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Overview
| Comment: | Ensure that memory allocations in ANALYZE are always 8-byte aligned in order to satisfy a new assert() added by [539e4f661767ef90]. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
a1915cbdeccac2ed49fb8a9733abf2c6 |
| User & Date: | drh 2024-08-16 15:35:20 |
Context
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2024-08-16
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| 18:51 | If a subquery has an ORDER BY clause and that ordering is helpful in satisfying the ORDER BY or GROUP BY of the outer query without doing an extra sort, then omit or reduce the sort in the outer query. Call this the "order-by-subquery optimization". (check-in: 7a0cdc7e user: drh tags: trunk) | |
| 15:35 | Ensure that memory allocations in ANALYZE are always 8-byte aligned in order to satisfy a new assert() added by [539e4f661767ef90]. (check-in: a1915cbd user: drh tags: trunk) | |
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2024-08-15
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| 15:31 | Improved help message for --disable-tcl on the configure script. (check-in: 96e6cfb2 user: drh tags: trunk) | |
Changes
Changes to src/analyze.c.
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rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
sqlite3DbFree(db, zSql);
if( rc ) return rc;
while( sqlite3_step(pStmt)==SQLITE_ROW ){
int nIdxCol = 1; /* Number of columns in stat4 records */
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rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
sqlite3DbFree(db, zSql);
if( rc ) return rc;
while( sqlite3_step(pStmt)==SQLITE_ROW ){
int nIdxCol = 1; /* Number of columns in stat4 records */
char *zIndex; /* Index name */
Index *pIdx; /* Pointer to the index object */
int nSample; /* Number of samples */
int nByte; /* Bytes of space required */
int i; /* Bytes of space required */
tRowcnt *pSpace; /* Available allocated memory space */
u8 *pPtr; /* Available memory as a u8 for easier manipulation */
zIndex = (char *)sqlite3_column_text(pStmt, 0);
if( zIndex==0 ) continue;
nSample = sqlite3_column_int(pStmt, 1);
pIdx = findIndexOrPrimaryKey(db, zIndex, zDb);
assert( pIdx==0 || pIdx->nSample==0 );
if( pIdx==0 ) continue;
if( pIdx->aSample!=0 ){
/* The same index appears in sqlite_stat4 under multiple names */
continue;
}
assert( !HasRowid(pIdx->pTable) || pIdx->nColumn==pIdx->nKeyCol+1 );
if( !HasRowid(pIdx->pTable) && IsPrimaryKeyIndex(pIdx) ){
nIdxCol = pIdx->nKeyCol;
}else{
nIdxCol = pIdx->nColumn;
}
pIdx->nSampleCol = nIdxCol;
pIdx->mxSample = nSample;
nByte = ROUND8(sizeof(IndexSample) * nSample);
nByte += sizeof(tRowcnt) * nIdxCol * 3 * nSample;
nByte += nIdxCol * sizeof(tRowcnt); /* Space for Index.aAvgEq[] */
pIdx->aSample = sqlite3DbMallocZero(db, nByte);
if( pIdx->aSample==0 ){
sqlite3_finalize(pStmt);
return SQLITE_NOMEM_BKPT;
}
pPtr = (u8*)pIdx->aSample;
pPtr += ROUND8(nSample*sizeof(pIdx->aSample[0]));
pSpace = (tRowcnt*)pPtr;
assert( EIGHT_BYTE_ALIGNMENT( pSpace ) );
pIdx->aAvgEq = pSpace; pSpace += nIdxCol;
pIdx->pTable->tabFlags |= TF_HasStat4;
for(i=0; i<nSample; i++){
pIdx->aSample[i].anEq = pSpace; pSpace += nIdxCol;
pIdx->aSample[i].anLt = pSpace; pSpace += nIdxCol;
pIdx->aSample[i].anDLt = pSpace; pSpace += nIdxCol;
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