diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/where.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/src/where.c b/src/where.c index 7a8342675..54e4ea819 100644 --- a/src/where.c +++ b/src/where.c @@ -791,13 +791,13 @@ static void constructAutomaticIndex( idxCols = 0; for(pTerm=pWC->a; pTerm<pWCEnd; pTerm++){ Expr *pExpr = pTerm->pExpr; - assert( !ExprHasProperty(pExpr, EP_FromJoin) /* prereq always non-zero */ - || pExpr->iRightJoinTable!=pSrc->iCursor /* for the right-hand */ - || pLoop->prereq!=0 ); /* table of a LEFT JOIN */ - if( pLoop->prereq==0 - && (pTerm->wtFlags & TERM_VIRTUAL)==0 - && !ExprHasProperty(pExpr, EP_FromJoin) - && sqlite3ExprIsTableConstant(pExpr, pSrc->iCursor) ){ + /* Make the automatic index a partial index if there are terms in the + ** WHERE clause (or the ON clause of a LEFT join) that constrain which + ** rows of the target table (pSrc) that can be used. */ + if( (pTerm->wtFlags & TERM_VIRTUAL)==0 + && ((pSrc->fg.jointype&JT_LEFT)==0 || ExprHasProperty(pExpr,EP_FromJoin)) + && sqlite3ExprIsTableConstant(pExpr, pSrc->iCursor) + ){ pPartial = sqlite3ExprAnd(pParse, pPartial, sqlite3ExprDup(pParse->db, pExpr, 0)); } |