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Small size reduction and performance increase in the sqlite3BtreeInsert()

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logic.

FossilOrigin-Name: 656aa1ecf5129ae43c56a990e95038b5d8cbdcee
This commit is contained in:
drh
2016-05-21 11:23:26 +00:00
parent ed90a4676e
commit cb89f4aba8
3 changed files with 17 additions and 12 deletions
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15
src/btree.c
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@@ -6310,6 +6310,8 @@ static void dropCell(MemPage *pPage, int idx, int sz, int *pRC){
** in pTemp or the original pCell) and also record its index.
** Allocating a new entry in pPage->aCell[] implies that
** pPage->nOverflow is incremented.
**
** *pRC must be SQLITE_OK when this routine is called.
*/
static void insertCell(
MemPage *pPage, /* Page into which we are copying */
@@ -6325,8 +6327,7 @@ static void insertCell(
u8 *data; /* The content of the whole page */
u8 *pIns; /* The point in pPage->aCellIdx[] where no cell inserted */
if( *pRC ) return;
assert( *pRC==SQLITE_OK );
assert( i>=0 && i<=pPage->nCell+pPage->nOverflow );
assert( MX_CELL(pPage->pBt)<=10921 );
assert( pPage->nCell<=MX_CELL(pPage->pBt) || CORRUPT_DB );
@@ -6832,8 +6833,10 @@ static int balance_quick(MemPage *pParent, MemPage *pPage, u8 *pSpace){
while( ((*(pOut++) = *(pCell++))&0x80) && pCell<pStop );
/* Insert the new divider cell into pParent. */
insertCell(pParent, pParent->nCell, pSpace, (int)(pOut-pSpace),
0, pPage->pgno, &rc);
if( rc==SQLITE_OK ){
insertCell(pParent, pParent->nCell, pSpace, (int)(pOut-pSpace),
0, pPage->pgno, &rc);
}
/* Set the right-child pointer of pParent to point to the new page. */
put4byte(&pParent->aData[pParent->hdrOffset+8], pgnoNew);
@@ -8215,7 +8218,9 @@ int sqlite3BtreeDelete(BtCursor *pCur, u8 flags){
pTmp = pBt->pTmpSpace;
assert( pTmp!=0 );
rc = sqlite3PagerWrite(pLeaf->pDbPage);
insertCell(pPage, iCellIdx, pCell-4, nCell+4, pTmp, n, &rc);
if( rc==SQLITE_OK ){
insertCell(pPage, iCellIdx, pCell-4, nCell+4, pTmp, n, &rc);
}
dropCell(pLeaf, pLeaf->nCell-1, nCell, &rc);
if( rc ) return rc;
}