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| author | drh <drh@noemail.net> | 2019-12-18 20:51:58 +0000 |
|---|---|---|
| committer | drh <drh@noemail.net> | 2019-12-18 20:51:58 +0000 |
| commit | 396afe6f6aa90a31303c183e11b2b2d4b7956b35 (patch) | |
| tree | 616244fdd680e0c166a3ca19a4e997b188a51586 /src/expr.c | |
| parent | 6e1c45ef2ee3aaea9e1f89e1cfa036c0f112e92c (diff) | |
| download | sqlite-396afe6f6aa90a31303c183e11b2b2d4b7956b35.tar.gz sqlite-396afe6f6aa90a31303c183e11b2b2d4b7956b35.zip | |
Continue to back away from the LEFT JOIN optimization of check-in [41c27bc0ff1d3135]
by disallowing query flattening if the outer query is DISTINCT. Without this fix,
if an index scan is run on the table within the view on the right-hand side of the
LEFT JOIN, stale result registers might be accessed yielding incorrect results,
and/or an OP_IfNullRow opcode might be invoked on the un-opened table, resulting
in a NULL-pointer dereference. This problem was found by the Yongheng and Rui fuzzer.
FossilOrigin-Name: 862974312edf00e9d1068115d1a39b7235b7db68b6d86b81d38a12f025a4748e
Diffstat (limited to 'src/expr.c')
0 files changed, 0 insertions, 0 deletions