63c4562c27
* *: remove non-prepared plan cache non-prepared plan cache is not usable if we can only do full string match. And further development doesn't worth the effort.
92 lines
2.7 KiB
Go
92 lines
2.7 KiB
Go
// Copyright 2017 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 plan
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import (
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"time"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/sessionctx/variable"
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"github.com/pingcap/tidb/util/codec"
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"github.com/pingcap/tidb/util/hack"
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"github.com/pingcap/tidb/util/kvcache"
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)
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var (
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// PreparedPlanCacheEnabled stores the global config "prepared-plan-cache-enabled".
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PreparedPlanCacheEnabled bool
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// PreparedPlanCacheCapacity stores the global config "prepared-plan-cache-capacity".
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PreparedPlanCacheCapacity uint
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)
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type pstmtPlanCacheKey struct {
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database string
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connID uint64
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pstmtID uint32
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snapshot uint64
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schemaVersion int64
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sqlMode mysql.SQLMode
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timezoneOffset int
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hash []byte
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}
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// Hash implements Key interface.
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func (key *pstmtPlanCacheKey) Hash() []byte {
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if key.hash == nil {
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var (
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dbBytes = hack.Slice(key.database)
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bufferSize = len(dbBytes) + 8*6
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)
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key.hash = make([]byte, 0, bufferSize)
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key.hash = append(key.hash, dbBytes...)
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key.hash = codec.EncodeInt(key.hash, int64(key.connID))
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key.hash = codec.EncodeInt(key.hash, int64(key.pstmtID))
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key.hash = codec.EncodeInt(key.hash, int64(key.snapshot))
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key.hash = codec.EncodeInt(key.hash, key.schemaVersion)
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key.hash = codec.EncodeInt(key.hash, int64(key.sqlMode))
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key.hash = codec.EncodeInt(key.hash, int64(key.timezoneOffset))
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}
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return key.hash
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}
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// NewPSTMTPlanCacheKey creates a new pstmtPlanCacheKey object.
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func NewPSTMTPlanCacheKey(sessionVars *variable.SessionVars, pstmtID uint32, schemaVersion int64) kvcache.Key {
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timezoneOffset := 0
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if sessionVars.TimeZone != nil {
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_, timezoneOffset = time.Now().In(sessionVars.TimeZone).Zone()
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}
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return &pstmtPlanCacheKey{
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database: sessionVars.CurrentDB,
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connID: sessionVars.ConnectionID,
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pstmtID: pstmtID,
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snapshot: sessionVars.SnapshotTS,
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schemaVersion: schemaVersion,
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sqlMode: sessionVars.SQLMode,
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timezoneOffset: timezoneOffset,
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}
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}
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// PSTMTPlanCacheValue stores the cached Statement and StmtNode.
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type PSTMTPlanCacheValue struct {
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Plan Plan
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}
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// NewPSTMTPlanCacheValue creates a SQLCacheValue.
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func NewPSTMTPlanCacheValue(plan Plan) *PSTMTPlanCacheValue {
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return &PSTMTPlanCacheValue{
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Plan: plan,
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}
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}
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