planner: move old cascades file into a limited pkg to avoid import core files.

pkg/planner/BUILD.bazel

@@ -13,7 +13,7 @@ go_library(
         "//pkg/metrics",
         "//pkg/parser/ast",
         "//pkg/parser/model",
-        "//pkg/planner/cascades",
+        "//pkg/planner/cascades/old",
         "//pkg/planner/core",
         "//pkg/planner/core/base",
         "//pkg/planner/core/resolve",

pkg/planner/cascades/BUILD.bazel → pkg/planner/cascades/old/BUILD.bazel

@@ -1,15 +1,15 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
-    name = "cascades",
+    name = "old",
     srcs = [
         "enforcer_rules.go",
         "implementation_rules.go",
         "optimize.go",
         "stringer.go",
         "transformation_rules.go",
     ],
-    importpath = "github.com/pingcap/tidb/pkg/planner/cascades",
+    importpath = "github.com/pingcap/tidb/pkg/planner/cascades/old",
     visibility = ["//visibility:public"],
     deps = [
         "//pkg/expression",
@@ -37,7 +37,7 @@ go_library(
 )
 
 go_test(
-    name = "cascades_test",
+    name = "old_test",
     timeout = "short",
     srcs = [
         "enforcer_rules_test.go",
@@ -47,7 +47,7 @@ go_test(
         "transformation_rules_test.go",
     ],
     data = glob(["testdata/**"]),
-    embed = [":cascades"],
+    embed = [":old"],
     flaky = True,
     shard_count = 25,
     deps = [

pkg/planner/cascades/enforcer_rules.go → pkg/planner/cascades/old/enforcer_rules.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"math"

pkg/planner/cascades/enforcer_rules_test.go → pkg/planner/cascades/old/enforcer_rules_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"testing"

pkg/planner/cascades/implementation_rules.go → pkg/planner/cascades/old/implementation_rules.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"math"

pkg/planner/cascades/main_test.go → pkg/planner/cascades/old/main_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"flag"

pkg/planner/cascades/optimize.go → pkg/planner/cascades/old/optimize.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"container/list"

pkg/planner/cascades/optimize_test.go → pkg/planner/cascades/old/optimize_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"context"

pkg/planner/cascades/stringer.go → pkg/planner/cascades/old/stringer.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"bytes"

pkg/planner/cascades/stringer_test.go → pkg/planner/cascades/old/stringer_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"context"

pkg/planner/cascades/transformation_rules.go → pkg/planner/cascades/old/transformation_rules.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"math"

pkg/planner/cascades/transformation_rules_test.go → pkg/planner/cascades/old/transformation_rules_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package cascades
+package old
 
 import (
 	"context"

pkg/planner/optimize.go

@@ -30,7 +30,7 @@ import (
 	"github.com/pingcap/tidb/pkg/metrics"
 	"github.com/pingcap/tidb/pkg/parser/ast"
 	"github.com/pingcap/tidb/pkg/parser/model"
-	"github.com/pingcap/tidb/pkg/planner/cascades"
+	"github.com/pingcap/tidb/pkg/planner/cascades/old"
 	"github.com/pingcap/tidb/pkg/planner/core"
 	"github.com/pingcap/tidb/pkg/planner/core/base"
 	"github.com/pingcap/tidb/pkg/planner/core/resolve"
@@ -521,7 +521,7 @@ func optimize(ctx context.Context, sctx planctx.PlanContext, node *resolve.NodeW
 
 	// Handle the logical plan statement, use cascades planner if enabled.
 	if sessVars.GetEnableCascadesPlanner() {
-		finalPlan, cost, err := cascades.DefaultOptimizer.FindBestPlan(sctx, logic)
+		finalPlan, cost, err := old.DefaultOptimizer.FindBestPlan(sctx, logic)
 		return finalPlan, names, cost, err
 	}