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Further sanity checking of the OpenDup cursors.

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FossilOrigin-Name: 0ec71cf16983697f68ab8d921d80a5f39611e4cb5e6e19cbc4a9ad6d49bfc835
This commit is contained in:
drh
2021-03-18 15:42:59 +00:00
parent eeee8a5f01
commit 5a4a15fd2e
5 changed files with 30 additions and 27 deletions
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16
src/vdbe.c
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@@ -272,11 +272,6 @@ static VdbeCursor *allocateCursor(
assert( iCur>=0 && iCur<p->nCursor );
if( p->apCsr[iCur] ){ /*OPTIMIZATION-IF-FALSE*/
/* Before calling sqlite3VdbeFreeCursor(), ensure the isEphemeral flag
** is clear. Otherwise, if this is an ephemeral cursor created by
** OP_OpenDup, the cursor will not be closed and will still be part
** of a BtShared.pCursor list. */
if( p->apCsr[iCur]->pBtx==0 ) p->apCsr[iCur]->isEphemeral = 0;
sqlite3VdbeFreeCursor(p, p->apCsr[iCur]);
p->apCsr[iCur] = 0;
}
@@ -3873,7 +3868,7 @@ case OP_OpenDup: {
pOrig = p->apCsr[pOp->p2];
assert( pOrig );
assert( pOrig->pBtx ); /* Only ephemeral cursors can be duplicated */
assert( pOrig->isEphemeral ); /* Only ephemeral cursors can be duplicated */
pCx = allocateCursor(p, pOp->p1, pOrig->nField, -1, CURTYPE_BTREE);
if( pCx==0 ) goto no_mem;
@@ -3884,6 +3879,8 @@ case OP_OpenDup: {
pCx->pgnoRoot = pOrig->pgnoRoot;
pCx->isOrdered = pOrig->isOrdered;
pCx->pBtx = pOrig->pBtx;
pCx->hasBeenDuped = 1;
pOrig->hasBeenDuped = 1;
rc = sqlite3BtreeCursor(pCx->pBtx, pCx->pgnoRoot, BTREE_WRCSR,
pCx->pKeyInfo, pCx->uc.pCursor);
/* The sqlite3BtreeCursor() routine can only fail for the first cursor
@@ -3950,9 +3947,10 @@ case OP_OpenEphemeral: {
aMem[pOp->p3].z = "";
}
pCx = p->apCsr[pOp->p1];
if( pCx && ALWAYS(pCx->pBtx) ){
/* If the ephermeral table is already open, erase all existing content
** so that the table is empty again, rather than creating a new table. */
if( pCx && !pCx->hasBeenDuped ){
/* If the ephermeral table is already open and has no duplicates from
** OP_OpenDup, then erase all existing content so that the table is
** empty again, rather than creating a new table. */
assert( pCx->isEphemeral );
pCx->seqCount = 0;
pCx->cacheStatus = CACHE_STALE;