a3f108e93d
Reduce the size of the WhereScan object by 24 bytes while also clarifying its
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operation.
FossilOrigin-Name: cbc3c9a8bf169ae0b21f26855038502c6cc25cfe
2015-08-26 21:08:04 +00:00
567cc1e407
Move sqlite3IndexColumnAffinity() inside of SQLITE_ENABLE_STAT3_OR_STAT4.
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FossilOrigin-Name: b3732a4e1b42a86675d89766cb8089914e2fab9a
2015-08-25 19:42:28 +00:00
e910769817
Use the sqlite3IndexColumnAffinity() routine to quickly and correctly find the
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affinity of an index column.
FossilOrigin-Name: 1ee089a72d789002a0a377347fc51e08ab32fb14
2015-08-25 19:20:04 +00:00
c1bd84124b
Merge recent enhancements from trunk, including table-valued expressions.
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FossilOrigin-Name: b9927c876c1d4e146cb6a603d82cd2489594084d
2015-08-20 23:45:59 +00:00
01d230ce05
A list of arguments following a table name translates into equality
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constraints against hidden columns in that table.
FossilOrigin-Name: 40e12cfe4c29475417ba89fb637b4c763cf74016
2015-08-19 17:11:37 +00:00
8a48b9c0b1
Minor refactor of the SrcList object so that it is able to hold the argument
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list to a table-valued-function in the FROM clause.
FossilOrigin-Name: b919376147597c4b73421abe5788f893baf1560b
2015-08-19 15:20:00 +00:00
2f2b02785a
Fix the cursor hint mechanism so that it does the right thing for indexed
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lookups.
FossilOrigin-Name: 581e3d4988e98975fea5daaeb9f854c54a4976b7
2015-08-14 18:50:04 +00:00
cf599b6ade
Enhance the query planner so that it is able to use partial indexes that use
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AND-connected terms in the WHERE clause.
FossilOrigin-Name: 065765902d2774d7432b9c00ea2efed26e0aaa5e
2015-08-07 20:57:00 +00:00
36b80349b7
Add the OP_ColumnsUsed opcode (when compiled with
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SQLITE_ENABLE_COLUMN_USED_MASK) as a hint to the b-tree layer as to which
columns of a btree cursor will be used.
FossilOrigin-Name: 711a176cbfad5dde6defa9648fba6d0d663af134
2015-06-12 12:54:15 +00:00
4430b40934
Remove some repeated lines of source code. Probably introduced by careless cut'n'pasting.
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FossilOrigin-Name: a34cd71c8aafaece04a2332a127e9b8e99c1403c
2015-06-09 10:58:51 +00:00
35175bf7ab
If a query contains "FROM t1 LEFT JOIN t2, t3, t4", ensure that tables t3 and t4 are not scanned before t2. The trunk already does this.
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FossilOrigin-Name: 0d9edfab9fb61322620f188b48ae2a1798a07581
2015-06-08 18:48:29 +00:00
4f20cd402b
Avoid passing constraints that are unusable due to LEFT or CROSS joins to virtual table xBestIndex() methods.
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FossilOrigin-Name: 80ee56dda7db3860f8be5f6968c8745138f8453f
2015-06-08 18:05:54 +00:00
6c1f4ef217
Split more subfunctions of where.c out into a new whereexpr.c source file,
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for improved maintainability.
FossilOrigin-Name: 46ef95c108ad8961f2bf3d2dc839d4fb1fddd770
2015-06-08 14:23:15 +00:00
6f82e85a80
Split out the bulk of the actual VDBE code generation logic from where.c
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into a new file, leaving behind the analysis logic. This makes the original
where.c smaller and hopefully easier to edit.
FossilOrigin-Name: faa0e420e93a2bc1c84df9eb9fef4748d29ce339
2015-06-06 20:12:09 +00:00
b121dd14ac
Code simplifications in select.c and where.c.
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FossilOrigin-Name: 4f20ac90bce8bd7ba43ef59af5cc4ef7aa282fe8
2015-06-06 18:30:17 +00:00
97bae794c2
Add a new opcode to the VDBE that gives the b-tree a hint about the set
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of columns in a table or index that are actually used by the query.
FossilOrigin-Name: f167bba446b78dd7538d0b2bae3e6678f3b1ba28
2015-06-05 15:59:57 +00:00
d62fbb50e6
Change the name of SrcList.a[].zIndex to the more descriptive
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SrcList.a[0].zIndexedBy.
FossilOrigin-Name: 6a9cf063379118dbb95c6cdc6d60af50e9867177
2015-06-04 12:08:53 +00:00
05883a3409
Rename SQLITE_AFF_NONE to SQLITE_AFF_BLOB.
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FossilOrigin-Name: bce3f04186cd2d69414a5a98b5b77dc8f060554a
2015-06-02 15:32:08 +00:00
d092ed4355
Add some extra source-code comments and a test case.
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FossilOrigin-Name: 6d410442fb532e2cf0ad1859bc9e843651f8ff4d
2015-05-29 14:36:30 +00:00
7b3aa08e22
An attempt to allow automatic index creation on subqueries accessed via
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co-routine.
FossilOrigin-Name: 521345add67e9dfd7df1446eb942aa0d84b9e6eb
2015-05-29 13:55:33 +00:00
c4d56dd74b
Use an ALWAY() on conditionals in the transitive constraint logic that are
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always true as far as we know.
FossilOrigin-Name: 204e567f68e4b3e069f04ca0643c6e5db781d39f
2015-05-18 12:18:37 +00:00
69c15fee98
Refinements to the determination of when an A==B term is an equivalence.
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Add test cases.
FossilOrigin-Name: 6bfaf525cac2e0c0a4a3bd3a1fc7bf5bd3234303
2015-05-18 11:34:52 +00:00
5820118da5
Further restrictions on the use of the transitive property in WHERE clauses.
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FossilOrigin-Name: 8c886c43ff0bd5953d289534791d2c6b9dc25445
2015-05-16 20:51:25 +00:00
ea19cc10f5
Fix the transitive constraint processing to only allow transitivity if the
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operands of the == or IS operator have compatible affinities.
FossilOrigin-Name: a46a247fbcfe6e63b12cef31353835295a650c9b
2015-05-16 19:17:17 +00:00
e655a0e34e
Fix a typo in a comment. No changes to code.
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FossilOrigin-Name: ee4b74250ad7a4061421d44b490cb79f649b3720
2015-05-16 18:31:44 +00:00
4e5bef8c00
Minor coding style change, adjust new local variable casing for consistency.
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FossilOrigin-Name: 1a4628c66c632d2aff02bf134ddf7adceb04fb84
2015-05-15 20:14:00 +00:00
3072b537f5
Do not assume that "col IS ?" matches at most a single row of a UNIQUE column unless the column is also NOT NULL.
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FossilOrigin-Name: e038ce8955e785afcc07bb22499955bbd22a7af4
2015-05-15 19:59:23 +00:00
4a00b33c02
More test cases. Remove some invalid testcase() macros. Rearrange some code
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for improved testability.
FossilOrigin-Name: b3676377b257bd8bb7fefe9c365d76cdc9e44856
2015-05-14 13:41:22 +00:00
ee14587c39
Add testcase() macros. Get transitive WHERE clause constraints on IS operators
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working again.
FossilOrigin-Name: d195d4a65d7184e34a2a08c3ac3db7f6c8c1c21c
2015-05-14 13:18:47 +00:00
e8d0c61f0a
A new implementation of indexing with the IS operator that works correctly
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when the IS operator is in the WHERE clause and the operands are from
opposite sides of a LEFT JOIN.
FossilOrigin-Name: 4541688b3f56f5cd3d5b299594b58c577ad633bb
2015-05-14 01:05:25 +00:00
9be1870994
Simplified implementation of indexing with the IS operator.
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FossilOrigin-Name: 95b1f9bf14e490c6c6bba9ea78aeab712a44aab5
2015-05-13 19:33:41 +00:00
e0cc3c296c
Add testcase() macros and comments and a few test-cases.
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FossilOrigin-Name: 24263d08b11c88416d270013bdaf5ff45125cb4d
2015-05-13 17:54:08 +00:00
fcd49531c9
An early attempt to get indexes to work with the IS operator. This code
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passes tests, but much more testing is needed to verify that it works on
all corner cases.
FossilOrigin-Name: 6f7f1673d00d216a5aa456acb44793a14f3b3d91
2015-05-13 15:24:07 +00:00
c049057242
Cleanup of the sqlite3StrAccumInit() function. No functionality changes.
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FossilOrigin-Name: 7952c32268aa650d9ee946d5bfe190f712e3bbe6
2015-05-02 11:45:53 +00:00
f89aa47f80
Fix an obscure memory leak that could follow an OOM in where.c.
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FossilOrigin-Name: 08ec9f2f5a446774bb8e9b9b0ef463dd5458d28e
2015-04-25 12:20:24 +00:00
0f517ea8d4
Make sure the whereSplit() routine in the query planner is not confused
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by the likely() operator.
FossilOrigin-Name: 588db14ffb4b0e8e76d511b7b1541db3ec78836a
2015-04-21 02:12:13 +00:00
19b887e4ec
Fix another harmless compiler warning.
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FossilOrigin-Name: 5ae853aaebaee76c9265061984185f74c10c4c8b
2015-04-19 23:48:10 +00:00
29031837c1
Remove an incorrect ALWAYS() from the automatic index generator.
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FossilOrigin-Name: eeb4bd06bf69e411736cc6077d1d64af6bd8fb09
2015-04-15 07:34:25 +00:00
65df68e8c5
Correctly deal with an unknown collating sequence on an indexed DISTINCT query.
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FossilOrigin-Name: a0b6e2fed3e95cf78ed0515c6e4da7510af4e86a
2015-04-15 05:31:02 +00:00
11b0481778
Avoid problems when a query has a GROUP BY and an ORDER BY but no FROM clause.
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FossilOrigin-Name: e527d96a1e098ade4e9d124b630a8c2ea2ac9b36
2015-04-12 01:22:04 +00:00
2813bde028
Do not assume an index contains unique entries unless it is declared UNIQUE and NOT NULL is specified for all columns. Fix for [7b4fee9f6c].
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FossilOrigin-Name: e3b1f625518edc0e925116668dca5d25c3232b59
2015-04-11 11:44:27 +00:00
e0997b341b
Provide the BTREE_SEEK_EQ hint to the b-tree layer.
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FossilOrigin-Name: e750830f1e61160c0c67e35b13e50b35a95b50e1
2015-03-20 14:57:50 +00:00
80103fc614
Fix a problem causing collation sequence names to be dequoted multiple times under some circumstances.
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FossilOrigin-Name: eddc05e7bb31fae74daa86e0504a3478b99fa0f2
2015-03-20 08:43:59 +00:00
f104abba84
Make SQLite slightly more likely to use an auto-index within a sub-query.
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FossilOrigin-Name: ab832336f4a28193c4d2b61e833564822a7b86a8
2015-03-16 20:40:00 +00:00
29894b6d2b
When the WHERE clause contains two OR-connected terms with identical
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operands but different operators, try to combine them into a single term.
Example: (X=A OR X>A) becomes (X>=A).
FossilOrigin-Name: 8bdda827a3d268009297a0216e3d94bf0eceeb2e
2015-03-16 17:48:12 +00:00
c03acf2ea7
Improved comments. No code changes.
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FossilOrigin-Name: 23f71a26386ff2aff9800fe96cec1dc9c805b5b6
2015-03-16 13:12:34 +00:00
8426636cdc
When a WHERE clause contains disjuncts with the same operands, try to
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combine them into a single operator. Example: (x=A OR x>A) becomes
(x>=A).
FossilOrigin-Name: 7a3097689d17625fb0dfc4372712f375f3bdb9a1
2015-03-16 12:13:31 +00:00
a3d0c13654
When estimating the number of rows visited by a range scan for which the keys consist of more than one field, consider prefixes of stat4 samples as well as the full samples.
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FossilOrigin-Name: e1caf93c9ad0ee15d42030af95619f212d3fcf9d
2015-03-14 18:59:58 +00:00
8031462939
Fix the LIKE optimization so that it works even if there are additional
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range contraints on the column that is subject to the LIKE or GLOB.
FossilOrigin-Name: 984c3fd5261619fb542a5a95dab37707b5d79dbf
2015-03-09 13:01:02 +00:00
a40da62dd4
Always use LIKE optimization range constraints in pairs.
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FossilOrigin-Name: 0e02dc94fd1bb891d0edd1e34b57e923b17712a7
2015-03-09 12:11:56 +00:00
drh