expression: implement vectorized evaluation for builtinCastIntAsDurationSig

expression/bench_test.go

@@ -288,6 +288,12 @@ func (g *randLenStrGener) gen() interface{} {
 	return string(buf)
 }
 
+type randDurInt struct{}
+
+func (g *randDurInt) gen() interface{} {
+	return int64(rand.Intn(types.TimeMaxHour)*10000 + rand.Intn(60)*100 + rand.Intn(60))
+}
+
 type vecExprBenchCase struct {
 	retEvalType   types.EvalType
 	childrenTypes []types.EvalType

expression/builtin_cast_vec.go

@@ -15,9 +15,49 @@ package expression
 
 import (
 	"github.com/pingcap/parser/mysql"
+	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/util/chunk"
 )
 
+func (b *builtinCastIntAsDurationSig) vecEvalDuration(input *chunk.Chunk, result *chunk.Column) error {
+	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.ResizeGoDuration(n, false)
+	result.MergeNulls(buf)
+	i64s := buf.Int64s()
+	ds := result.GoDurations()
+	for i := 0; i < n; i++ {
+		if result.IsNull(i) {
+			continue
+		}
+		dur, err := types.NumberToDuration(i64s[i], int8(b.tp.Decimal))
+		if err != nil {
+			if types.ErrOverflow.Equal(err) {
+				err = b.ctx.GetSessionVars().StmtCtx.HandleOverflow(err, err)
+			}
+			if err != nil {
+				return err
+			}
+			result.SetNull(i, true)
+			continue
+		}
+		ds[i] = dur.Duration
+	}
+	return nil
+}
+
+func (b *builtinCastIntAsDurationSig) vectorized() bool {
+	return true
+}
+
 func (b *builtinCastIntAsIntSig) vecEvalInt(input *chunk.Chunk, result *chunk.Column) error {
 	if err := b.args[0].VecEvalInt(b.ctx, input, result); err != nil {
 		return err

expression/builtin_cast_vec_test.go

@@ -24,6 +24,7 @@ import (
 var vecBuiltinCastCases = map[string][]vecExprBenchCase{
 	ast.Cast: {
 		{types.ETInt, []types.EvalType{types.ETInt}, nil},
+		{types.ETDuration, []types.EvalType{types.ETInt}, []dataGenerator{new(randDurInt)}},
 	},
 }