diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index b6fe38e5c2366c89f121a3024c4718b1d881911f..c9edd50226476a8fa21331b9ed48e9a716dd654e 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -632,6 +632,7 @@ int32_t tscGetDataBlockFromList(void* pHashList, SDataBlockList* pDataBlockList,
 }
 
 static void trimDataBlock(void* pDataBlock, STableDataBlocks* pTableDataBlock) {
+  // TODO: optimize this function
   int32_t firstPartLen = 0;
 
   STableMeta*   pTableMeta = pTableDataBlock->pTableMeta;