/
builtin_other.go
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/
builtin_other.go
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// Copyright 2016 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 (
"strings"
"time"
"github.com/juju/errors"
"github.com/ducminhnguyen/gleam/sql/context"
"github.com/ducminhnguyen/gleam/sql/mysql"
"github.com/ducminhnguyen/gleam/sql/util/types"
)
var (
_ functionClass = &sleepFunctionClass{}
_ functionClass = &inFunctionClass{}
_ functionClass = &rowFunctionClass{}
_ functionClass = &castFunctionClass{}
_ functionClass = &setVarFunctionClass{}
_ functionClass = &getVarFunctionClass{}
_ functionClass = &lockFunctionClass{}
_ functionClass = &releaseLockFunctionClass{}
_ functionClass = &valuesFunctionClass{}
)
var (
_ builtinFunc = &builtinSleepSig{}
_ builtinFunc = &builtinInSig{}
_ builtinFunc = &builtinRowSig{}
_ builtinFunc = &builtinCastSig{}
_ builtinFunc = &builtinSetVarSig{}
_ builtinFunc = &builtinGetVarSig{}
_ builtinFunc = &builtinLockSig{}
_ builtinFunc = &builtinReleaseLockSig{}
_ builtinFunc = &builtinValuesSig{}
)
type sleepFunctionClass struct {
baseFunctionClass
}
func (c *sleepFunctionClass) getFunction(args []Expression, ctx context.Context) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, errors.Trace(err)
}
bt := &builtinSleepSig{newBaseBuiltinFunc(args, ctx)}
bt.deterministic = false
return bt, nil
}
type builtinSleepSig struct {
baseBuiltinFunc
}
func (b *builtinSleepSig) eval(row []types.Datum) (types.Datum, error) {
args, err := b.evalArgs(row)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
return builtinSleep(args, b.ctx)
}
// See http://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html#function_sleep
func builtinSleep(args []types.Datum, ctx context.Context) (d types.Datum, err error) {
sessVars := ctx.GetSessionVars()
if args[0].IsNull() {
if sessVars.StrictSQLMode {
return d, errors.New("incorrect arguments to sleep")
}
d.SetInt64(0)
return
}
// processing argument is negative
zero := types.NewIntDatum(0)
sc := sessVars.StmtCtx
ret, err := args[0].CompareDatum(sc, zero)
if err != nil {
return d, errors.Trace(err)
}
if ret == -1 {
if sessVars.StrictSQLMode {
return d, errors.New("incorrect arguments to sleep")
}
d.SetInt64(0)
return
}
// TODO: consider it's interrupted using KILL QUERY from other session, or
// interrupted by time out.
duration := time.Duration(args[0].GetFloat64() * float64(time.Second.Nanoseconds()))
time.Sleep(duration)
d.SetInt64(0)
return
}
type inFunctionClass struct {
baseFunctionClass
}
func (c *inFunctionClass) getFunction(args []Expression, ctx context.Context) (builtinFunc, error) {
return &builtinInSig{newBaseBuiltinFunc(args, ctx)}, errors.Trace(c.verifyArgs(args))
}
type builtinInSig struct {
baseBuiltinFunc
}
func (b *builtinInSig) eval(row []types.Datum) (types.Datum, error) {
args, err := b.evalArgs(row)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
return builtinIn(args, b.ctx)
}
// See http://dev.mysql.com/doc/refman/5.7/en/any-in-some-subqueries.html
func builtinIn(args []types.Datum, ctx context.Context) (d types.Datum, err error) {
if args[0].IsNull() {
return
}
sc := ctx.GetSessionVars().StmtCtx
var hasNull bool
for _, v := range args[1:] {
if v.IsNull() {
hasNull = true
continue
}
a, b, err := types.CoerceDatum(sc, args[0], v)
if err != nil {
return d, errors.Trace(err)
}
ret, err := a.CompareDatum(sc, b)
if err != nil {
return d, errors.Trace(err)
}
if ret == 0 {
d.SetInt64(1)
return d, nil
}
}
if hasNull {
// If it's no matched but we get null in In, returns null.
// e.g 1 in (null, 2, 3) returns null.
return
}
d.SetInt64(0)
return
}
type rowFunctionClass struct {
baseFunctionClass
}
func (c *rowFunctionClass) getFunction(args []Expression, ctx context.Context) (builtinFunc, error) {
return &builtinRowSig{newBaseBuiltinFunc(args, ctx)}, errors.Trace(c.verifyArgs(args))
}
type builtinRowSig struct {
baseBuiltinFunc
}
func (b *builtinRowSig) eval(row []types.Datum) (types.Datum, error) {
args, err := b.evalArgs(row)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
return builtinRow(args, b.ctx)
}
func builtinRow(row []types.Datum, _ context.Context) (d types.Datum, err error) {
d.SetRow(row)
return
}
type castFunctionClass struct {
baseFunctionClass
tp *types.FieldType
}
func (c *castFunctionClass) getFunction(args []Expression, ctx context.Context) (builtinFunc, error) {
return &builtinCastSig{newBaseBuiltinFunc(args, ctx), c.tp}, errors.Trace(c.verifyArgs(args))
}
type builtinCastSig struct {
baseBuiltinFunc
tp *types.FieldType
}
func (b *builtinCastSig) eval(row []types.Datum) (types.Datum, error) {
args, err := b.evalArgs(row)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
f, err := CastFuncFactory(b.tp)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
return f(args, b.ctx)
}
// CastFuncFactory produces builtin function according to field types.
// See https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html
func CastFuncFactory(tp *types.FieldType) (BuiltinFunc, error) {
switch tp.Tp {
// Parser has restricted this.
case mysql.TypeString, mysql.TypeDuration, mysql.TypeDatetime,
mysql.TypeDate, mysql.TypeLonglong, mysql.TypeNewDecimal:
return func(args []types.Datum, ctx context.Context) (d types.Datum, err error) {
d = args[0]
if d.IsNull() {
return
}
return d.ConvertTo(ctx.GetSessionVars().StmtCtx, tp)
}, nil
}
return nil, errors.Errorf("unknown cast type - %v", tp)
}
type setVarFunctionClass struct {
baseFunctionClass
}
func (c *setVarFunctionClass) getFunction(args []Expression, ctx context.Context) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, errors.Trace(err)
}
bt := &builtinSetVarSig{newBaseBuiltinFunc(args, ctx)}
bt.deterministic = false
return bt, nil
}
type builtinSetVarSig struct {
baseBuiltinFunc
}
func (b *builtinSetVarSig) eval(row []types.Datum) (types.Datum, error) {
args, err := b.evalArgs(row)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
return builtinSetVar(args, b.ctx)
}
func builtinSetVar(args []types.Datum, ctx context.Context) (types.Datum, error) {
sessionVars := ctx.GetSessionVars()
varName, _ := args[0].ToString()
if !args[1].IsNull() {
strVal, err := args[1].ToString()
if err != nil {
return types.Datum{}, errors.Trace(err)
}
sessionVars.Users[varName] = strings.ToLower(strVal)
}
return args[1], nil
}
type getVarFunctionClass struct {
baseFunctionClass
}
func (c *getVarFunctionClass) getFunction(args []Expression, ctx context.Context) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, errors.Trace(err)
}
bt := &builtinGetVarSig{newBaseBuiltinFunc(args, ctx)}
bt.deterministic = false
return bt, nil
}
type builtinGetVarSig struct {
baseBuiltinFunc
}
func (b *builtinGetVarSig) eval(row []types.Datum) (types.Datum, error) {
args, err := b.evalArgs(row)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
return builtinGetVar(args, b.ctx)
}
func builtinGetVar(args []types.Datum, ctx context.Context) (types.Datum, error) {
sessionVars := ctx.GetSessionVars()
varName, _ := args[0].ToString()
if v, ok := sessionVars.Users[varName]; ok {
return types.NewDatum(v), nil
}
return types.Datum{}, nil
}
type lockFunctionClass struct {
baseFunctionClass
}
func (c *lockFunctionClass) getFunction(args []Expression, ctx context.Context) (builtinFunc, error) {
return &builtinLockSig{newBaseBuiltinFunc(args, ctx)}, errors.Trace(c.verifyArgs(args))
}
type builtinLockSig struct {
baseBuiltinFunc
}
func (b *builtinLockSig) eval(row []types.Datum) (types.Datum, error) {
args, err := b.evalArgs(row)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
return builtinLock(args, b.ctx)
}
// The lock function will do nothing.
// Warning: get_lock() function is parsed but ignored.
func builtinLock(args []types.Datum, _ context.Context) (d types.Datum, err error) {
d.SetInt64(1)
return d, nil
}
type releaseLockFunctionClass struct {
baseFunctionClass
}
func (c *releaseLockFunctionClass) getFunction(args []Expression, ctx context.Context) (builtinFunc, error) {
return &builtinReleaseLockSig{newBaseBuiltinFunc(args, ctx)}, errors.Trace(c.verifyArgs(args))
}
type builtinReleaseLockSig struct {
baseBuiltinFunc
}
func (b *builtinReleaseLockSig) eval(row []types.Datum) (types.Datum, error) {
args, err := b.evalArgs(row)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
return builtinReleaseLock(args, b.ctx)
}
// The release lock function will do nothing.
// Warning: release_lock() function is parsed but ignored.
func builtinReleaseLock(args []types.Datum, _ context.Context) (d types.Datum, err error) {
d.SetInt64(1)
return d, nil
}
type valuesFunctionClass struct {
baseFunctionClass
offset int
}
func (c *valuesFunctionClass) getFunction(args []Expression, ctx context.Context) (builtinFunc, error) {
if err := errors.Trace(c.verifyArgs(args)); err != nil {
return nil, errors.Trace(err)
}
bt := &builtinValuesSig{newBaseBuiltinFunc(args, ctx), c.offset}
bt.deterministic = false
return bt, nil
}
type builtinValuesSig struct {
baseBuiltinFunc
offset int
}
func (b *builtinValuesSig) eval(row []types.Datum) (types.Datum, error) {
args, err := b.evalArgs(row)
if err != nil {
return types.Datum{}, errors.Trace(err)
}
return BuiltinValuesFactory(b.offset)(args, b.ctx)
}
// BuiltinValuesFactory generates values builtin function.
func BuiltinValuesFactory(offset int) BuiltinFunc {
return func(_ []types.Datum, ctx context.Context) (d types.Datum, err error) {
values := ctx.GetSessionVars().CurrInsertValues
if values == nil {
err = errors.New("Session current insert values is nil")
return
}
row := values.([]types.Datum)
if len(row) > offset {
return row[offset], nil
}
err = errors.Errorf("Session current insert values len %d and column's offset %v don't match", len(row), offset)
return
}
}