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Overview
| Comment: | Make sure the WhereLoop.aLTerm[] array is large enough when processing the skip-scan optimization. Fix for ticket [520070ec7fbaac]. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
46d040591f27be01b1860344f8a26879 |
| User & Date: | drh 2013-12-22 20:44:10 |
Context
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2013-12-23
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| 15:35 | Make sure the WhereLoop.aLTerm[] array is large enough when processing the skip-scan optimization. Fix for ticket [520070ec7fbaac]. (check-in: ac5852d6 user: drh tags: branch-3.8.2) | |
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2013-12-22
| ||
| 22:45 | Remove a condition that is always in the logic that handles reading default values for columns. (check-in: 895af097 user: drh tags: trunk) | |
| 20:44 | Make sure the WhereLoop.aLTerm[] array is large enough when processing the skip-scan optimization. Fix for ticket [520070ec7fbaac]. (check-in: 46d04059 user: drh tags: trunk) | |
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2013-12-21
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| 17:14 | Fix speedtest1.c so that in --explain mode it only outputs non-explain text for DDL statements. (check-in: 2d2b3c49 user: drh tags: trunk) | |
Changes
Changes to src/where.c.
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** number 18 was found by experimentation to be the payoff point where
** skip-scan become faster than a full-scan.
*/
if( pTerm==0
&& saved_nEq==saved_nSkip
&& saved_nEq+1<pProbe->nKeyCol
&& pProbe->aiRowEst[saved_nEq+1]>=18 /* TUNING: Minimum for skip-scan */
){
LogEst nIter;
pNew->u.btree.nEq++;
pNew->u.btree.nSkip++;
pNew->aLTerm[pNew->nLTerm++] = 0;
pNew->wsFlags |= WHERE_SKIPSCAN;
nIter = sqlite3LogEst(pProbe->aiRowEst[0]/pProbe->aiRowEst[saved_nEq+1]);
|
> |
3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 |
** number 18 was found by experimentation to be the payoff point where
** skip-scan become faster than a full-scan.
*/
if( pTerm==0
&& saved_nEq==saved_nSkip
&& saved_nEq+1<pProbe->nKeyCol
&& pProbe->aiRowEst[saved_nEq+1]>=18 /* TUNING: Minimum for skip-scan */
&& (rc = whereLoopResize(db, pNew, pNew->nLTerm+1))==SQLITE_OK
){
LogEst nIter;
pNew->u.btree.nEq++;
pNew->u.btree.nSkip++;
pNew->aLTerm[pNew->nLTerm++] = 0;
pNew->wsFlags |= WHERE_SKIPSCAN;
nIter = sqlite3LogEst(pProbe->aiRowEst[0]/pProbe->aiRowEst[saved_nEq+1]);
|
Changes to test/skipscan1.test.
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EXPLAIN QUERY PLAN
SELECT a,b,c,d,'|' FROM t3 WHERE b=345 ORDER BY a;
} {/* INDEX sqlite_autoindex_t3_1 (ANY(a) AND b=?)*/}
do_execsql_test skipscan1-3.2sort {
EXPLAIN QUERY PLAN
SELECT a,b,c,d,'|' FROM t3 WHERE b=345 ORDER BY a;
} {~/*ORDER BY*/}
finish_test
|
> > > > > > > > > > > > > > > > > > > > > > |
182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 |
EXPLAIN QUERY PLAN
SELECT a,b,c,d,'|' FROM t3 WHERE b=345 ORDER BY a;
} {/* INDEX sqlite_autoindex_t3_1 (ANY(a) AND b=?)*/}
do_execsql_test skipscan1-3.2sort {
EXPLAIN QUERY PLAN
SELECT a,b,c,d,'|' FROM t3 WHERE b=345 ORDER BY a;
} {~/*ORDER BY*/}
# Ticket 520070ec7fbaac: Array overrun in the skip-scan optimization
# 2013-12-22
#
do_execsql_test skipscan1-4.1 {
CREATE TABLE t4(a,b,c,d,e,f,g,h,i);
CREATE INDEX t4all ON t4(a,b,c,d,e,f,g,h);
INSERT INTO t4 VALUES(1,2,3,4,5,6,7,8,9);
ANALYZE;
DELETE FROM sqlite_stat1;
INSERT INTO sqlite_stat1
VALUES('t4','t4all','655360 163840 40960 10240 2560 640 160 40 10');
ANALYZE sqlite_master;
SELECT i FROM t4 WHERE a=1;
SELECT i FROM t4 WHERE b=2;
SELECT i FROM t4 WHERE c=3;
SELECT i FROM t4 WHERE d=4;
SELECT i FROM t4 WHERE e=5;
SELECT i FROM t4 WHERE f=6;
SELECT i FROM t4 WHERE g=7;
SELECT i FROM t4 WHERE h=8;
} {9 9 9 9 9 9 9 9}
finish_test
|