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Overview
| Comment: | Omit unnecessary OP_Next and OP_Prev operators when uniqueness constraints guarantee that the code will only make one pass through the loop. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | f000c9b2b7348238fe2085140d2dd052 |
| User & Date: | drh 2011-03-09 21:02:31 |
References
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2011-03-09
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| 22:09 | Backport the OP_Next and OP_Prev for UNIQUE indices patch from checkin [f000c9b2b7] on the trunk. check-in: 2d55234e user: drh tags: branch-3.7.2 | |
Context
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2011-03-09
| ||
| 21:36 | Fix issue with mem5 allocator when min request size is larger thatn 2^30. check-in: d7dae06f user: shaneh tags: trunk | |
| 21:02 | Omit unnecessary OP_Next and OP_Prev operators when uniqueness constraints guarantee that the code will only make one pass through the loop. check-in: f000c9b2 user: drh tags: trunk | |
| 11:04 | Updates to the OS/2 implementation from Rich Walsh. check-in: dc46156a user: drh tags: trunk | |
Changes
Changes to src/where.c.
3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 |
sqlite3ExprCacheStore(pParse, iCur, -1, iRowidReg);
sqlite3VdbeAddOp2(v, OP_Seek, iCur, iRowidReg); /* Deferred seek */
}
/* Record the instruction used to terminate the loop. Disable
** WHERE clause terms made redundant by the index range scan.
*/
pLevel->op = bRev ? OP_Prev : OP_Next;
pLevel->p1 = iIdxCur;
}else
#ifndef SQLITE_OMIT_OR_OPTIMIZATION
if( pLevel->plan.wsFlags & WHERE_MULTI_OR ){
/* Case 4: Two or more separately indexed terms connected by OR
**
|
> | > > > > > |
3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 |
sqlite3ExprCacheStore(pParse, iCur, -1, iRowidReg);
sqlite3VdbeAddOp2(v, OP_Seek, iCur, iRowidReg); /* Deferred seek */
}
/* Record the instruction used to terminate the loop. Disable
** WHERE clause terms made redundant by the index range scan.
*/
if( pLevel->plan.wsFlags & WHERE_UNIQUE ){
pLevel->op = OP_Noop;
}else if( bRev ){
pLevel->op = OP_Prev;
}else{
pLevel->op = OP_Next;
}
pLevel->p1 = iIdxCur;
}else
#ifndef SQLITE_OMIT_OR_OPTIMIZATION
if( pLevel->plan.wsFlags & WHERE_MULTI_OR ){
/* Case 4: Two or more separately indexed terms connected by OR
**
|
Changes to test/index.test.
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 |
);
}
for {set i 1} {$i<=50} {incr i} {
execsql "INSERT INTO t3 VALUES('x${i}x',$i,0.$i)"
}
set sqlite_search_count 0
concat [execsql {SELECT c FROM t3 WHERE b==10}] $sqlite_search_count
} {0.1 3}
integrity_check index-11.2
# Numeric strings should compare as if they were numbers. So even if the
# strings are not character-by-character the same, if they represent the
# same number they should compare equal to one another. Verify that this
# is true in indices.
|
| |
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 |
);
}
for {set i 1} {$i<=50} {incr i} {
execsql "INSERT INTO t3 VALUES('x${i}x',$i,0.$i)"
}
set sqlite_search_count 0
concat [execsql {SELECT c FROM t3 WHERE b==10}] $sqlite_search_count
} {0.1 2}
integrity_check index-11.2
# Numeric strings should compare as if they were numbers. So even if the
# strings are not character-by-character the same, if they represent the
# same number they should compare equal to one another. Verify that this
# is true in indices.
|