Removes split-by upstream validation (#5087)

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

pkg/querier/queryrange/roundtrip.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/cortexproject/cortex/pkg/querier/queryrange"
 	"github.com/go-kit/log"
+	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/prometheus/model/labels"
 	"github.com/weaveworks/common/httpgrpc"
@@ -30,6 +31,16 @@ func (cfg *Config) RegisterFlags(f *flag.FlagSet) {
 	cfg.Config.RegisterFlags(f)
 }
 
+// Validate validates the config.
+func (cfg *Config) Validate() error {
+	if cfg.CacheResults {
+		if err := cfg.ResultsCacheConfig.Validate(); err != nil {
+			return errors.Wrap(err, "invalid ResultsCache config")
+		}
+	}
+	return nil
+}
+
 // Stopper gracefully shutdown resources created
 type Stopper interface {
 	Stop()