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207 lines
5.8 KiB
207 lines
5.8 KiB
// Copyright 2015 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 expression
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import (
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"regexp"
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"sync"
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"github.com/pingcap/parser/charset"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/types"
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"github.com/pingcap/tidb/util/chunk"
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"github.com/pingcap/tidb/util/collate"
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"github.com/pingcap/tipb/go-tipb"
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)
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var (
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_ functionClass = &likeFunctionClass{}
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_ functionClass = ®expFunctionClass{}
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)
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var (
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_ builtinFunc = &builtinLikeSig{}
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_ builtinFunc = &builtinRegexpSig{}
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_ builtinFunc = &builtinRegexpUTF8Sig{}
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)
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type likeFunctionClass struct {
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baseFunctionClass
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}
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func (c *likeFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
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if err := c.verifyArgs(args); err != nil {
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return nil, err
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}
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argTp := []types.EvalType{types.ETString, types.ETString, types.ETInt}
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bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, argTp...)
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if err != nil {
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return nil, err
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}
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bf.tp.Flen = 1
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sig := &builtinLikeSig{bf, nil, false, sync.Once{}}
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sig.setPbCode(tipb.ScalarFuncSig_LikeSig)
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return sig, nil
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}
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type builtinLikeSig struct {
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baseBuiltinFunc
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// pattern and isMemorizedPattern is not serialized with builtinLikeSig, treat them as a cache to accelerate
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// the evaluation of builtinLikeSig.
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pattern collate.WildcardPattern
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isMemorizedPattern bool
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once sync.Once
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}
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func (b *builtinLikeSig) Clone() builtinFunc {
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newSig := &builtinLikeSig{}
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newSig.cloneFrom(&b.baseBuiltinFunc)
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newSig.pattern = b.pattern
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newSig.isMemorizedPattern = b.isMemorizedPattern
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return newSig
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}
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// evalInt evals a builtinLikeSig.
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// See https://dev.mysql.com/doc/refman/5.7/en/string-comparison-functions.html#operator_like
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func (b *builtinLikeSig) evalInt(row chunk.Row) (int64, bool, error) {
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valStr, isNull, err := b.args[0].EvalString(b.ctx, row)
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if isNull || err != nil {
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return 0, isNull, err
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}
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patternStr, isNull, err := b.args[1].EvalString(b.ctx, row)
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if isNull || err != nil {
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return 0, isNull, err
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}
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escape, isNull, err := b.args[2].EvalInt(b.ctx, row)
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if isNull || err != nil {
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return 0, isNull, err
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}
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memorization := func() {
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if b.pattern == nil {
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b.pattern = b.collator().Pattern()
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if b.args[1].ConstItem(b.ctx.GetSessionVars().StmtCtx) && b.args[2].ConstItem(b.ctx.GetSessionVars().StmtCtx) {
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b.pattern.Compile(patternStr, byte(escape))
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b.isMemorizedPattern = true
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}
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}
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}
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// Only be executed once to achieve thread-safe
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b.once.Do(memorization)
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if !b.isMemorizedPattern {
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// Must not use b.pattern to avoid data race
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pattern := b.collator().Pattern()
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pattern.Compile(patternStr, byte(escape))
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return boolToInt64(pattern.DoMatch(valStr)), false, nil
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}
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return boolToInt64(b.pattern.DoMatch(valStr)), false, nil
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}
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type regexpFunctionClass struct {
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baseFunctionClass
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}
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func (c *regexpFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
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if err := c.verifyArgs(args); err != nil {
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return nil, err
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}
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bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, types.ETString, types.ETString)
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if err != nil {
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return nil, err
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}
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bf.tp.Flen = 1
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var sig builtinFunc
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if bf.collation == charset.CollationBin {
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sig = newBuiltinRegexpSig(bf)
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sig.setPbCode(tipb.ScalarFuncSig_RegexpSig)
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} else {
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sig = newBuiltinRegexpUTF8Sig(bf)
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sig.setPbCode(tipb.ScalarFuncSig_RegexpUTF8Sig)
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}
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return sig, nil
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}
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type builtinRegexpSharedSig struct {
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baseBuiltinFunc
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compile func(string) (*regexp.Regexp, error)
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memorizedRegexp *regexp.Regexp
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memorizedErr error
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}
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func (b *builtinRegexpSharedSig) clone(from *builtinRegexpSharedSig) {
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b.cloneFrom(&from.baseBuiltinFunc)
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b.compile = from.compile
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if from.memorizedRegexp != nil {
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b.memorizedRegexp = from.memorizedRegexp.Copy()
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}
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b.memorizedErr = from.memorizedErr
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}
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// evalInt evals `expr REGEXP pat`, or `expr RLIKE pat`.
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// See https://dev.mysql.com/doc/refman/5.7/en/regexp.html#operator_regexp
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func (b *builtinRegexpSharedSig) evalInt(row chunk.Row) (int64, bool, error) {
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expr, isNull, err := b.args[0].EvalString(b.ctx, row)
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if isNull || err != nil {
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return 0, true, err
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}
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pat, isNull, err := b.args[1].EvalString(b.ctx, row)
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if isNull || err != nil {
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return 0, true, err
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}
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re, err := b.compile(pat)
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if err != nil {
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return 0, true, ErrRegexp.GenWithStackByArgs(err.Error())
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}
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return boolToInt64(re.MatchString(expr)), false, nil
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}
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type builtinRegexpSig struct {
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builtinRegexpSharedSig
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}
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func newBuiltinRegexpSig(bf baseBuiltinFunc) *builtinRegexpSig {
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shared := builtinRegexpSharedSig{baseBuiltinFunc: bf}
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shared.compile = regexp.Compile
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return &builtinRegexpSig{builtinRegexpSharedSig: shared}
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}
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func (b *builtinRegexpSig) Clone() builtinFunc {
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newSig := &builtinRegexpSig{}
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newSig.clone(&b.builtinRegexpSharedSig)
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return newSig
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}
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type builtinRegexpUTF8Sig struct {
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builtinRegexpSharedSig
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}
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func newBuiltinRegexpUTF8Sig(bf baseBuiltinFunc) *builtinRegexpUTF8Sig {
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shared := builtinRegexpSharedSig{baseBuiltinFunc: bf}
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if collate.IsCICollation(bf.collation) {
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shared.compile = func(pat string) (*regexp.Regexp, error) {
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return regexp.Compile("(?i)" + pat)
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}
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} else {
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shared.compile = regexp.Compile
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}
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return &builtinRegexpUTF8Sig{builtinRegexpSharedSig: shared}
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}
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func (b *builtinRegexpUTF8Sig) Clone() builtinFunc {
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newSig := &builtinRegexpUTF8Sig{}
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newSig.clone(&b.builtinRegexpSharedSig)
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return newSig
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}
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