From cfad058333c69398337643f259f099a5c4da79b0 Mon Sep 17 00:00:00 2001
From: Ganlin Zhao <ganlinzhao@hotmail.com>
Date: Thu, 23 Jun 2022 13:58:36 +0800
Subject: [PATCH] fix(query): avg/stddev divide 0 handling

TD-16762
---
 source/libs/function/src/builtinsimpl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 647f039d96..5f3d1b89db 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -1774,6 +1774,11 @@ int32_t stddevFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
     pStddevRes->result = sqrt(fabs(pStddevRes->quadraticDSum / ((double)pStddevRes->count) - avg * avg));
   }
 
+  // check for overflow
+  if (isinf(pStddevRes->result) || isnan(pStddevRes->result)) {
+    GET_RES_INFO(pCtx)->numOfRes = 0;
+  }
+
   return functionFinalize(pCtx, pBlock);
 }
 
-- 
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