Index: src/expr.c
==================================================================
--- src/expr.c
+++ src/expr.c
@@ -5232,13 +5232,15 @@
   Walker w;
   p = sqlite3ExprSkipCollateAndLikely(p);
   if( p==0 ) return 0;
   if( p->op==TK_NOTNULL ){
     p = p->pLeft;
-  }else if( p->op==TK_AND ){
-    if( sqlite3ExprImpliesNonNullRow(p->pLeft, iTab) ) return 1;
-    p = p->pRight;
+  }else{
+    while( p->op==TK_AND ){
+      if( sqlite3ExprImpliesNonNullRow(p->pLeft, iTab) ) return 1;
+      p = p->pRight;
+    }
   }
   w.xExprCallback = impliesNotNullRow;
   w.xSelectCallback = 0;
   w.xSelectCallback2 = 0;
   w.eCode = 0;