diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 9af6e0b8e64fa56b8136892b1a066ff55b549826..5ecddb79100ff476f9c9026a80fa7167f4e551ac 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -3364,7 +3364,14 @@ static int32_t doExtractColumnFilterInfo(SSqlCmd* pCmd, SQueryInfo* pQueryInfo,
   if (IS_NUMERIC_TYPE(pRight->value.nType)) {
     bufLen = 60;
   } else {
-    bufLen = pRight->value.nLen + 1;
+    /*
+     * make memory sanitizer happy;
+     */
+    if (pRight->value.nLen == 0) {
+      bufLen = pRight->value.nLen + 2; 
+    } else {
+      bufLen = pRight->value.nLen + 1; 
+    }
   }
 
   if (pExpr->tokenId == TK_LE || pExpr->tokenId == TK_LT) {