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Do not do full table scans of unordered indices.

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FossilOrigin-Name: a8761a9128de945aa4b6196df5ffe64115d66b61
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drh
2011-04-15 14:46:27 +00:00
parent d4a80312b8
commit 3e9548b30d
4 changed files with 14 additions and 9 deletions
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4
src/select.c
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@@ -4239,11 +4239,13 @@ int sqlite3Select(
** and pKeyInfo to the KeyInfo structure required to navigate the
** index.
**
** (2011-04-15) Do not do a full scan of an unordered index.
**
** In practice the KeyInfo structure will not be used. It is only
** passed to keep OP_OpenRead happy.
*/
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
if( !pBest || pIdx->nColumn<pBest->nColumn ){
if( pIdx->bUnordered==0 && (!pBest || pIdx->nColumn<pBest->nColumn) ){
pBest = pIdx;
}
}