diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 2d889dd925e893c0684a3317c4fe2a6e3eb1d671..4ead1147e47e8777a422cd8f63a74d4017a368a5 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -642,7 +642,6 @@ static int32_t doTrimFunction(SScalarParam *pInput, int32_t inputNum, SScalarPar
     int32_t charLen = (type == TSDB_DATA_TYPE_VARCHAR) ? len : len / TSDB_NCHAR_SIZE;
     trimFn(input, output, type, charLen);
 
-    varDataSetLen(output, len);
     colDataAppend(pOutputData, i, output, false);
     output += varDataTLen(output);
   }