90 lines
3.0 KiB
Go
90 lines
3.0 KiB
Go
// Copyright 2023 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 expression
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/pingcap/tidb/pkg/errctx"
|
|
"github.com/pingcap/tidb/pkg/kv"
|
|
"github.com/pingcap/tidb/pkg/parser/mysql"
|
|
"github.com/pingcap/tidb/pkg/sessionctx"
|
|
"github.com/pingcap/tidb/pkg/sessionctx/stmtctx"
|
|
"github.com/pingcap/tidb/pkg/sessionctx/variable"
|
|
"github.com/pingcap/tidb/pkg/types"
|
|
)
|
|
|
|
// EvalContext is used to evaluate an expression
|
|
type EvalContext interface {
|
|
// GetSessionVars gets the session variables.
|
|
GetSessionVars() *variable.SessionVars
|
|
// Value returns the value associated with this context for key.
|
|
Value(key fmt.Stringer) any
|
|
// IsDDLOwner checks whether this session is DDL owner.
|
|
IsDDLOwner() bool
|
|
// GetAdvisoryLock acquires an advisory lock (aka GET_LOCK()).
|
|
GetAdvisoryLock(string, int64) error
|
|
// IsUsedAdvisoryLock checks for existing locks (aka IS_USED_LOCK()).
|
|
IsUsedAdvisoryLock(string) uint64
|
|
// ReleaseAdvisoryLock releases an advisory lock (aka RELEASE_LOCK()).
|
|
ReleaseAdvisoryLock(string) bool
|
|
// ReleaseAllAdvisoryLocks releases all advisory locks that this session holds.
|
|
ReleaseAllAdvisoryLocks() int
|
|
// GetStore returns the store of session.
|
|
GetStore() kv.Storage
|
|
// GetInfoSchema returns the current infoschema
|
|
GetInfoSchema() sessionctx.InfoschemaMetaVersion
|
|
// GetDomainInfoSchema returns the latest information schema in domain
|
|
GetDomainInfoSchema() sessionctx.InfoschemaMetaVersion
|
|
}
|
|
|
|
func sqlMode(ctx EvalContext) mysql.SQLMode {
|
|
return ctx.GetSessionVars().SQLMode
|
|
}
|
|
|
|
func typeCtx(ctx EvalContext) types.Context {
|
|
return ctx.GetSessionVars().StmtCtx.TypeCtx()
|
|
}
|
|
|
|
func errCtx(ctx EvalContext) errctx.Context {
|
|
return ctx.GetSessionVars().StmtCtx.ErrCtx()
|
|
}
|
|
|
|
func location(ctx EvalContext) *time.Location {
|
|
tc := ctx.GetSessionVars().StmtCtx.TypeCtx()
|
|
return tc.Location()
|
|
}
|
|
|
|
func warningCount(ctx EvalContext) int {
|
|
return int(ctx.GetSessionVars().StmtCtx.WarningCount())
|
|
}
|
|
|
|
func truncateWarnings(ctx EvalContext, start int) []stmtctx.SQLWarn {
|
|
return ctx.GetSessionVars().StmtCtx.TruncateWarnings(start)
|
|
}
|
|
|
|
// BuildContext is used to build an expression
|
|
type BuildContext interface {
|
|
EvalContext
|
|
// GetSessionVars gets the session variables.
|
|
GetSessionVars() *variable.SessionVars
|
|
// SetValue saves a value associated with this context for key.
|
|
SetValue(key fmt.Stringer, value interface{})
|
|
// BuiltinFunctionUsageInc increase the counting of each builtin function usage
|
|
// Notice that this is a thread safe function
|
|
BuiltinFunctionUsageInc(scalarFuncSigName string)
|
|
}
|