test patch cluster support for scan operation

Author: ns-ofang

generic_commands.go

@@ -3,6 +3,8 @@ package redis
 import (
 	"context"
 	"time"
+
+	"github.com/redis/go-redis/v9/internal/hashtag"
 )
 
 type GenericCmdable interface {
@@ -363,6 +365,9 @@ func (c cmdable) Scan(ctx context.Context, cursor uint64, match string, count in
 		args = append(args, "count", count)
 	}
 	cmd := NewScanCmd(ctx, c, args...)
+	if hashtag.Present(match) {
+		cmd.SetFirstKeyPos(3)
+	}
 	_ = c(ctx, cmd)
 	return cmd
 }

internal/hashtag/hashtag.go

@@ -56,6 +56,18 @@ func Key(key string) string {
 	return key
 }
 
+func Present(key string) bool {
+	if key == "" {
+		return false
+	}
+	if s := strings.IndexByte(key, '{'); s > -1 {
+		if e := strings.IndexByte(key[s+1:], '}'); e > 0 {
+			return true
+		}
+	}
+	return false
+}
+
 func RandomSlot() int {
 	return rand.Intn(slotNumber)
 }