From a8f575409dc95f6909801cb16e62f939d73351e7 Mon Sep 17 00:00:00 2001
From: obdev <obdev@oceanbase.com>
Date: Wed, 29 Jun 2022 11:03:13 +0800
Subject: [PATCH] [CP] [bugfix] Fix bug that json convert to string without
 setting result length

---
 src/sql/engine/expr/ob_expr_cast.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/sql/engine/expr/ob_expr_cast.cpp b/src/sql/engine/expr/ob_expr_cast.cpp
index 3ada54ff92..ed2911f9c1 100644
--- a/src/sql/engine/expr/ob_expr_cast.cpp
+++ b/src/sql/engine/expr/ob_expr_cast.cpp
@@ -143,7 +143,8 @@ int ObExprCast::get_cast_string_len(ObExprResType& type1, ObExprResType& type2,
       case ObEnumInnerType:
       case ObSetInnerType:
       case ObURowIDType:
-      case ObLobType: {
+      case ObLobType:
+      case ObJsonType: {
         res_len = type1.get_length();
         length_semantics = type1.get_length_semantics();
         break;
-- 
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