fix null case for GetJsonLength (#3734) (#3737)

close #2705
pingcap · Apr 14, 2022 · d35821a · d35821a
1 parent ea72b21
commit d35821a
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/dbms/src/Storages/Transaction/JSONCodec.cpp b/dbms/src/Storages/Transaction/JSONCodec.cpp
@@ -61,7 +61,6 @@
  */
 namespace DB
 {
-
 namespace ErrorCodes
 {
 extern const int LOGICAL_ERROR;
@@ -277,6 +276,10 @@ String DecodeJsonAsBinary(size_t & cursor, const String & raw_value) { return De
 
 UInt64 GetJsonLength(std::string_view raw_value)
 {
+    if (raw_value.empty())
+    {
+        return 0;
+    }
     switch (raw_value[0]) // JSON Root element type
     {
         case TYPE_CODE_OBJECT: