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22 Commits

Author SHA1 Message Date
drh
a9c18a9067 Test cases added. Comments fixed. Proposed solution for 
ticket [05f43be8fdda9fbd9].

FossilOrigin-Name: 6b993bd54035b67f4d84941e3f444ca79b7feee1
 2015-03-06 20:49:52 +00:00
drh
cfc6ca4179 Seek past NULLs in a top-constrained search. Avoid checking for NULLs in 
the body of the search.

FossilOrigin-Name: e07a32f30862acf3b322d4d8deb015846d6f8f5f
 2014-02-14 23:49:13 +00:00
drh
7c3280649a Make sure that virtual WHERE-clause terms do not get transformed into real 
terms when processing set of OR-connected terms.
Fix for ticket [4c86b126f22ad].

FossilOrigin-Name: c950d6c4117d076f871518e738cdf9e8c46a19fc
 2014-02-11 01:50:29 +00:00
drh
d4ddae985b Disable the OR optimization for WITHOUT ROWID tables, since it relies on 
the use of rowids.

FossilOrigin-Name: 6055dad2ba2f9256b1f2d0a9e32ca00f1b81b0cf
 2013-11-06 12:05:57 +00:00
drh
aa32e3c60a Enhance the query planner so that it looks at multiple solutions to OR 
expressions in the WHERE clause.

FossilOrigin-Name: 5e19d054105fb16ff52d265d48cc87a418603f6f
 2013-07-16 21:31:23 +00:00
drh
fd5874d23d Add the "queryplanner" test permutation. Continuing refinements to NGQP. 
FossilOrigin-Name: 25e2cde105a19293bdb9c001b48624e5d7f8c4e5
 2013-06-12 14:52:39 +00:00
dan
4c5aeecc90 Fix minor test script issues causing releasetest.tcl to fail. 
FossilOrigin-Name: d8ded9d8a1052885ce223c70efa55c0dd8b9920e
 2013-05-16 19:15:07 +00:00
drh
3c449c6b6b Make sure extra parentheses around subqueries in the FROM clause are harmless. 
Ticket [28c6e830f239ea5].

FossilOrigin-Name: 1c79569226db3d5a73e65a35877635ea8b478866
 2013-04-30 14:06:57 +00:00
drh
832ee3d4cc Optimize the degenerate case of a FROM clause table name enclosed all by 
itself inside parentheses.  Generate code as if the parentheses did not
exist, rather than the old behavior of manifesting the parenthesized table
into a transient table.  Also, tag every FROM-clause SELECT subquery that is
generated by a parenthesized FROM-clause expression using the SF_NestedFrom
flag.  The new SF_NestedFrom flag is not yet used for anything.

FossilOrigin-Name: 7fecced466d86a66b0b751c5b5608141e134fe2d
 2012-12-18 19:36:11 +00:00
drh
ed754ce2cc Further refinements to table order selection on join query planning. 
FossilOrigin-Name: defaf0d99a807027f8883bf821b6482025f9f54e
 2010-04-15 01:04:54 +00:00
drh
c01a3c1775 Ensure WHERE clause terms involving tables on the right end of a join 
are not prematurely evaluated when tables on the left end of the join
make use of the OR-clause optimization.  
Fix for ticket [31338dca7e].

FossilOrigin-Name: 2c2de252666662f5459904fc33a9f2956cbff23c
 2009-12-16 22:10:49 +00:00
drh
9f3962e7b5 Make sure a variable is cleared before use in the where8.test script. 
FossilOrigin-Name: b34365296d65310bb015901d18ed463e73d47cbe
 2009-12-02 02:49:49 +00:00
dan
5236ac1d04 Changes to the query planner that improve the order in which tables/indexes are scanned in join queries. 
FossilOrigin-Name: 19f799b32f9d1be25d4185ce18b13f4dd502e199
 2009-08-13 07:09:33 +00:00
danielk1977
f51d1bd665 Fix a bug in where.c that could cause SQLite to write to freed memory while compiling a query with many terms in the WHERE clause. (CVS 6952) 
FossilOrigin-Name: 8161af840e8fd2b06457e75023f934e1b8fe5fd6
 2009-07-31 06:14:51 +00:00
drh
c4ac22e905 Disable the LIKE optimization if the affinity of the LHS column is 
not TEXT.  Ticket #3901. (CVS 6727)

FossilOrigin-Name: a255c645c46ae03b65f862858fe57e462076e1fc
 2009-06-07 23:45:10 +00:00
drh
dda70fe38e Remove leftover "breakpoint" commands from test scripts. Also remove blank 
lines at the end of scripts. (CVS 6721)

FossilOrigin-Name: 1fef16ec2b89981770cf44f606a420fbe031a7a4
 2009-06-05 17:09:11 +00:00
danielk1977
1d46146b58 Attempt to optimize virtual table queries with 'OR' expressions in the WHERE clause. (CVS 6527) 
FossilOrigin-Name: f61e4cd93682fd98bea2a71d346f9eaa68454390
 2009-04-21 09:02:45 +00:00
danielk1977
13da67e5aa Add further pseudo-randomly generated test cases to where8.test. (CVS 6083) 
FossilOrigin-Name: e01f6ef9d981d50a70c05edc4ef8135dbc473ba1
 2008-12-30 16:13:04 +00:00
danielk1977
c1071e53e7 Fix a bug in where8.test causing a tcl exception. (CVS 6082) 
FossilOrigin-Name: 495b569a3921042c36667a415c1353201760fa17
 2008-12-30 15:51:40 +00:00
danielk1977
9357416a25 Add a few more tests to where8.test. (CVS 6081) 
FossilOrigin-Name: ac28aa8b618d59628c5b8fc6fe649ec14f554b11
 2008-12-30 15:26:29 +00:00
danielk1977
5f0ff5d527 Add a couple of extra tests for the "WHERE ... OR" optimization. (CVS 6077) 
FossilOrigin-Name: 35c87585b81866e73a58adffe6af79ddcac57cf6
 2008-12-30 12:00:12 +00:00
danielk1977
fdc4019b46 Add test file where8.test. (CVS 6072) 
FossilOrigin-Name: bff460ec2c3e250de034a6b34312b897bb2f3749
 2008-12-29 18:33:32 +00:00