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11 Commits

Author SHA1 Message Date
drh b1d607de25 Improvements and simplifications to the equality seek logic. Tests are 
adjusted so that they all pass now.

FossilOrigin-Name: 997ce6c90b454c03cc2ef6934752ee8dd2e520e3
 2015-11-05 22:30:54 +00:00
drh edb04ed946 Continue to support the (broken) legacy syntax of allowing strings for 
column names in CREATE INDEX statements and in UNIQUE and PRIMARY KEY
constraints.

FossilOrigin-Name: 3d3df79bfaf9dbc7aa711c08a19d2f6dbe744b32
 2015-09-04 12:54:01 +00:00
dan 3072b537f5 Do not assume that "col IS ?" matches at most a single row of a UNIQUE column unless the column is also NOT NULL. 
FossilOrigin-Name: e038ce8955e785afcc07bb22499955bbd22a7af4
 2015-05-15 19:59:23 +00:00
drh e8d0c61f0a A new implementation of indexing with the IS operator that works correctly 
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
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
danielk1977 284f4aca32 Fix compilation/testing with OMIT_SUBQUERY defined. Ticket #2828. (CVS 4603) 
FossilOrigin-Name: 0b34a18651764e650faba983be8593992ab2f4a9
 2007-12-10 05:03:46 +00:00
danielk1977 4152e677b8 Fixes for compilation/testing when the various OMIT macros are defined. (CVS 4423) 
FossilOrigin-Name: c8405b15c074c94dab5e33272cf1471f458d11df
 2007-09-12 17:01:45 +00:00
danielk1977 39984cdc8b Fix a vdbe stack leak that could occur where one side of a WHERE clause inequality evaluated to SQL null. (CVS 4045) 
FossilOrigin-Name: 17152bf1a268e130f0c43046bb438b617a747ff5
 2007-06-02 07:54:37 +00:00
drh 72e8fa42f9 Correctly handle NULLs in IN operators. Ticket #2273. 
The changes in where.c and in the WhereLevel.aInLoop structure are
not strictly necessary to fix this problem - they just make the code
easier to read.  Only the change in OP_Next/OP_Prev operator of vdbe.c
is required. (CVS 3735)

FossilOrigin-Name: 26348556d824c032851e409ac510cddb55c200bf
 2007-03-28 14:30:06 +00:00
drh f2d315d0c2 Fix an additional problem with the IS NULL optimization on LEFT JOINs. 
Ticket #2189.  See also ticket #2177. (CVS 3602)

FossilOrigin-Name: 358dd82d3a921228155e2cf9e22aedd2b651ca9c
 2007-01-25 16:56:06 +00:00
drh c49de5d98c Make sure the IS NULL optimization introduced by check-in (3494) correctly 
handles a LEFT JOIN where the a term from the right table of the join uses
an IS NULL constraint.  Ticket #2177.  This check-in also adds the new test
cases that were suppose to have been added with (3494) but which were
mistakenly omitted. (CVS 3595)

FossilOrigin-Name: 335863e4d16113fb9ecebce35d2db043771d98b1
 2007-01-19 01:06:01 +00:00