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Overview
| Comment: | The sqlite3ExprCodeGetColumn() is not guaranteed to put the result in the register requested. Fix the skip-scan code generator for WITHOUT ROWID tables so that it always checks the register and copies the result if it lands in the wrong register. Fix for ticket [8fd39115d8f46ece70e7d4b3]. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 793e206f9032d9205bdb3f447b136bed |
| User & Date: | drh 2015-07-23 16:39:33 |
Context
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2015-07-23
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| 17:16 | When SQLITE_OMIT_LOOKASIDE is set, do not allocate any lookaside memory since it will never be used. check-in: 0ffd499f user: drh tags: trunk | |
| 16:39 | The sqlite3ExprCodeGetColumn() is not guaranteed to put the result in the register requested. Fix the skip-scan code generator for WITHOUT ROWID tables so that it always checks the register and copies the result if it lands in the wrong register. Fix for ticket [8fd39115d8f46ece70e7d4b3]. check-in: 793e206f user: drh tags: trunk | |
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2015-07-21
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| 19:22 | Fix harmless compiler warning in MSVC 2015. check-in: 01c8b9cc user: mistachkin tags: trunk | |
Changes
Changes to src/wherecode.c.
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int nPk = pPk->nKeyCol;
int iPk;
/* Read the PK into an array of temp registers. */
r = sqlite3GetTempRange(pParse, nPk);
for(iPk=0; iPk<nPk; iPk++){
int iCol = pPk->aiColumn[iPk];
sqlite3ExprCodeGetColumn(pParse, pTab, iCol, iCur, r+iPk, 0);
}
/* Check if the temp table already contains this key. If so,
** the row has already been included in the result set and
** can be ignored (by jumping past the Gosub below). Otherwise,
** insert the key into the temp table and proceed with processing
** the row.
|
> | > > > |
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int nPk = pPk->nKeyCol;
int iPk;
/* Read the PK into an array of temp registers. */
r = sqlite3GetTempRange(pParse, nPk);
for(iPk=0; iPk<nPk; iPk++){
int iCol = pPk->aiColumn[iPk];
int rx;
rx = sqlite3ExprCodeGetColumn(pParse, pTab, iCol, iCur,r+iPk,0);
if( rx!=r+iPk ){
sqlite3VdbeAddOp2(v, OP_SCopy, rx, r+iPk);
}
}
/* Check if the temp table already contains this key. If so,
** the row has already been included in the result set and
** can be ignored (by jumping past the Gosub below). Otherwise,
** insert the key into the temp table and proceed with processing
** the row.
|
Changes to test/skipscan1.test.
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EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
} {~/ANY/}
do_execsql_test skipscan1-7.3 {
UPDATE sqlite_stat1 SET stat='500000 125000 1 sz=100 noskipscan';
ANALYZE sqlite_master;
EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
} {~/ANY/}
finish_test
|
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
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EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
} {~/ANY/}
do_execsql_test skipscan1-7.3 {
UPDATE sqlite_stat1 SET stat='500000 125000 1 sz=100 noskipscan';
ANALYZE sqlite_master;
EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
} {~/ANY/}
# Ticket 8fd39115d8f46ece70e7d4b3c481d1bd86194746 2015-07-23
# Incorrect code generated for a skipscan within an OR optimization
# on a WITHOUT ROWID table.
#
do_execsql_test skipscan1-8.1 {
DROP TABLE IF EXISTS t1;
CREATE TABLE t1(x, y, PRIMARY KEY(x,y)) WITHOUT ROWID;
INSERT INTO t1(x,y) VALUES(1,'AB');
INSERT INTO t1(x,y) VALUES(2,'CD');
ANALYZE;
DROP TABLE IF EXISTS sqlite_stat4;
DELETE FROM sqlite_stat1;
INSERT INTO sqlite_stat1(tbl,idx,stat) VALUES('t1','t1','1000000 100 1');
ANALYZE sqlite_master;
SELECT * FROM t1
WHERE (y = 'AB' AND x <= 4)
OR (y = 'EF' AND x = 5);
} {1 AB}
do_execsql_test skipscan1-8.1eqp {
EXPLAIN QUERY PLAN
SELECT * FROM t1
WHERE (y = 'AB' AND x <= 4)
OR (y = 'EF' AND x = 5);
} {/ANY/}
do_execsql_test skipscan1-8.2 {
SELECT * FROM t1
WHERE y = 'AB' OR (y = 'CD' AND x = 2)
ORDER BY +x;
} {1 AB 2 CD}
finish_test
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