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Overview
| Comment: | Always use available indices to optimize LIKE operators even if the pattern of the LIKE operator has a COLLATE modifier. This fixes an ineffiency that was introduced into 3.7.15 by check-in [8542e6180d4] on 2012-12-08. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
16bd54783a3f5531c55564ddefdada65 |
| User & Date: | drh 2014-01-16 15:31:41 |
Context
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2014-01-17
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| 15:15 | Add support for common table expressions (WITH clauses). check-in: 0171e3bb user: dan tags: trunk | |
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2014-01-16
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| 15:31 | Always use available indices to optimize LIKE operators even if the pattern of the LIKE operator has a COLLATE modifier. This fixes an ineffiency that was introduced into 3.7.15 by check-in [8542e6180d4] on 2012-12-08. check-in: 16bd5478 user: drh tags: trunk | |
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2014-01-14
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| 10:17 | Fix harmless compiler warning in LEMON. check-in: f61a7058 user: mistachkin tags: trunk | |
Changes
Changes to src/where.c.
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){
/* IMP: R-02065-49465 The left-hand side of the LIKE or GLOB operator must
** be the name of an indexed column with TEXT affinity. */
return 0;
}
assert( pLeft->iColumn!=(-1) ); /* Because IPK never has AFF_TEXT */
pRight = pList->a[0].pExpr;
op = pRight->op;
if( op==TK_VARIABLE ){
Vdbe *pReprepare = pParse->pReprepare;
int iCol = pRight->iColumn;
pVal = sqlite3VdbeGetBoundValue(pReprepare, iCol, SQLITE_AFF_NONE);
if( pVal && sqlite3_value_type(pVal)==SQLITE_TEXT ){
z = (char *)sqlite3_value_text(pVal);
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){
/* IMP: R-02065-49465 The left-hand side of the LIKE or GLOB operator must
** be the name of an indexed column with TEXT affinity. */
return 0;
}
assert( pLeft->iColumn!=(-1) ); /* Because IPK never has AFF_TEXT */
pRight = sqlite3ExprSkipCollate(pList->a[0].pExpr);
op = pRight->op;
if( op==TK_VARIABLE ){
Vdbe *pReprepare = pParse->pReprepare;
int iCol = pRight->iColumn;
pVal = sqlite3VdbeGetBoundValue(pReprepare, iCol, SQLITE_AFF_NONE);
if( pVal && sqlite3_value_type(pVal)==SQLITE_TEXT ){
z = (char *)sqlite3_value_text(pVal);
|
Changes to test/like.test.
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}
} {abc abcd ABC ABCD sort {} t11cnc}
do_test like-11.10 {
queryplan {
SELECT c FROM t11 WHERE c GLOB 'abc*' ORDER BY +a;
}
} {abc abcd sort {} t11cb}
finish_test
|
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}
} {abc abcd ABC ABCD sort {} t11cnc}
do_test like-11.10 {
queryplan {
SELECT c FROM t11 WHERE c GLOB 'abc*' ORDER BY +a;
}
} {abc abcd sort {} t11cb}
# A COLLATE clause on the pattern does not change the result of a
# LIKE operator.
#
do_execsql_test like-12.1 {
CREATE TABLE t12nc(id INTEGER, x TEXT UNIQUE COLLATE nocase);
INSERT INTO t12nc VALUES(1,'abcde'),(2,'uvwxy'),(3,'ABCDEF');
CREATE TABLE t12b(id INTEGER, x TEXT UNIQUE COLLATE binary);
INSERT INTO t12b VALUES(1,'abcde'),(2,'uvwxy'),(3,'ABCDEF');
SELECT id FROM t12nc WHERE x LIKE 'abc%' ORDER BY +id;
} {1 3}
do_execsql_test like-12.2 {
SELECT id FROM t12b WHERE x LIKE 'abc%' ORDER BY +id;
} {1 3}
do_execsql_test like-12.3 {
SELECT id FROM t12nc WHERE x LIKE 'abc%' COLLATE binary ORDER BY +id;
} {1 3}
do_execsql_test like-12.4 {
SELECT id FROM t12b WHERE x LIKE 'abc%' COLLATE binary ORDER BY +id;
} {1 3}
do_execsql_test like-12.5 {
SELECT id FROM t12nc WHERE x LIKE 'abc%' COLLATE nocase ORDER BY +id;
} {1 3}
do_execsql_test like-12.6 {
SELECT id FROM t12b WHERE x LIKE 'abc%' COLLATE nocase ORDER BY +id;
} {1 3}
# Adding a COLLATE clause to the pattern of a LIKE operator does nothing
# to change the suitability of using an index to satisfy that LIKE
# operator.
#
do_execsql_test like-12.11 {
EXPLAIN QUERY PLAN
SELECT id FROM t12nc WHERE x LIKE 'abc%' ORDER BY +id;
} {/SEARCH/}
do_execsql_test like-12.12 {
EXPLAIN QUERY PLAN
SELECT id FROM t12b WHERE x LIKE 'abc%' ORDER BY +id;
} {/SCAN/}
do_execsql_test like-12.13 {
EXPLAIN QUERY PLAN
SELECT id FROM t12nc WHERE x LIKE 'abc%' COLLATE nocase ORDER BY +id;
} {/SEARCH/}
do_execsql_test like-12.14 {
EXPLAIN QUERY PLAN
SELECT id FROM t12b WHERE x LIKE 'abc%' COLLATE nocase ORDER BY +id;
} {/SCAN/}
do_execsql_test like-12.15 {
EXPLAIN QUERY PLAN
SELECT id FROM t12nc WHERE x LIKE 'abc%' COLLATE binary ORDER BY +id;
} {/SEARCH/}
do_execsql_test like-12.16 {
EXPLAIN QUERY PLAN
SELECT id FROM t12b WHERE x LIKE 'abc%' COLLATE binary ORDER BY +id;
} {/SCAN/}
finish_test
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