From c48d37758218623a47b48170a6e2ce892100149a Mon Sep 17 00:00:00 2001
From: sima <simondominic9997@outlook.com>
Date: Tue, 6 Aug 2024 16:26:32 +0800
Subject: [PATCH] fix:[TD-31264] fix wrong result when using concat multi-byte
 character with nchar.

---
 source/libs/scalar/src/sclfunc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 23cc7324f0..cd67b89208 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -401,8 +401,8 @@ static int32_t concatCopyHelper(const char *input, char *output, bool hasNchar,
       taosMemoryFree(newBuf);
       return TSDB_CODE_SCALAR_CONVERT_ERROR;
     }
-    (void)memcpy(varDataVal(output) + *dataLen, newBuf, varDataLen(input) * TSDB_NCHAR_SIZE);
-    *dataLen += varDataLen(input) * TSDB_NCHAR_SIZE;
+    (void)memcpy(varDataVal(output) + *dataLen, newBuf, len);
+    *dataLen += len;
     taosMemoryFree(newBuf);
   } else {
     (void)memcpy(varDataVal(output) + *dataLen, varDataVal(input), varDataLen(input));