expression:implement vectorized evaluation for builtinUnixTimestampCurrentSig (#13510)

expression/builtin_time_vec.go

@@ -436,11 +436,27 @@ func (b *builtinSubDateIntIntSig) vecEvalTime(input *chunk.Chunk, result *chunk.
 }
 
 func (b *builtinUnixTimestampCurrentSig) vectorized() bool {
-	return false
+	return true
 }
 
 func (b *builtinUnixTimestampCurrentSig) vecEvalInt(input *chunk.Chunk, result *chunk.Column) error {
-	return errors.Errorf("not implemented")
+	nowTs, err := getStmtTimestamp(b.ctx)
+	if err != nil {
+		return err
+	}
+	dec, err := goTimeToMysqlUnixTimestamp(nowTs, 1)
+	if err != nil {
+		return err
+	}
+	intVal, err := dec.ToInt()
+	terror.Log(err)
+	n := input.NumRows()
+	result.ResizeInt64(n, false)
+	intRes := result.Int64s()
+	for i := 0; i < n; i++ {
+		intRes[i] = intVal
+	}
+	return nil
 }
 
 func (b *builtinSubDateIntRealSig) vectorized() bool {

expression/builtin_time_vec_test.go

@@ -209,6 +209,9 @@ var vecBuiltinTimeCases = map[string][]vecExprBenchCase{
 		{retEvalType: types.ETTimestamp},
 		{retEvalType: types.ETTimestamp, childrenTypes: []types.EvalType{types.ETInt}, geners: []dataGenerator{&rangeInt64Gener{begin: 0, end: 7}}},
 	},
+	ast.UnixTimestamp: {
+		{retEvalType: types.ETInt},
+	},
 	ast.UTCTime: {
 		{retEvalType: types.ETDuration},
 		{retEvalType: types.ETDuration, childrenTypes: []types.EvalType{types.ETInt}, geners: []dataGenerator{&rangeInt64Gener{begin: 0, end: 7}}},