tidb opt_rule_blacklist 源码
tidb opt_rule_blacklist 代码
文件路径：/executor/opt_rule_blacklist.go
// Copyright 2019 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package executor
import (
"context"
"github.com/pingcap/tidb/kv"
plannercore "github.com/pingcap/tidb/planner/core"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/util/chunk"
"github.com/pingcap/tidb/util/set"
"github.com/pingcap/tidb/util/sqlexec"
)
// ReloadOptRuleBlacklistExec indicates ReloadOptRuleBlacklist executor.
type ReloadOptRuleBlacklistExec struct {
baseExecutor
}
// Next implements the Executor Next interface.
func (e *ReloadOptRuleBlacklistExec) Next(ctx context.Context, _ *chunk.Chunk) error {
internalCtx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnPrivilege)
return LoadOptRuleBlacklist(internalCtx, e.ctx)
}
// LoadOptRuleBlacklist loads the latest data from table mysql.opt_rule_blacklist.
func LoadOptRuleBlacklist(ctx context.Context, sctx sessionctx.Context) (err error) {
exec := sctx.(sqlexec.RestrictedSQLExecutor)
rows, _, err := exec.ExecRestrictedSQL(ctx, nil, "select HIGH_PRIORITY name from mysql.opt_rule_blacklist")
if err != nil {
return err
}
newDisabledLogicalRules := set.NewStringSet()
for _, row := range rows {
name := row.GetString(0)
newDisabledLogicalRules.Insert(name)
}
plannercore.DefaultDisabledLogicalRulesList.Store(newDisabledLogicalRules)
return nil
}
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