Do not allow automatic indices for the RHS of IN expressions which are not

correlated subqueries.  Ticket [8011086c85c6c404014c9]

FossilOrigin-Name: 267492d3a7eff7b7b24ed6bd6d6ff55148fe37f3

1 files changed, 8 insertions, 2 deletions

diff --git a/src/expr.c b/src/expr.c
index bd28bf939..153751f7c 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1512,14 +1512,20 @@ int sqlite3FindInIndex(Parse *pParse, Expr *pX, int *prNotFound){
     /* Could not found an existing table or index to use as the RHS b-tree.
     ** We will have to generate an ephemeral table to do the job.
     */
+    double savedNQueryLoop = pParse->nQueryLoop;
     int rMayHaveNull = 0;
     eType = IN_INDEX_EPH;
     if( prNotFound ){
       *prNotFound = rMayHaveNull = ++pParse->nMem;
-    }else if( pX->pLeft->iColumn<0 && !ExprHasAnyProperty(pX, EP_xIsSelect) ){
-      eType = IN_INDEX_ROWID;
+    }else{
+      testcase( pParse->nQueryLoop>(double)1 );
+      pParse->nQueryLoop = (double)1;
+      if( pX->pLeft->iColumn<0 && !ExprHasAnyProperty(pX, EP_xIsSelect) ){
+        eType = IN_INDEX_ROWID;
+      }
     }
     sqlite3CodeSubselect(pParse, pX, rMayHaveNull, eType==IN_INDEX_ROWID);
+    pParse->nQueryLoop = savedNQueryLoop;
   }else{
     pX->iTable = iTab;
   }