48 lines
1.8 KiB
Go
48 lines
1.8 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 expression
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import (
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"fmt"
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"github.com/pingcap/tidb/pkg/kv"
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"github.com/pingcap/tidb/pkg/sessionctx"
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"github.com/pingcap/tidb/pkg/sessionctx/variable"
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)
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// EvalContext is used to evaluate an expression
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type EvalContext interface {
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// GetSessionVars gets the session variables.
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GetSessionVars() *variable.SessionVars
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// Value returns the value associated with this context for key.
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Value(key fmt.Stringer) interface{}
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// IsDDLOwner checks whether this session is DDL owner.
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IsDDLOwner() bool
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// GetAdvisoryLock acquires an advisory lock (aka GET_LOCK()).
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GetAdvisoryLock(string, int64) error
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// IsUsedAdvisoryLock checks for existing locks (aka IS_USED_LOCK()).
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IsUsedAdvisoryLock(string) uint64
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// ReleaseAdvisoryLock releases an advisory lock (aka RELEASE_LOCK()).
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ReleaseAdvisoryLock(string) bool
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// ReleaseAllAdvisoryLocks releases all advisory locks that this session holds.
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ReleaseAllAdvisoryLocks() int
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// GetStore returns the store of session.
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GetStore() kv.Storage
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// GetInfoSchema returns the current infoschema
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GetInfoSchema() sessionctx.InfoschemaMetaVersion
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// GetDomainInfoSchema returns the latest information schema in domain
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GetDomainInfoSchema() sessionctx.InfoschemaMetaVersion
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}
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