
2014-03-26 12:02:38 +00:00
drh