diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 47efc29031b972818fbc540150613b61c0b199c5..c23ba15d44928bb4023c5615edb792f81b1de3d5 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -2701,8 +2701,11 @@ int32_t tscExprTopBottomIndex(SQueryInfo* pQueryInfo){
     SExprInfo* pExpr = tscExprGet(pQueryInfo, i);
     if (pExpr == NULL)
       continue;
-    if (pExpr->base.functionId == TSDB_FUNC_TOP || pExpr->base.functionId == TSDB_FUNC_BOTTOM
-        || pExpr->base.functionId == TSDB_FUNC_UNIQUE || pExpr->base.functionId == TSDB_FUNC_TAIL) {
+    if (pExpr->base.functionId == TSDB_FUNC_TOP 
+      || pExpr->base.functionId == TSDB_FUNC_BOTTOM 
+      || pExpr->base.functionId == TSDB_FUNC_SAMPLE 
+      || pExpr->base.functionId == TSDB_FUNC_UNIQUE 
+      || pExpr->base.functionId == TSDB_FUNC_TAIL) {
       return i;
     }
   }