1 files changed, 3 insertions, 0 deletions
diff --git a/src/wherecode.c b/src/wherecode.c
index d547a7117..9a4961d29 100644
--- a/src/wherecode.c
+++ b/src/wherecode.c
@@ -446,6 +446,7 @@ static int codeEqualityTerm(
     }else{
       Select *pSelect = pX->x.pSelect;
       sqlite3 *db = pParse->db;
+      u16 savedDbOptFlags = db->dbOptFlags;
       ExprList *pOrigRhs = pSelect->pEList;
       ExprList *pOrigLhs = pX->pLeft->x.pList;
       ExprList *pRhs = 0;         /* New Select.pEList for RHS */
@@ -489,7 +490,9 @@ static int codeEqualityTerm(
           testcase( aiMap==0 );
         }
         pSelect->pEList = pRhs;
+        db->dbOptFlags |= SQLITE_QueryFlattener;
         eType = sqlite3FindInIndex(pParse, pX, IN_INDEX_LOOP, 0, aiMap);
+        db->dbOptFlags = savedDbOptFlags;
         testcase( aiMap!=0 && aiMap[0]!=0 );
         pSelect->pEList = pOrigRhs;
         pLeft->x.pList = pOrigLhs;