1 files changed, 18 insertions, 8 deletions
diff --git a/src/expr.c b/src/expr.c
index 6ad789a3d..1b18828dd 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1877,18 +1877,30 @@ SrcList *sqlite3SrcListDup(sqlite3 *db, const SrcList *p, int flags){
     SrcItem *pNewItem = &pNew->a[i];
     const SrcItem *pOldItem = &p->a[i];
     Table *pTab;
-    if( pOldItem->fg.fixedSchema ){
+    pNewItem->fg = pOldItem->fg;
+    if( pOldItem->fg.isSubquery ){
+      Subquery *pNewSubq = sqlite3DbMallocRaw(db, sizeof(Subquery));
+      if( pNewSubq==0 ){
+        assert( db->mallocFailed );
+        pNewItem->fg.isSubquery = 0;
+      }else{
+        memcpy(pNewSubq, pOldItem->u4.pSubq, sizeof(*pNewSubq));
+        pNewSubq->pSelect = sqlite3SelectDup(db, pNewSubq->pSelect, flags);
+        if( pNewSubq->pSelect==0 ){
+          sqlite3DbFree(db, pNewSubq);
+          pNewSubq = 0;
+          pNewItem->fg.isSubquery = 0;
+        }
+      }
+      pNewItem->u4.pSubq = pNewSubq;
+    }else if( pOldItem->fg.fixedSchema ){
       pNewItem->u4.pSchema = pOldItem->u4.pSchema;
     }else{
       pNewItem->u4.zDatabase = sqlite3DbStrDup(db, pOldItem->u4.zDatabase);
     }
     pNewItem->zName = sqlite3DbStrDup(db, pOldItem->zName);
     pNewItem->zAlias = sqlite3DbStrDup(db, pOldItem->zAlias);
-    pNewItem->fg = pOldItem->fg;
     pNewItem->iCursor = pOldItem->iCursor;
-    pNewItem->sq.addrFillSub = pOldItem->sq.addrFillSub;
-    pNewItem->sq.regReturn = pOldItem->sq.regReturn;
-    pNewItem->sq.regResult = pOldItem->sq.regResult;
     if( pNewItem->fg.isIndexedBy ){
       pNewItem->u1.zIndexedBy = sqlite3DbStrDup(db, pOldItem->u1.zIndexedBy);
     }else if( pNewItem->fg.isTabFunc ){
@@ -1905,7 +1917,6 @@ SrcList *sqlite3SrcListDup(sqlite3 *db, const SrcList *p, int flags){
     if( pTab ){
       pTab->nTabRef++;
     }
-    pNewItem->sq.pSelect = sqlite3SelectDup(db, pOldItem->sq.pSelect, flags);
     if( pOldItem->fg.isUsing ){
       assert( pNewItem->fg.isUsing );
       pNewItem->u3.pUsing = sqlite3IdListDup(db, pOldItem->u3.pUsing);
@@ -1979,7 +1990,6 @@ Select *sqlite3SelectDup(sqlite3 *db, const Select *pDup, int flags){
     pp = &pNew->pPrior;
     pNext = pNew;
   }
-
   return pRet;
 }
 #else
@@ -2999,7 +3009,7 @@ static Select *isCandidateForInOpt(const Expr *pX){
   pSrc = p->pSrc;
   assert( pSrc!=0 );
   if( pSrc->nSrc!=1 ) return 0;          /* Single term in FROM clause */
-  if( pSrc->a[0].sq.pSelect ) return 0;  /* FROM is not a subquery or view */
+  if( pSrc->a[0].fg.isSubquery) return 0;/* FROM is not a subquery or view */
   pTab = pSrc->a[0].pSTab;
   assert( pTab!=0 );
   assert( !IsView(pTab)  );              /* FROM clause is not a view */