From 56a715b5d52d64741dc1843ee8f2659d0237857f Mon Sep 17 00:00:00 2001
From: Ganlin Zhao <ganlinzhao@hotmail.com>
Date: Tue, 27 Jun 2023 14:32:35 +0800
Subject: [PATCH] fix: fix result of first can be 0 occasionally

---
 source/libs/function/src/builtinsimpl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 4365cd8b95..1c5bd6d59c 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -2415,6 +2415,10 @@ int32_t lastFunction(SqlFunctionCtx* pCtx) {
 }
 
 static int32_t firstLastTransferInfoImpl(SFirstLastRes* pInput, SFirstLastRes* pOutput, bool isFirst) {
+  if (!pInput->hasResult) {
+    return TSDB_CODE_FAILED;
+  }
+
   if (pOutput->hasResult) {
     if (isFirst) {
       if (pInput->ts > pOutput->ts) {