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Overview
| Comment: | Harden the STAT4 logic in where.c against OOM faults. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 91d2cfbc95c34c0040deb69106bb9f89 |
| User & Date: | drh 2013-09-03 19:26:22 |
Context
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2013-09-04
| ||
| 02:07 | Conditionally exclude code from analyze.c that is not used by STAT3. check-in: a48948a1 user: drh tags: trunk | |
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2013-09-03
| ||
| 19:26 | Harden the STAT4 logic in where.c against OOM faults. check-in: 91d2cfbc user: drh tags: trunk | |
| 14:43 | Fix another problem in stat4 sample selection. check-in: d59f5809 user: dan tags: trunk | |
Changes
Changes to src/where.c.
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 |
Parse *pParse, /* Database connection */
Index *pIdx, /* Index to consider domain of */
UnpackedRecord *pRec, /* Vector of values to consider */
int roundUp, /* Round up if true. Round down if false */
tRowcnt *aStat /* OUT: stats written here */
){
IndexSample *aSample = pIdx->aSample;
int iCol = pRec->nField-1; /* Index of required stats in anEq[] etc. */
int iMin = 0; /* Smallest sample not yet tested */
int i = pIdx->nSample; /* Smallest sample larger than or equal to pRec */
int iTest; /* Next sample to test */
int res; /* Result of comparison operation */
assert( pIdx->nSample>0 );
assert( pRec->nField>0 && iCol<pIdx->nSampleCol );
do{
iTest = (iMin+i)/2;
res = sqlite3VdbeRecordCompare(aSample[iTest].n, aSample[iTest].p, pRec);
if( res<0 ){
iMin = iTest+1;
|
| > > > |
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 |
Parse *pParse, /* Database connection */
Index *pIdx, /* Index to consider domain of */
UnpackedRecord *pRec, /* Vector of values to consider */
int roundUp, /* Round up if true. Round down if false */
tRowcnt *aStat /* OUT: stats written here */
){
IndexSample *aSample = pIdx->aSample;
int iCol; /* Index of required stats in anEq[] etc. */
int iMin = 0; /* Smallest sample not yet tested */
int i = pIdx->nSample; /* Smallest sample larger than or equal to pRec */
int iTest; /* Next sample to test */
int res; /* Result of comparison operation */
assert( pRec!=0 || pParse->db->mallocFailed );
if( pRec==0 ) return;
iCol = pRec->nField - 1;
assert( pIdx->nSample>0 );
assert( pRec->nField>0 && iCol<pIdx->nSampleCol );
do{
iTest = (iMin+i)/2;
res = sqlite3VdbeRecordCompare(aSample[iTest].n, aSample[iTest].p, pRec);
if( res<0 ){
iMin = iTest+1;
|