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builtin_info.go
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builtin_info.go
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// Copyright 2013 The ql Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSES/QL-LICENSE file.
// Copyright 2015 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package expression
import (
"github.com/juju/errors"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/printer"
)
var (
_ functionClass = &databaseFunctionClass{}
_ functionClass = &foundRowsFunctionClass{}
_ functionClass = ¤tUserFunctionClass{}
_ functionClass = &userFunctionClass{}
_ functionClass = &connectionIDFunctionClass{}
_ functionClass = &lastInsertIDFunctionClass{}
_ functionClass = &versionFunctionClass{}
_ functionClass = &benchmarkFunctionClass{}
_ functionClass = &charsetFunctionClass{}
_ functionClass = &coercibilityFunctionClass{}
_ functionClass = &collationFunctionClass{}
_ functionClass = &rowCountFunctionClass{}
_ functionClass = &tidbVersionFunctionClass{}
)
var (
_ builtinFunc = &builtinDatabaseSig{}
_ builtinFunc = &builtinFoundRowsSig{}
_ builtinFunc = &builtinCurrentUserSig{}
_ builtinFunc = &builtinUserSig{}
_ builtinFunc = &builtinConnectionIDSig{}
_ builtinFunc = &builtinLastInsertIDSig{}
_ builtinFunc = &builtinLastInsertIDWithIDSig{}
_ builtinFunc = &builtinVersionSig{}
_ builtinFunc = &builtinTiDBVersionSig{}
_ builtinFunc = &builtinRowCountSig{}
)
type databaseFunctionClass struct {
baseFunctionClass
}
func (c *databaseFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, err
}
bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETString)
bf.tp.Flen = 64
sig := &builtinDatabaseSig{bf}
return sig, nil
}
type builtinDatabaseSig struct {
baseBuiltinFunc
}
func (b *builtinDatabaseSig) Clone() builtinFunc {
newSig := &builtinDatabaseSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
// evalString evals a builtinDatabaseSig.
// See https://dev.mysql.com/doc/refman/5.7/en/information-functions.html
func (b *builtinDatabaseSig) evalString(row types.Row) (string, bool, error) {
currentDB := b.ctx.GetSessionVars().CurrentDB
return currentDB, currentDB == "", nil
}
type foundRowsFunctionClass struct {
baseFunctionClass
}
func (c *foundRowsFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, err
}
bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETInt)
bf.tp.Flag |= mysql.UnsignedFlag
sig := &builtinFoundRowsSig{bf}
return sig, nil
}
type builtinFoundRowsSig struct {
baseBuiltinFunc
}
func (b *builtinFoundRowsSig) Clone() builtinFunc {
newSig := &builtinFoundRowsSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
// evalInt evals a builtinFoundRowsSig.
// See https://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_found-rows
// TODO: SQL_CALC_FOUND_ROWS and LIMIT not support for now, We will finish in another PR.
func (b *builtinFoundRowsSig) evalInt(row types.Row) (int64, bool, error) {
data := b.ctx.GetSessionVars()
if data == nil {
return 0, true, errors.Errorf("Missing session variable when eval builtin")
}
return int64(data.LastFoundRows), false, nil
}
type currentUserFunctionClass struct {
baseFunctionClass
}
func (c *currentUserFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETString)
bf.tp.Flen = 64
sig := &builtinCurrentUserSig{bf}
return sig, nil
}
type builtinCurrentUserSig struct {
baseBuiltinFunc
}
func (b *builtinCurrentUserSig) Clone() builtinFunc {
newSig := &builtinCurrentUserSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
// evalString evals a builtinCurrentUserSig.
// See https://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_current-user
// TODO: The value of CURRENT_USER() can differ from the value of USER(). We will finish this after we support grant tables.
func (b *builtinCurrentUserSig) evalString(row types.Row) (string, bool, error) {
data := b.ctx.GetSessionVars()
if data == nil || data.User == nil {
return "", true, errors.Errorf("Missing session variable when eval builtin")
}
return data.User.String(), false, nil
}
type userFunctionClass struct {
baseFunctionClass
}
func (c *userFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, err
}
bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETString)
bf.tp.Flen = 64
sig := &builtinUserSig{bf}
return sig, nil
}
type builtinUserSig struct {
baseBuiltinFunc
}
func (b *builtinUserSig) Clone() builtinFunc {
newSig := &builtinUserSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
// eval evals a builtinUserSig.
// See https://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_user
func (b *builtinUserSig) evalString(row types.Row) (string, bool, error) {
data := b.ctx.GetSessionVars()
if data == nil || data.User == nil {
return "", true, errors.Errorf("Missing session variable when eval builtin")
}
return data.User.String(), false, nil
}
type connectionIDFunctionClass struct {
baseFunctionClass
}
func (c *connectionIDFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, err
}
bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETInt)
bf.tp.Flag |= mysql.UnsignedFlag
sig := &builtinConnectionIDSig{bf}
return sig, nil
}
type builtinConnectionIDSig struct {
baseBuiltinFunc
}
func (b *builtinConnectionIDSig) Clone() builtinFunc {
newSig := &builtinConnectionIDSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinConnectionIDSig) evalInt(_ types.Row) (int64, bool, error) {
data := b.ctx.GetSessionVars()
if data == nil {
return 0, true, errors.Errorf("Missing session variable when evalue builtin")
}
return int64(data.ConnectionID), false, nil
}
type lastInsertIDFunctionClass struct {
baseFunctionClass
}
func (c *lastInsertIDFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {
if err = c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
var argsTp []types.EvalType
if len(args) == 1 {
argsTp = append(argsTp, types.ETInt)
}
bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETInt, argsTp...)
bf.tp.Flag |= mysql.UnsignedFlag
if len(args) == 1 {
sig = &builtinLastInsertIDWithIDSig{bf}
} else {
sig = &builtinLastInsertIDSig{bf}
}
return sig, errors.Trace(err)
}
type builtinLastInsertIDSig struct {
baseBuiltinFunc
}
func (b *builtinLastInsertIDSig) Clone() builtinFunc {
newSig := &builtinLastInsertIDSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
// evalInt evals LAST_INSERT_ID().
// See https://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_last-insert-id.
func (b *builtinLastInsertIDSig) evalInt(row types.Row) (res int64, isNull bool, err error) {
res = int64(b.ctx.GetSessionVars().PrevLastInsertID)
return res, false, nil
}
type builtinLastInsertIDWithIDSig struct {
baseBuiltinFunc
}
func (b *builtinLastInsertIDWithIDSig) Clone() builtinFunc {
newSig := &builtinLastInsertIDWithIDSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
// evalInt evals LAST_INSERT_ID(expr).
// See https://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_last-insert-id.
func (b *builtinLastInsertIDWithIDSig) evalInt(row types.Row) (res int64, isNull bool, err error) {
res, isNull, err = b.args[0].EvalInt(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
b.ctx.GetSessionVars().SetLastInsertID(uint64(res))
return res, false, nil
}
type versionFunctionClass struct {
baseFunctionClass
}
func (c *versionFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, err
}
bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETString)
bf.tp.Flen = 64
sig := &builtinVersionSig{bf}
return sig, nil
}
type builtinVersionSig struct {
baseBuiltinFunc
}
func (b *builtinVersionSig) Clone() builtinFunc {
newSig := &builtinVersionSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
// evalString evals a builtinVersionSig.
// See https://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_version
func (b *builtinVersionSig) evalString(row types.Row) (string, bool, error) {
return mysql.ServerVersion, false, nil
}
type tidbVersionFunctionClass struct {
baseFunctionClass
}
func (c *tidbVersionFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETString)
bf.tp.Flen = len(printer.GetTiDBInfo())
sig := &builtinTiDBVersionSig{bf}
return sig, nil
}
type builtinTiDBVersionSig struct {
baseBuiltinFunc
}
func (b *builtinTiDBVersionSig) Clone() builtinFunc {
newSig := &builtinTiDBVersionSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
// evalString evals a builtinTiDBVersionSig.
// This will show git hash and build time for tidb-server.
func (b *builtinTiDBVersionSig) evalString(_ types.Row) (string, bool, error) {
return printer.GetTiDBInfo(), false, nil
}
type benchmarkFunctionClass struct {
baseFunctionClass
}
func (c *benchmarkFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
return nil, errFunctionNotExists.GenByArgs("FUNCTION", "BENCHMARK")
}
type charsetFunctionClass struct {
baseFunctionClass
}
func (c *charsetFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
return nil, errFunctionNotExists.GenByArgs("FUNCTION", "CHARSET")
}
type coercibilityFunctionClass struct {
baseFunctionClass
}
func (c *coercibilityFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
return nil, errFunctionNotExists.GenByArgs("FUNCTION", "COERCIBILITY")
}
type collationFunctionClass struct {
baseFunctionClass
}
func (c *collationFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
return nil, errFunctionNotExists.GenByArgs("FUNCTION", "COLLATION")
}
type rowCountFunctionClass struct {
baseFunctionClass
}
func (c *rowCountFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {
if err = c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETInt)
sig = &builtinRowCountSig{bf}
return sig, nil
}
type builtinRowCountSig struct {
baseBuiltinFunc
}
func (b *builtinRowCountSig) Clone() builtinFunc {
newSig := &builtinRowCountSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
// evalInt evals ROW_COUNT().
// See https://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_row-count.
func (b *builtinRowCountSig) evalInt(_ types.Row) (res int64, isNull bool, err error) {
res = int64(b.ctx.GetSessionVars().PrevAffectedRows)
return res, false, nil
}