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f9944b5053632fd64457f87a49d500c8114082a1
Commit Graph

968 Commits

Author SHA1 Message Date
drh
f9944b5053 Prevent an automatic index from taking the place of a declared index. 
FossilOrigin-Name: 0a52bddd9db49b2b79fc24888b50023d0fe74f7b
 2014-06-18 15:11:54 +00:00
drh
dabe36d9dd Prevent an automatic index from taking the place of a declared index. 
FossilOrigin-Name: 4ece839d445ff578a449a339ab579a32e64c9d28
 2014-06-17 20:16:43 +00:00
drh
ef3ad02d90 Fix a missing space in a "wheretrace" comment. No changes to production code. 
FossilOrigin-Name: b500f2a09721b49c95a69c47a0205bc2375af2cd
 2014-06-17 17:00:42 +00:00
drh
9740726121 A different approach to the autoindex problem that deletes query-planner code 
rather than adding it.

FossilOrigin-Name: f270fb6e9e0b5e77f918081962008c6195ab1e36
 2014-06-17 12:33:55 +00:00
drh
9f808299ff Simplification to the logic that prevents automatic indexes from being formed 
on constant expressions.

FossilOrigin-Name: 36d67e1dd2b4f4c22d02f3c3b8d372074de5523a
 2014-06-17 09:52:26 +00:00
drh
6b7ff748a1 Allow an automatic index on a WHERE constraint where the RHS is does not 
reference another table as long as the RHS is not a constant.

FossilOrigin-Name: 58acc2a8b38c5f13175c191697b4d2b663db1872
 2014-06-17 09:00:54 +00:00
drh
9978e6a680 Do not attempt to create an automatic index on a constant constraint, as 
doing so is pointless.

FossilOrigin-Name: d6883e960f61365729f279a3c1f2c050beb49a55
 2014-06-17 02:46:55 +00:00
drh
0ace74a19c In the "wheretrace" logic (disabled for normal builds) expand the print width 
of the flags field to be wide enough for all 17 bits.

FossilOrigin-Name: 3181d2069a788adc719decf65dc1bd2e16650c87
 2014-06-16 21:30:29 +00:00
drh
696964d0e5 Simplify the estLog() routine. 
FossilOrigin-Name: 6c68d758bce3752f044752404a76bf3ba3eec48f
 2014-06-12 15:46:46 +00:00
drh
c94b2f7d6b Make sure the estLog() routine in the query planner handles negative 
values correctly (always returning 1).  Prior to this change, estLog(-1)
would return a large number which could throw off the cost computations
in the query planner in obscure circumstances.

FossilOrigin-Name: 75437bee4905949c66dc7694ea234d4d5aefd981
 2014-06-06 20:20:09 +00:00
drh
94aa7e091b Fix an obsolete comment on the whereRangeScanEst() routine. No 
changes to code.

FossilOrigin-Name: b16bf8518b7c50f6a939aa54900fea91b1098470
 2014-06-06 17:09:52 +00:00
drh
7f80c7146f Remove the WHERE_LIKELIHOOD bit, as it does not seem to effect any result. 
FossilOrigin-Name: 1cbe7a0883e081611a50524517d70e0b6c5199d2
 2014-06-02 21:00:34 +00:00
drh
2504c6c632 Fix the query planner so that it once again knows that queries without a 
FROM clause will never return more than one row and hence do not require
sorting.

FossilOrigin-Name: 9f18b303cd1bc5779d82669884f802c7889b4947
 2014-06-02 11:26:33 +00:00
drh
48dd1d8e28 Change the name of the Index.autoIndex field to Index.idxType and provide 
symbolic names for the various values of that field rather than using
magic numbers.

FossilOrigin-Name: d16e575dacc811de0f7b58a0d1cd243678dce6c5
 2014-05-27 18:18:58 +00:00
drh
a3bc66a3f5 Avoid unnecessary cursor opens and seeks when running the OR-optimization 
on a WITHOUT ROWID table.

FossilOrigin-Name: 9c785c58327e08dad94a278a643a5443f94aec36
 2014-05-27 17:57:32 +00:00
drh
3fb6730699 Improved comments on the OR-optimization logic in the query planner. 
FossilOrigin-Name: 77fef5a3987fc16f84a8e755283ca6ec1363013c
 2014-05-27 16:41:39 +00:00
drh
5609baf35e Minor enhancements to comments and clarification of the code. 
FossilOrigin-Name: cbec30d0c49a3f618c3df3ae0ca3d651b48841c2
 2014-05-26 22:01:00 +00:00
drh
68c121534c Add a missing VdbeCoverage() macro on an OP_Found opcode added in the previous 
check-in.

FossilOrigin-Name: b4980a07e287480beddb2c6633c733520e05d074
 2014-05-26 20:25:34 +00:00
dan
f97dad8849 Enable the OR optimization for WITHOUT ROWID tables. Use a temp table instead of the RowSet object to track the rows that have already been included in the result set. 
FossilOrigin-Name: 2c7e277bbebd5c93dec53d381d9737909d40d846
 2014-05-26 20:06:45 +00:00
dan
e96f2df3dd Changes to the output of EXPLAIN QUERY PLAN to make it clearer when a query uses the PRIMARY KEY index of a WITHOUT ROWID table. 
FossilOrigin-Name: 9268df305b90ac11e44b3107bbab5becf38860b7
 2014-05-23 17:17:06 +00:00
drh
9ee8810be2 Remove a superfluous variable initialization. 
FossilOrigin-Name: 68766f837491cb89c2103f2627eb9e23ab326a68
 2014-05-07 20:33:17 +00:00
drh
e724d3d26a Add a comment explaining why WhereLoop cost adjustments are omitted for 
skip-scan loops.

FossilOrigin-Name: 3bc43594aaeee9225c0590677fcce480bedcb37b
 2014-05-02 00:09:40 +00:00
drh
c5f246eb37 Add #ifdefs for test coverage. Add a testcase(). 
FossilOrigin-Name: be2702ce35c713b33c9b7689643b45fb0de6af2a
 2014-05-01 20:24:21 +00:00
dan
5da73e1a09 Fix a problem in calculating the costs of "OR" scans. 
FossilOrigin-Name: 9bbca48b42e4fe16f2188e18dc736da30a96435c
 2014-04-30 18:11:55 +00:00
dan
8164722c58 Add text to the header comment of whereLoopAddBtree() describing how the costs of various b-tree loops are estimated. 
FossilOrigin-Name: 05e6e16cb28c9ffb4596bd2ef81f687c5403ecbb
 2014-04-30 15:00:16 +00:00
dan
4a6b8a05cd Fix a couple of out-of-date comments in where.c. 
FossilOrigin-Name: eefeda32d54efbbdf7d20b719299eda48b891fae
 2014-04-30 14:47:01 +00:00
dan
e4618fb30d Merge trunk changes into this branch. 
FossilOrigin-Name: d74299f037f3a6a4b3bce8b4d1c76c407c1f3b3e
 2014-04-29 16:46:24 +00:00
dan
09e1df6c00 Ignore likelihood() values on indexed IPK lookups. 
FossilOrigin-Name: 5bb7757a7b32a74482d3e93e9c9eea02273fe981
 2014-04-29 16:10:22 +00:00
dan
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. 
FossilOrigin-Name: a8ae93f0cffa116df0ba34d46a53f49d42dace41
 2014-04-28 20:11:20 +00:00
dan
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. 
FossilOrigin-Name: 4047ac75e2a8f0b330255501c42e4f04e5ab500d
 2014-04-28 19:34:06 +00:00
dan
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. 
FossilOrigin-Name: 88a5758dcce891eb7be15432ebdc9f80071d413b
 2014-04-28 09:35:31 +00:00
dan
440e6ff3b0 Fix an error in estimating of the number of rows visited by a range scan. 
FossilOrigin-Name: d491de62fce69d93e89f65f7713972f7c2c451f7
 2014-04-28 08:49:54 +00:00
dan
2dd3cdcfab Fix an sqlite3_stmt_status() problem caused by recent changs on this branch. 
FossilOrigin-Name: dee204092421a239f9f60ab83c3a5b3e24d1baea
 2014-04-26 20:21:14 +00:00
dan
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. 
FossilOrigin-Name: c51efaa5d29ee0a91b9e6a83a8dd82530670811a
 2014-04-25 20:22:45 +00:00
dan
cfc9df76e1 Store values loaded from the stat1 table as logarithmic values in memory. 
FossilOrigin-Name: 1bd74c49ddab6f53bb6eaa57907eff44c2580dd6
 2014-04-25 15:01:01 +00:00
drh
9dfaf621d1 Make sure ORDER BY clauses on joins that involve virtual tables and that 
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
dan
aa9933c115 Changes to the way the planner calculates the costs of various table and index scans. Some test cases still failing. 
FossilOrigin-Name: c5a6ec0a880652dc8f4593d9f7acd58ddc3dc5f3
 2014-04-24 20:04:49 +00:00
dan
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]. 
FossilOrigin-Name: de9a490f594183f337a2ec9e0f87792eac83548b
 2014-04-21 13:21:56 +00:00
drh
b355c2cc12 Clean up the proper-subset cost adjustment logic to make it more compact 
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
drh
d249090450 Remove the unused second argument from sqlite3ExprCachePop(). Add an 
ALWAYS() on an always-true conditional in sqlite3VdbeResolveLabel().

FossilOrigin-Name: ab23abf392175d3e256ff619b13abbbe732a49ed
 2014-04-13 19:28:15 +00:00
drh
853546d047 Merge changes to the query planner that strive to ensure that any index 
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
drh
c438df1be0 Use OP_Copy instead of OP_SCopy when moving results out of a subquery, 
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
drh
d3c156638a Remove an unnecessary conditional. 
FossilOrigin-Name: 7473c4dfc10a47594affa6f4e071a08dc8838c0c
 2014-03-31 20:05:20 +00:00
drh
3fb183d2f7 Also make sure an index that is a proper subset of some other index has a 
higher cost than that other index.  Add test cases.

FossilOrigin-Name: b7830d232b073a197aa1092e78cb24e88cb10fd3
 2014-03-31 19:49:00 +00:00
drh
53cd10afcd Make sure that an index that covers a proper superset of the WHERE clause 
terms of some other index has a lower cost than the other index.

FossilOrigin-Name: ea8b0910040198751551b0b960e6b783913607df
 2014-03-31 18:24:18 +00:00
drh
7a4b1642a7 Experiments in picking better query plans, especially when the usage of one 
index is a subset of another.

FossilOrigin-Name: 8f869ca7a6eaa9ca7a08102290e6c606735f9090
 2014-03-29 21:16:07 +00:00
drh
36ed03428d Fix a harmless compiler warning. 
FossilOrigin-Name: a4e47150f32b3a4120b1f89ccc66d633d829e3bb
 2014-03-28 12:56:57 +00:00
drh
27de5c5cb6 Minor cleanup of the code in the query planner that computes the costs 
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
drh
59b8f2e108 Fix the ORDER BY optimization logic so that it will do a block-sort on 
a partial DESC ORDER BY.  This enhancement uncovered a memory leak in
pushUntoSorter() which is also fixed.

FossilOrigin-Name: c36f74611cf17ad2ff198a2ac2054d7ab451a72c
 2014-03-22 00:27:14 +00:00
drh
cc08fa48b8 Merge the OFFSET-on-query-without-FROM fix from trunk. 
FossilOrigin-Name: 71e9ae72c272dc86720b2bfe719f57de437c400b
 2014-03-21 18:45:19 +00:00