54 lines
1.6 KiB
Go
54 lines
1.6 KiB
Go
// Copyright 2023 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 lockstats
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import (
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"github.com/pingcap/tidb/pkg/sessionctx"
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"github.com/pingcap/tidb/pkg/statistics/handle/util"
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)
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const selectSQL = "SELECT table_id FROM mysql.stats_table_locked"
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// QueryLockedTables loads locked tables from mysql.stats_table_locked.
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// Return it as a map for fast query.
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func QueryLockedTables(sctx sessionctx.Context) (map[int64]struct{}, error) {
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rows, _, err := util.ExecRows(sctx, selectSQL)
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if err != nil {
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return nil, err
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}
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tableLocked := make(map[int64]struct{}, len(rows))
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for _, row := range rows {
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tableLocked[row.GetInt64(0)] = struct{}{}
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}
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return tableLocked, nil
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}
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// GetLockedTables returns the locked status of the given tables.
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func GetLockedTables(tableLocked map[int64]struct{}, tableIDs ...int64) map[int64]struct{} {
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lockedTables := make(map[int64]struct{}, len(tableLocked))
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if len(tableLocked) == 0 {
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return lockedTables
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}
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for _, tid := range tableIDs {
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if _, ok := tableLocked[tid]; ok {
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lockedTables[tid] = struct{}{}
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continue
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}
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}
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return lockedTables
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}
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