From a4ce627529ba529d8825876cb5773a8972bfbc0f Mon Sep 17 00:00:00 2001
From: tsthght <781181214@qq.com>
Date: Thu, 17 Oct 2019 19:39:48 +0800
Subject: [PATCH] expression: implement vectorized evaluation for
 'builtinCastJSONAsJSONSig' (#12794)

---
 expression/builtin_cast_vec.go      | 4 ++--
 expression/builtin_cast_vec_test.go | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/expression/builtin_cast_vec.go b/expression/builtin_cast_vec.go
index dc77da13181fb..2e8f7a87bbfb2 100644
--- a/expression/builtin_cast_vec.go
+++ b/expression/builtin_cast_vec.go
@@ -582,11 +582,11 @@ func (b *builtinCastIntAsJSONSig) vecEvalJSON(input *chunk.Chunk, result *chunk.
 }
 
 func (b *builtinCastJSONAsJSONSig) vectorized() bool {
-	return false
+	return true
 }
 
 func (b *builtinCastJSONAsJSONSig) vecEvalJSON(input *chunk.Chunk, result *chunk.Column) error {
-	return errors.Errorf("not implemented")
+	return b.args[0].VecEvalJSON(b.ctx, input, result)
 }
 
 func (b *builtinCastJSONAsStringSig) vectorized() bool {
diff --git a/expression/builtin_cast_vec_test.go b/expression/builtin_cast_vec_test.go
index 83718df96cc7e..484c4dccdc604 100644
--- a/expression/builtin_cast_vec_test.go
+++ b/expression/builtin_cast_vec_test.go
@@ -50,6 +50,7 @@ var vecBuiltinCastCases = map[string][]vecExprBenchCase{
 		{retEvalType: types.ETDuration, childrenTypes: []types.EvalType{types.ETDuration}},
 		{retEvalType: types.ETJson, childrenTypes: []types.EvalType{types.ETInt}},
 		{retEvalType: types.ETJson, childrenTypes: []types.EvalType{types.ETReal}},
+		{retEvalType: types.ETJson, childrenTypes: []types.EvalType{types.ETJson}},
 	},
 }