From 8fb10934d015c28cfb4843f36474ecbbba2d8630 Mon Sep 17 00:00:00 2001
From: Zhang Zhiyi <909645105@qq.com>
Date: Mon, 11 Nov 2019 15:42:13 +0800
Subject: [PATCH] expression: implement vectorized evaluation for
 `builtinHexIntArgSig` (#13330)

---
 expression/builtin_string_vec.go      | 22 ++++++++++++++++++++--
 expression/builtin_string_vec_test.go |  1 +
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/expression/builtin_string_vec.go b/expression/builtin_string_vec.go
index 6cbb4cf7d7824..e6eed321a320e 100644
--- a/expression/builtin_string_vec.go
+++ b/expression/builtin_string_vec.go
@@ -1808,11 +1808,29 @@ func (b *builtinSubstringBinary3ArgsSig) vecEvalString(input *chunk.Chunk, resul
 }
 
 func (b *builtinHexIntArgSig) vectorized() bool {
-	return false
+	return true
 }
 
 func (b *builtinHexIntArgSig) vecEvalString(input *chunk.Chunk, result *chunk.Column) error {
-	return errors.Errorf("not implemented")
+	n := input.NumRows()
+	buf, err := b.bufAllocator.get(types.ETInt, n)
+	if err != nil {
+		return err
+	}
+	defer b.bufAllocator.put(buf)
+	if err := b.args[0].VecEvalInt(b.ctx, input, buf); err != nil {
+		return err
+	}
+	result.ReserveString(n)
+	i64s := buf.Int64s()
+	for i := 0; i < n; i++ {
+		if buf.IsNull(i) {
+			result.AppendNull()
+			continue
+		}
+		result.AppendString(strings.ToUpper(fmt.Sprintf("%x", uint64(i64s[i]))))
+	}
+	return nil
 }
 
 func (b *builtinFieldIntSig) vectorized() bool {
diff --git a/expression/builtin_string_vec_test.go b/expression/builtin_string_vec_test.go
index b18004fc46910..3c18a6414a5f7 100644
--- a/expression/builtin_string_vec_test.go
+++ b/expression/builtin_string_vec_test.go
@@ -102,6 +102,7 @@ var vecBuiltinStringCases = map[string][]vecExprBenchCase{
 	},
 	ast.Hex: {
 		{retEvalType: types.ETString, childrenTypes: []types.EvalType{types.ETString}, geners: []dataGenerator{&randHexStrGener{10, 100}}},
+		{retEvalType: types.ETString, childrenTypes: []types.EvalType{types.ETInt}},
 	},
 	ast.Unhex: {
 		{retEvalType: types.ETString, childrenTypes: []types.EvalType{types.ETString}, geners: []dataGenerator{&randHexStrGener{10, 100}}},