diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/vdbe.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/src/vdbe.c b/src/vdbe.c index 45a47756e..34c3dd1fd 100644 --- a/src/vdbe.c +++ b/src/vdbe.c @@ -2714,10 +2714,9 @@ op_column_restart: if( pC->cacheStatus!=p->cacheCtr ){ /*OPTIMIZATION-IF-FALSE*/ if( pC->nullRow ){ - if( pC->eCurType==CURTYPE_PSEUDO ){ + if( pC->eCurType==CURTYPE_PSEUDO && pC->seekResult>0 ){ /* For the special case of as pseudo-cursor, the seekResult field ** identifies the register that holds the record */ - assert( pC->seekResult>0 ); pReg = &aMem[pC->seekResult]; assert( pReg->flags & MEM_Blob ); assert( memIsValid(pReg) ); @@ -5802,16 +5801,23 @@ case OP_Rowid: { /* out2 */ ** that occur while the cursor is on the null row will always ** write a NULL. ** -** Or, if P1 is a Pseudo-Cursor (a cursor opened using OP_OpenPseudo) -** just reset the cache for that cursor. This causes the row of -** content held by the pseudo-cursor to be reparsed. +** If cursor P1 is not previously opened, open it now to a special +** pseudo-cursor that always returns NULL for every column. */ case OP_NullRow: { VdbeCursor *pC; assert( pOp->p1>=0 && pOp->p1<p->nCursor ); pC = p->apCsr[pOp->p1]; - assert( pC!=0 ); + if( pC==0 ){ + /* If the cursor is not already open, create a special kind of + ** pseudo-cursor that always gives null rows. */ + pC = allocateCursor(p, pOp->p1, 1, CURTYPE_PSEUDO); + if( pC==0 ) goto no_mem; + pC->seekResult = 0; + pC->isTable = 1; + pC->uc.pCursor = sqlite3BtreeFakeValidCursor(); + } pC->nullRow = 1; pC->cacheStatus = CACHE_STALE; if( pC->eCurType==CURTYPE_BTREE ){ |