database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-11 01:42:22 +03:00
Code Activity

An index might be useful for ORDER BY if any indexed column is in the

Browse Source 
ORDER BY clause, not just the first indexed column.

FossilOrigin-Name: ade473b5ae3fe2162b0ec29731d8e864a9301e07
This commit is contained in:
drh
2013-06-13 17:58:08 +00:00
parent 53cfbe92d1
commit 6d38147c19
3 changed files with 11 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
src/where.c
View File

@@ -4370,18 +4370,17 @@ static int indexMightHelpWithOrderBy(
int iCursor
){
ExprList *pOB;
int iCol;
int ii;
int ii, jj;
if( pIndex->bUnordered ) return 0;
if( (pOB = pBuilder->pWInfo->pOrderBy)==0 ) return 0;
iCol = pIndex->aiColumn[0];
for(ii=0; ii<pOB->nExpr; ii++){
Expr *pExpr = sqlite3ExprSkipCollate(pOB->a[ii].pExpr);
if( pExpr->op!=TK_COLUMN ) return 0;
if( pExpr->iTable==iCursor ){
if( pExpr->iColumn==iCol ) return 1;
return 0;
for(jj=0; jj<pIndex->nColumn; jj++){
if( pExpr->iColumn==pIndex->aiColumn[jj] ) return 1;
}
}
}
return 0;