diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/btree.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/src/btree.c b/src/btree.c index fbfc67a79..fe0112ced 100644 --- a/src/btree.c +++ b/src/btree.c @@ -6817,8 +6817,13 @@ static void insertCell( ** are used and they point to the leaf pages only, and the ixNx value are: ** ** ixNx[0] = Number of cells in Child-1. -** ixNx[1] = Number of cells in Child-1 and Child-2 + 1 for 1st divider. -** ixNx[2] = Number of cells in Child-1 and Child-2 + both divider cells +** ixNx[1] = Number of cells in Child-1 and Child-2. +** ixNx[2] = Total number of cells. +** +** Sometimes when deleting, a child page can have zero cells. In those +** cases, ixNx[] entries with higher indexes, and the corresponding apEnd[] +** entries, shift down. The end result is that each ixNx[] entry should +** be larger than the previous */ typedef struct CellArray CellArray; struct CellArray { @@ -7747,6 +7752,9 @@ static int balance_nonroot( MemPage *p = apOld[i]; b.apEnd[k] = p->aDataEnd; b.ixNx[k] = cntOld[i]; + if( k && b.ixNx[k]==b.ixNx[k-1] ){ + k--; /* Omit b.ixNx[] entry for child pages with no cells */ + } if( !leafData ){ k++; b.apEnd[k] = pParent->aDataEnd; @@ -7978,18 +7986,17 @@ static int balance_nonroot( if( ISAUTOVACUUM ){ MemPage *pOld; MemPage *pNew = pOld = apNew[0]; - u8 *aOld = pNew->aData; int cntOldNext = pNew->nCell + pNew->nOverflow; - int usableSize = pBt->usableSize; int iNew = 0; int iOld = 0; for(i=0; i<b.nCell; i++){ u8 *pCell = b.apCell[i]; - if( i==cntOldNext ){ - pOld = (++iOld)<nNew ? apNew[iOld] : apOld[iOld]; + while( i==cntOldNext ){ + iOld++; + assert( iOld<nNew || iOld<nOld ); + pOld = iOld<nNew ? apNew[iOld] : apOld[iOld]; cntOldNext += pOld->nCell + pOld->nOverflow + !leafData; - aOld = pOld->aData; } if( i==cntNew[iNew] ){ pNew = apNew[++iNew]; @@ -8004,7 +8011,7 @@ static int balance_nonroot( ** overflow cell), we can skip updating the pointer map entries. */ if( iOld>=nNew || pNew->pgno!=aPgno[iOld] - || !SQLITE_WITHIN(pCell,aOld,&aOld[usableSize]) + || !SQLITE_WITHIN(pCell,pOld->aData,pOld->aDataEnd) ){ if( !leafCorrection ){ ptrmapPut(pBt, get4byte(pCell), PTRMAP_BTREE, pNew->pgno, &rc); |