From 5a53e2356359c917454ccd9771630094d6a1bb71 Mon Sep 17 00:00:00 2001
From: Alex Duan <417921451@qq.com>
Date: Tue, 21 Jun 2022 19:38:39 +0800
Subject: [PATCH] fix(query): fixed stddev prevData calc value

---
 src/query/src/qExecutor.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index e92666ca31..7d4b0b7edb 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -4315,14 +4315,15 @@ void setParamForStableStddevByColData(SQueryRuntimeEnv* pRuntimeEnv, SQLFunction
     // find colid in dataBlock
     int32_t bytes, offset = 0;
     char*   val = NULL;
+    char* prevData = pInfo->prevData + sizeof(int32_t); // head is key length (int32_t type)
     for (int32_t idx = 0; idx < taosArrayGetSize(pInfo->pGroupbyDataInfo); idx++) {
       SGroupbyDataInfo *pDataInfo = taosArrayGet(pInfo->pGroupbyDataInfo, idx);
       if (pDataInfo->index == pExpr1->colInfo.colId) {
         bytes = pDataInfo->bytes;
-        val   = pInfo->prevData + offset;
+        val   = prevData + offset;
         break;
       }
-      offset += pDataInfo->bytes;
+      offset += pDataInfo->bytes + strlen(MULTI_KEY_DELIM); // multi value split by MULTI_KEY_DELIM
     }
     if (val == NULL) { continue; }
 
-- 
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