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Overview
| Comment: | Previous check-in is not quite correct. "x IN (?)" is not exactly the same as "x==?" do to collation and affinity issues. The correct converstion should be to "x==(+? COLLATE binary)". The current check-in fixes this problem and provides test cases. Ticket [e39d032577df69] |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
2ff3b25f40fd117c8a2da1d1a3625f6b |
| User & Date: | drh 2014-03-20 14:56:47 |
References
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2014-03-20
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| 17:03 | The "x IN (?)" optimization in check-ins [2ff3b25f40] and [e68b427afb] is incorrect, as demonstrated by the in4-5.1 test case in this check-in. The "COLLATE binary" that was being added to the RHS of IN was overriding the implicit collating sequence of the LHS. This change defines the EP_Generic expression node property that blocks all affinity or collating sequence information in the expression subtree and adds that property to the expression taken from RHS of the IN operator. check-in: 2ea4a9f75f user: drh tags: trunk | |
Context
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2014-03-20
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| 15:14 | Fix harmless compiler warnings. check-in: b1435f26b0 user: drh tags: trunk | |
| 14:56 | Previous check-in is not quite correct. "x IN (?)" is not exactly the same as "x==?" do to collation and affinity issues. The correct converstion should be to "x==(+? COLLATE binary)". The current check-in fixes this problem and provides test cases. Ticket [e39d032577df69] check-in: 2ff3b25f40 user: drh tags: trunk | |
| 13:26 | Convert expressions of the form "X IN (?)" with exactly one value on the RHS of the IN into equality tests: "X=?". Add test cases to verify that statements work correctly on this corner case. Fix for ticket [e39d032577df6942]. check-in: e68b427afb user: drh tags: trunk | |
Changes
Changes to src/parse.y.
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/* Expressions of the form:
**
** expr1 IN (?1)
** expr1 NOT IN (?2)
**
** with exactly one value on the RHS can be simplified to:
**
** expr1 == ?1
** expr1 <> ?2
*/
Expr *pRHS = Y->a[0].pExpr;
Y->a[0].pExpr = 0;
sqlite3ExprListDelete(pParse->db, Y);
A.pExpr = sqlite3PExpr(pParse, N ? TK_NE : TK_EQ, X.pExpr, pRHS, 0);
}else{
A.pExpr = sqlite3PExpr(pParse, TK_IN, X.pExpr, 0, 0);
if( A.pExpr ){
A.pExpr->x.pList = Y;
sqlite3ExprSetHeight(pParse, A.pExpr);
}else{
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| | | > > |
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/* Expressions of the form:
**
** expr1 IN (?1)
** expr1 NOT IN (?2)
**
** with exactly one value on the RHS can be simplified to:
**
** expr1 == (+?1 COLLATE binary)
** expr1 <> (+?2 COLLATE binary)
*/
static const Token collBin = { "binary", 6 };
Expr *pRHS = sqlite3ExprAddCollateToken(pParse, Y->a[0].pExpr, &collBin);
Y->a[0].pExpr = 0;
sqlite3ExprListDelete(pParse->db, Y);
pRHS = sqlite3PExpr(pParse, TK_UPLUS, pRHS, 0, 0);
A.pExpr = sqlite3PExpr(pParse, N ? TK_NE : TK_EQ, X.pExpr, pRHS, 0);
}else{
A.pExpr = sqlite3PExpr(pParse, TK_IN, X.pExpr, 0, 0);
if( A.pExpr ){
A.pExpr->x.pList = Y;
sqlite3ExprSetHeight(pParse, A.pExpr);
}else{
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Changes to test/in4.test.
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do_execsql_test in4-3.47 {
SELECT * FROM t3 WHERE x NOT IN (10);
} {1 1 1}
do_execsql_test in4-3.48 {
EXPLAIN
SELECT * FROM t3 WHERE x NOT IN (10);
} {~/OpenEphemeral/}
finish_test
|
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do_execsql_test in4-3.47 {
SELECT * FROM t3 WHERE x NOT IN (10);
} {1 1 1}
do_execsql_test in4-3.48 {
EXPLAIN
SELECT * FROM t3 WHERE x NOT IN (10);
} {~/OpenEphemeral/}
# Make sure that when "x IN (?)" is converted into "x==?" that collating
# sequence and affinity computations do not get messed up.
#
do_execsql_test in4-4.1 {
CREATE TABLE t4a(a TEXT, b TEXT COLLATE nocase, c);
INSERT INTO t4a VALUES('ABC','abc',1);
INSERT INTO t4a VALUES('def','xyz',2);
INSERT INTO t4a VALUES('ghi','ghi',3);
SELECT c FROM t4a WHERE a=b ORDER BY c;
} {3}
do_execsql_test in4-4.2 {
SELECT c FROM t4a WHERE b=a ORDER BY c;
} {1 3}
do_execsql_test in4-4.3 {
SELECT c FROM t4a WHERE (a||'')=b ORDER BY c;
} {1 3}
do_execsql_test in4-4.4 {
SELECT c FROM t4a WHERE (a||'')=(b||'') ORDER BY c;
} {3}
do_execsql_test in4-4.5 {
SELECT c FROM t4a WHERE a IN (b) ORDER BY c;
} {3}
do_execsql_test in4-4.6 {
SELECT c FROM t4a WHERE (a||'') IN (b) ORDER BY c;
} {3}
do_execsql_test in4-4.11 {
CREATE TABLE t4b(a TEXT, b NUMERIC, c);
INSERT INTO t4b VALUES('1.0',1,4);
SELECT c FROM t4b WHERE a=b;
} {4}
do_execsql_test in4-4.12 {
SELECT c FROM t4b WHERE b=a;
} {4}
do_execsql_test in4-4.13 {
SELECT c FROM t4b WHERE +a=b;
} {4}
do_execsql_test in4-4.14 {
SELECT c FROM t4b WHERE a=+b;
} {}
do_execsql_test in4-4.15 {
SELECT c FROM t4b WHERE +b=a;
} {}
do_execsql_test in4-4.16 {
SELECT c FROM t4b WHERE b=+a;
} {4}
do_execsql_test in4-4.17 {
SELECT c FROM t4b WHERE a IN (b);
} {}
do_execsql_test in4-4.18 {
SELECT c FROM t4b WHERE b IN (a);
} {4}
do_execsql_test in4-4.19 {
SELECT c FROM t4b WHERE +b IN (a);
} {}
finish_test
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