50 lines
1.6 KiB
Go
50 lines
1.6 KiB
Go
// Copyright 2019 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package executor
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import (
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"context"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/util/chunk"
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"github.com/pingcap/tidb/util/sqlexec"
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)
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// ReloadExprPushdownBlacklistExec indicates ReloadExprPushdownBlacklist executor.
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type ReloadExprPushdownBlacklistExec struct {
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baseExecutor
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}
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// Next implements the Executor Next interface.
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func (e *ReloadExprPushdownBlacklistExec) Next(ctx context.Context, _ *chunk.Chunk) error {
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return LoadExprPushdownBlacklist(e.ctx)
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}
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// LoadExprPushdownBlacklist loads the latest data from table mysql.expr_pushdown_blacklist.
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func LoadExprPushdownBlacklist(ctx sessionctx.Context) (err error) {
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sql := "select HIGH_PRIORITY name from mysql.expr_pushdown_blacklist"
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rows, _, err := ctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(ctx, sql)
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if err != nil {
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return err
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}
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newBlacklist := make(map[string]struct{})
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for _, row := range rows {
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name := row.GetString(0)
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newBlacklist[name] = struct{}{}
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}
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expression.DefaultExprPushdownBlacklist.Store(newBlacklist)
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return nil
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}
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