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Overview
| Comment: | Make sure the schema is verified prior to processing a "WHERE 0" on the first term of a compound SELECT statement. Fix for ticket [490a4b723562429] |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 52a49cbc1621094b2fe2b021209b768d |
| User & Date: | drh 2013-07-09 03:04:32 |
Context
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2013-07-09
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| 12:36 | Modify several extensions to use the new exported function naming. Fix some shared library compilation issues. check-in: 1e39f850 user: drh tags: trunk | |
| 03:04 | Make sure the schema is verified prior to processing a "WHERE 0" on the first term of a compound SELECT statement. Fix for ticket [490a4b723562429] check-in: 52a49cbc user: drh tags: trunk | |
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2013-07-08
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| 22:33 | Make sure an adequate number of digits are shown for binary-to-text rendering of very small floating point values. check-in: 776e65f9 user: drh tags: trunk | |
Changes
Changes to src/where.c.
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/* Split the WHERE clause into separate subexpressions where each
** subexpression is separated by an AND operator.
*/
initMaskSet(pMaskSet);
whereClauseInit(&pWInfo->sWC, pWInfo);
sqlite3ExprCodeConstants(pParse, pWhere);
whereSplit(&pWInfo->sWC, pWhere, TK_AND); /* IMP: R-15842-53296 */
/* Special case: a WHERE clause that is constant. Evaluate the
** expression and either jump over all of the code or fall thru.
*/
if( pWhere && (nTabList==0 || sqlite3ExprIsConstantNotJoin(pWhere)) ){
sqlite3ExprIfFalse(pParse, pWhere, pWInfo->iBreak, SQLITE_JUMPIFNULL);
pWhere = 0;
................................................................................
pWInfo->okOnePass = 1;
pWInfo->a[0].pWLoop->wsFlags &= ~WHERE_IDX_ONLY;
}
/* Open all tables in the pTabList and any indices selected for
** searching those tables.
*/
sqlite3CodeVerifySchema(pParse, -1); /* Insert the cookie verifier Goto */
notReady = ~(Bitmask)0;
for(ii=0, pLevel=pWInfo->a; ii<nTabList; ii++, pLevel++){
Table *pTab; /* Table to open */
int iDb; /* Index of database containing table/index */
struct SrcList_item *pTabItem;
pTabItem = &pTabList->a[pLevel->iFrom];
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/* Split the WHERE clause into separate subexpressions where each ** subexpression is separated by an AND operator. */ initMaskSet(pMaskSet); whereClauseInit(&pWInfo->sWC, pWInfo); sqlite3ExprCodeConstants(pParse, pWhere); whereSplit(&pWInfo->sWC, pWhere, TK_AND); /* IMP: R-15842-53296 */ sqlite3CodeVerifySchema(pParse, -1); /* Insert the cookie verifier Goto */ /* Special case: a WHERE clause that is constant. Evaluate the ** expression and either jump over all of the code or fall thru. */ if( pWhere && (nTabList==0 || sqlite3ExprIsConstantNotJoin(pWhere)) ){ sqlite3ExprIfFalse(pParse, pWhere, pWInfo->iBreak, SQLITE_JUMPIFNULL); pWhere = 0; ................................................................................ pWInfo->okOnePass = 1; pWInfo->a[0].pWLoop->wsFlags &= ~WHERE_IDX_ONLY; } /* Open all tables in the pTabList and any indices selected for ** searching those tables. */ notReady = ~(Bitmask)0; for(ii=0, pLevel=pWInfo->a; ii<nTabList; ii++, pLevel++){ Table *pTab; /* Table to open */ int iDb; /* Index of database containing table/index */ struct SrcList_item *pTabItem; pTabItem = &pTabList->a[pLevel->iFrom]; |
Changes to test/select9.test.
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} {~/SCAN TABLE/} ;# Uses indices with "x, y"
do_test select9-5.3 {
db eval {
EXPLAIN QUERY PLAN
SELECT x, y FROM v5 WHERE +x='12345' ORDER BY y;
}
} {/SCAN TABLE/} ;# Full table scan if the "+x" prevents index usage.
finish_test
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} {~/SCAN TABLE/} ;# Uses indices with "x, y"
do_test select9-5.3 {
db eval {
EXPLAIN QUERY PLAN
SELECT x, y FROM v5 WHERE +x='12345' ORDER BY y;
}
} {/SCAN TABLE/} ;# Full table scan if the "+x" prevents index usage.
# 2013-07-09: Ticket [490a4b7235624298]:
# "WHERE 0" on the first element of a UNION causes an assertion fault
#
do_execsql_test select9-6.1 {
CREATE TABLE t61(a);
CREATE TABLE t62(b);
INSERT INTO t61 VALUES(111);
INSERT INTO t62 VALUES(222);
SELECT a FROM t61 WHERE 0 UNION SELECT b FROM t62;
} {222}
do_execsql_test select9-6.2 {
SELECT a FROM t61 WHERE 0 UNION ALL SELECT b FROM t62;
} {222}
do_execsql_test select9-6.3 {
SELECT a FROM t61 UNION SELECT b FROM t62 WHERE 0;
} {111}
finish_test
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