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Overview
| Comment: | Initialize variables differently in the range processing logic of where.c in order to make sure variables are always initialized even following an OOM error. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
3fb3686a4502140720dc3710a28a4f41 |
| User & Date: | drh 2009-08-25 15:56:51 |
Context
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2009-08-25
| ||
| 16:28 | Remove an unreachable branch from where.c in order to restore 100% branch test coverage. Add assert() and testcase() macros to verify that the branch is unreachable. check-in: 58db7e71 user: drh tags: trunk | |
| 15:56 | Initialize variables differently in the range processing logic of where.c in order to make sure variables are always initialized even following an OOM error. check-in: 3fb3686a user: drh tags: trunk | |
| 14:59 | Attempt to clarify the meaning of a "parameter" in the sqlite3_bind() API documentation. check-in: 9389e6a7 user: drh tags: trunk | |
Changes
Changes to src/where.c.
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#ifdef SQLITE_ENABLE_STAT2
sqlite3 *db = pParse->db;
sqlite3_value *pLowerVal = 0;
sqlite3_value *pUpperVal = 0;
if( nEq==0 && p->aSample ){
int iEst;
int iUpper;
int iLower;
u8 aff = p->pTable->aCol[0].affinity;
if( pLower ){
Expr *pExpr = pLower->pExpr->pRight;
rc = sqlite3ValueFromExpr(db, pExpr, SQLITE_UTF8, aff, &pLowerVal);
}
if( rc==SQLITE_OK && pUpper ){
................................................................................
if( rc!=SQLITE_OK || (pLowerVal==0 && pUpperVal==0) ){
sqlite3ValueFree(pLowerVal);
sqlite3ValueFree(pUpperVal);
goto range_est_fallback;
}else if( pLowerVal==0 ){
rc = whereRangeRegion(pParse, p, pUpperVal, &iUpper);
iLower = pLower ? iUpper/2 : 0;
}else if( pUpperVal==0 ){
rc = whereRangeRegion(pParse, p, pLowerVal, &iLower);
iUpper = pUpper ? (iLower + SQLITE_INDEX_SAMPLES + 1)/2
: SQLITE_INDEX_SAMPLES;
}else{
rc = whereRangeRegion(pParse, p, pUpperVal, &iUpper);
if( rc==SQLITE_OK ){
rc = whereRangeRegion(pParse, p, pLowerVal, &iLower);
}else{
iLower = 0;
}
}
iEst = iUpper - iLower;
if( iEst>SQLITE_INDEX_SAMPLES ){
iEst = SQLITE_INDEX_SAMPLES;
}else if( iEst<1 ){
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#ifdef SQLITE_ENABLE_STAT2
sqlite3 *db = pParse->db;
sqlite3_value *pLowerVal = 0;
sqlite3_value *pUpperVal = 0;
if( nEq==0 && p->aSample ){
int iEst;
int iLower = 0;
int iUpper = SQLITE_INDEX_SAMPLES;
u8 aff = p->pTable->aCol[0].affinity;
if( pLower ){
Expr *pExpr = pLower->pExpr->pRight;
rc = sqlite3ValueFromExpr(db, pExpr, SQLITE_UTF8, aff, &pLowerVal);
}
if( rc==SQLITE_OK && pUpper ){
................................................................................
if( rc!=SQLITE_OK || (pLowerVal==0 && pUpperVal==0) ){
sqlite3ValueFree(pLowerVal);
sqlite3ValueFree(pUpperVal);
goto range_est_fallback;
}else if( pLowerVal==0 ){
rc = whereRangeRegion(pParse, p, pUpperVal, &iUpper);
if( pLower ) iLower = iUpper/2;
}else if( pUpperVal==0 ){
rc = whereRangeRegion(pParse, p, pLowerVal, &iLower);
if( pUpper ) iUpper = (iLower + SQLITE_INDEX_SAMPLES + 1)/2;
}else{
rc = whereRangeRegion(pParse, p, pUpperVal, &iUpper);
if( rc==SQLITE_OK ){
rc = whereRangeRegion(pParse, p, pLowerVal, &iLower);
}
}
iEst = iUpper - iLower;
if( iEst>SQLITE_INDEX_SAMPLES ){
iEst = SQLITE_INDEX_SAMPLES;
}else if( iEst<1 ){
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