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Overview
| Comment: | Improve the omit-left-join optimization so that it works in some cases when the RHS is subject to a UNIQUE but not NOT NULL constraint. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: | 02ba8a7ba7ba71cd7abd5dd3093ea486 |
| User & Date: | drh 2018-01-31 16:50:27 |
References
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2018-09-08
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| 03:22 | • New ticket [9936b2fa] Infinite loop due to the ORDER BY LIMIT optimization. artifact: 9b89fdd3 user: drh | |
Context
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2018-01-31
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| 20:18 | When creating a new archive entry, have zipfile store UTC instead of local time in the legacy MS-DOS format timestamp field. check-in: b730d187 user: dan tags: trunk | |
| 19:13 | When creating a new archive entry, have zipfile store UTC instead of local time in the legacy MS-DOS format timestamp field. check-in: e2114df1 user: dan tags: zipfile-timestamp-fix | |
| 16:50 | Improve the omit-left-join optimization so that it works in some cases when the RHS is subject to a UNIQUE but not NOT NULL constraint. check-in: 02ba8a7b user: drh tags: trunk | |
| 14:07 | Fix a failing assert() in the new code on this branch. Closed-Leaf check-in: 74d857d1 user: dan tags: omit-left-join-fix | |
| 01:38 | Changes to the autoconf tarball so that it does not try to use system() when building on iOS. check-in: 32ed9c10 user: drh tags: trunk | |
Changes
Changes to src/where.c.
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}else if( eOp & (WO_EQ|WO_IS) ){
int iCol = pProbe->aiColumn[saved_nEq];
pNew->wsFlags |= WHERE_COLUMN_EQ;
assert( saved_nEq==pNew->u.btree.nEq );
if( iCol==XN_ROWID
|| (iCol>=0 && nInMul==0 && saved_nEq==pProbe->nKeyCol-1)
){
if( iCol>=0 && pProbe->uniqNotNull==0 ){
pNew->wsFlags |= WHERE_UNQ_WANTED;
}else{
pNew->wsFlags |= WHERE_ONEROW;
}
}
}else if( eOp & WO_ISNULL ){
pNew->wsFlags |= WHERE_COLUMN_NULL;
}else if( eOp & (WO_GT|WO_GE) ){
testcase( eOp & WO_GT );
testcase( eOp & WO_GE );
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}else if( eOp & (WO_EQ|WO_IS) ){
int iCol = pProbe->aiColumn[saved_nEq];
pNew->wsFlags |= WHERE_COLUMN_EQ;
assert( saved_nEq==pNew->u.btree.nEq );
if( iCol==XN_ROWID
|| (iCol>=0 && nInMul==0 && saved_nEq==pProbe->nKeyCol-1)
){
if( iCol==XN_ROWID || pProbe->uniqNotNull
|| (pProbe->nKeyCol==1 && pProbe->onError && eOp==WO_EQ)
){
pNew->wsFlags |= WHERE_ONEROW;
}else{
pNew->wsFlags |= WHERE_UNQ_WANTED;
}
}
}else if( eOp & WO_ISNULL ){
pNew->wsFlags |= WHERE_COLUMN_NULL;
}else if( eOp & (WO_GT|WO_GE) ){
testcase( eOp & WO_GT );
testcase( eOp & WO_GE );
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Changes to test/join2.test.
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SELECT DISTINCT v1, v3 FROM c1 LEFT JOIN c2 LEFT JOIN c3 ON (c3.k=v1+1);
} {2 v3 1112 {}}
do_execsql_test 4.1.4 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 LEFT JOIN c3 ON (c3.k=v1+1);
} {2 v3 2 v3 1112 {} 1112 {}}
do_eqp_test 4.2.1 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 ON (c2.k=v1) LEFT JOIN c3 ON (c3.k=v2);
} {
0 0 0 {SCAN TABLE c1}
0 1 1 {SEARCH TABLE c2 USING INTEGER PRIMARY KEY (rowid=?)}
0 2 2 {SEARCH TABLE c3 USING INTEGER PRIMARY KEY (rowid=?)}
}
do_eqp_test 4.2.2 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 ON (c2.k=v1) LEFT JOIN c3 ON (c3.k=v1+1);
} {
0 0 0 {SCAN TABLE c1}
0 1 2 {SEARCH TABLE c3 USING INTEGER PRIMARY KEY (rowid=?)}
}
# 2017-11-23 (Thanksgiving day)
# OSSFuzz found an assertion fault in the new LEFT JOIN eliminator code.
#
do_execsql_test 4.3.0 {
DROP TABLE IF EXISTS t1;
DROP TABLE IF EXISTS t2;
................................................................................
INSERT INTO t1(x) SELECT x FROM c;
INSERT INTO t2(x) SELECT x+9 FROM t1;
SELECT a.x, c.x
FROM t1 AS a
LEFT JOIN t1 AS b ON (a.x=b.x)
LEFT JOIN t2 AS c ON (a.x=c.x);
} {1 {} 2 {} 3 {} 4 {} 5 {} 6 {} 7 {} 8 {} 9 {} 10 10}
finish_test
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SELECT DISTINCT v1, v3 FROM c1 LEFT JOIN c2 LEFT JOIN c3 ON (c3.k=v1+1);
} {2 v3 1112 {}}
do_execsql_test 4.1.4 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 LEFT JOIN c3 ON (c3.k=v1+1);
} {2 v3 2 v3 1112 {} 1112 {}}
do_eqp_test 4.1.5 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 ON (c2.k=v1) LEFT JOIN c3 ON (c3.k=v2);
} {
0 0 0 {SCAN TABLE c1}
0 1 1 {SEARCH TABLE c2 USING INTEGER PRIMARY KEY (rowid=?)}
0 2 2 {SEARCH TABLE c3 USING INTEGER PRIMARY KEY (rowid=?)}
}
do_eqp_test 4.1.6 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 ON (c2.k=v1) LEFT JOIN c3 ON (c3.k=v1+1);
} {
0 0 0 {SCAN TABLE c1}
0 1 2 {SEARCH TABLE c3 USING INTEGER PRIMARY KEY (rowid=?)}
}
do_execsql_test 4.2.0 {
DROP TABLE c1;
DROP TABLE c2;
DROP TABLE c3;
CREATE TABLE c1(k UNIQUE, v1);
CREATE TABLE c2(k UNIQUE, v2);
CREATE TABLE c3(k UNIQUE, v3);
INSERT INTO c1 VALUES(1, 2);
INSERT INTO c2 VALUES(2, 3);
INSERT INTO c3 VALUES(3, 'v3');
INSERT INTO c1 VALUES(111, 1112);
INSERT INTO c2 VALUES(112, 1113);
INSERT INTO c3 VALUES(113, 'v1113');
}
do_execsql_test 4.2.1 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 ON (c2.k=v1) LEFT JOIN c3 ON (c3.k=v2);
} {2 v3 1112 {}}
do_execsql_test 4.2.2 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 ON (c2.k=v1) LEFT JOIN c3 ON (c3.k=v1+1);
} {2 v3 1112 {}}
do_execsql_test 4.2.3 {
SELECT DISTINCT v1, v3 FROM c1 LEFT JOIN c2 LEFT JOIN c3 ON (c3.k=v1+1);
} {2 v3 1112 {}}
do_execsql_test 4.2.4 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 LEFT JOIN c3 ON (c3.k=v1+1);
} {2 v3 2 v3 1112 {} 1112 {}}
do_eqp_test 4.2.5 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 ON (c2.k=v1) LEFT JOIN c3 ON (c3.k=v2);
} {
0 0 0 {SCAN TABLE c1}
0 1 1 {SEARCH TABLE c2 USING INDEX sqlite_autoindex_c2_1 (k=?)}
0 2 2 {SEARCH TABLE c3 USING INDEX sqlite_autoindex_c3_1 (k=?)}
}
do_eqp_test 4.2.6 {
SELECT v1, v3 FROM c1 LEFT JOIN c2 ON (c2.k=v1) LEFT JOIN c3 ON (c3.k=v1+1);
} {
0 0 0 {SCAN TABLE c1}
0 1 2 {SEARCH TABLE c3 USING INDEX sqlite_autoindex_c3_1 (k=?)}
}
# 2017-11-23 (Thanksgiving day)
# OSSFuzz found an assertion fault in the new LEFT JOIN eliminator code.
#
do_execsql_test 4.3.0 {
DROP TABLE IF EXISTS t1;
DROP TABLE IF EXISTS t2;
................................................................................
INSERT INTO t1(x) SELECT x FROM c;
INSERT INTO t2(x) SELECT x+9 FROM t1;
SELECT a.x, c.x
FROM t1 AS a
LEFT JOIN t1 AS b ON (a.x=b.x)
LEFT JOIN t2 AS c ON (a.x=c.x);
} {1 {} 2 {} 3 {} 4 {} 5 {} 6 {} 7 {} 8 {} 9 {} 10 10}
do_execsql_test 5.0 {
CREATE TABLE s1 (a INTEGER PRIMARY KEY);
CREATE TABLE s2 (a INTEGER PRIMARY KEY);
CREATE TABLE s3 (a INTEGER);
CREATE UNIQUE INDEX ndx on s3(a);
}
do_eqp_test 5.1 {
SELECT s1.a FROM s1 left join s2 using (a);
} {
0 0 0 {SCAN TABLE s1}
}
do_eqp_test 5.2 {
SELECT s1.a FROM s1 left join s3 using (a);
} {
0 0 0 {SCAN TABLE s1}
}
do_execsql_test 6.0 {
CREATE TABLE u1(a INTEGER PRIMARY KEY, b, c);
CREATE TABLE u2(a INTEGER PRIMARY KEY, b, c);
CREATE INDEX u1ab ON u1(b, c);
}
do_eqp_test 6.1 {
SELECT u2.* FROM u2 LEFT JOIN u1 ON( u1.a=u2.a AND u1.b=u2.b AND u1.c=u2.c );
} {
0 0 0 {SCAN TABLE u2}
}
finish_test
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