From ee602ffb6673b74852da24d5415b38db602a272e Mon Sep 17 00:00:00 2001
From: dapan1121 <wpan@taosdata.com>
Date: Tue, 29 Dec 2020 02:52:57 +0000
Subject: [PATCH] fix bug

---
 src/client/src/tscFunctionImpl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/client/src/tscFunctionImpl.c b/src/client/src/tscFunctionImpl.c
index 22240efe14..3a01a9b281 100644
--- a/src/client/src/tscFunctionImpl.c
+++ b/src/client/src/tscFunctionImpl.c
@@ -921,6 +921,10 @@ static void minMax_function(SQLFunctionCtx *pCtx, char *pOutput, int32_t isMin,
     *notNullElems = pCtx->size - pCtx->preAggVals.statis.numOfNull;
     assert(*notNullElems >= 0);
     
+    if (*notNullElems == 0){
+      return;
+    }
+
     void *  tval = NULL;
     int16_t index = 0;
     
-- 
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