diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 77ceabbd63..3227102559 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -7519,7 +7519,8 @@ static void doSetTagValueToResultBuf(char* output, const char* val, int16_t type
   if (IS_VAR_DATA_TYPE(type)) {
     // Binary data overflows for sort of unknown reasons. Let trim the overflow data
     if (varDataTLen(val) > bytes) {
-      int32_t len = bytes - VARSTR_HEADER_SIZE;   // remain available space
+      int32_t maxLen = bytes - VARSTR_HEADER_SIZE;
+      int32_t len = (varDataLen(val) > maxLen)? maxLen:varDataLen(val);
       memcpy(varDataVal(output), varDataVal(val), len);
       varDataSetLen(output, len);
     } else {
diff --git a/src/tsdb/src/tsdbMeta.c b/src/tsdb/src/tsdbMeta.c
index 86e3aea4b5..17223c99fe 100644
--- a/src/tsdb/src/tsdbMeta.c
+++ b/src/tsdb/src/tsdbMeta.c
@@ -211,7 +211,7 @@ void *tsdbGetTableTagVal(const void* pTable, int32_t colId, int16_t type, int16_
   }
 
   char *val = tdGetKVRowValOfCol(((STable*)pTable)->tagVal, colId);
-  assert(type == pCol->type && bytes == pCol->bytes);
+  assert(type == pCol->type && bytes >= pCol->bytes);
 
   // if (val != NULL && IS_VAR_DATA_TYPE(type)) {
   //   assert(varDataLen(val) < pCol->bytes);