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Overview
| Comment: | Use OP_Copy instead of OP_SCopy when moving results out of a subquery, to prevent the subquery results from changing out from under the outer query. Fix for ticket [98825a79ce1456]. Problem introduced by check-in [1e64dd782a126f48d78]. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | branch-3.8.4 |
| Files: | files | file ages | folders |
| SHA1: |
ec6a06246e04eee5f25f1c28507df73b |
| User & Date: | drh 2014-04-03 16:16:36 |
| Original Comment: | Use OP_Copy instead of OP_SCopy when moving results out of a subquery, to prevent the subquery results from changing out from under the outer query. Fix for ticket [1e64dd782a126f48d78]. |
References
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2017-10-27
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| 23:28 | I was a little concerned about this check-in. Though I could not generate a failure myself, I thought it was risky. I checked it in for further testing. Then, overnight, OSSFuzz found a failure case for me. So the change is now moved out into a deadend branch. Was: Use OP_SCopy rather than OP_Copy to transfer results from a co-routine to its consumer. This undoes an earlier fix for ticket [98825a79ce] by check-in [ec6a06246e] because that problem no longer occurs due to WHERE clause push-down. Closed-Leaf check-in: 0926df09 user: drh tags: mistake | |
Context
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2014-04-03
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| 16:29 | Use OP_Copy instead of OP_SCopy when moving results out of a subquery, to prevent the subquery results from changing out from under the outer query. Fix for ticket [98825a79ce1456]. Problem introduced by check-in [1e64dd782a126f48d78]. check-in: d5513dfa user: drh tags: trunk | |
| 16:18 | Increase the version number to 3.8.4.3 check-in: f05a49b6 user: drh tags: branch-3.8.4 | |
| 16:16 | Use OP_Copy instead of OP_SCopy when moving results out of a subquery, to prevent the subquery results from changing out from under the outer query. Fix for ticket [98825a79ce1456]. Problem introduced by check-in [1e64dd782a126f48d78]. check-in: ec6a0624 user: drh tags: branch-3.8.4 | |
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2014-03-26
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| 18:51 | Version 3.8.4.2 check-in: 02ea1663 user: drh tags: release, version-3.8.4.2, branch-3.8.4 | |
Changes
Changes to src/where.c.
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if( pTabItem->viaCoroutine && !db->mallocFailed ){
last = sqlite3VdbeCurrentAddr(v);
k = pLevel->addrBody;
pOp = sqlite3VdbeGetOp(v, k);
for(; k<last; k++, pOp++){
if( pOp->p1!=pLevel->iTabCur ) continue;
if( pOp->opcode==OP_Column ){
pOp->opcode = OP_SCopy;
pOp->p1 = pOp->p2 + pTabItem->regResult;
pOp->p2 = pOp->p3;
pOp->p3 = 0;
}else if( pOp->opcode==OP_Rowid ){
pOp->opcode = OP_Null;
pOp->p1 = 0;
pOp->p3 = 0;
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5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 |
if( pTabItem->viaCoroutine && !db->mallocFailed ){
last = sqlite3VdbeCurrentAddr(v);
k = pLevel->addrBody;
pOp = sqlite3VdbeGetOp(v, k);
for(; k<last; k++, pOp++){
if( pOp->p1!=pLevel->iTabCur ) continue;
if( pOp->opcode==OP_Column ){
pOp->opcode = OP_Copy;
pOp->p1 = pOp->p2 + pTabItem->regResult;
pOp->p2 = pOp->p3;
pOp->p3 = 0;
}else if( pOp->opcode==OP_Rowid ){
pOp->opcode = OP_Null;
pOp->p1 = 0;
pOp->p3 = 0;
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