Index: src/whereexpr.c
==================================================================
--- src/whereexpr.c
+++ src/whereexpr.c
@@ -1382,13 +1382,15 @@
   if( p->op==TK_COLUMN ){
     return sqlite3WhereGetMask(pMaskSet, p->iTable);
   }
   mask = (p->op==TK_IF_NULL_ROW) ? sqlite3WhereGetMask(pMaskSet, p->iTable) : 0;
   assert( !ExprHasProperty(p, EP_TokenOnly) );
-  if( p->pRight ) mask |= sqlite3WhereExprUsage(pMaskSet, p->pRight);
   if( p->pLeft ) mask |= sqlite3WhereExprUsage(pMaskSet, p->pLeft);
-  if( ExprHasProperty(p, EP_xIsSelect) ){
+  if( p->pRight ){
+    mask |= sqlite3WhereExprUsage(pMaskSet, p->pRight);
+    assert( p->x.pList==0 );
+  }else if( ExprHasProperty(p, EP_xIsSelect) ){
     if( ExprHasProperty(p, EP_VarSelect) ) pMaskSet->bVarSelect = 1;
     mask |= exprSelectUsage(pMaskSet, p->x.pSelect);
   }else if( p->x.pList ){
     mask |= sqlite3WhereExprListUsage(pMaskSet, p->x.pList);
   }