121 lines
3.5 KiB
Go
121 lines
3.5 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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"sync"
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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/tidb/util/stringutil"
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"github.com/pingcap/tipb/go-tipb"
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)
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var (
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_ functionClass = &ilikeFunctionClass{}
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)
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var (
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_ builtinFunc = &builtinIlikeSig{}
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)
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type ilikeFunctionClass struct {
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baseFunctionClass
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}
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func (c *ilikeFunctionClass) 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.SetFlen(1)
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sig := &builtinIlikeSig{bf, nil, false, sync.Once{}}
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sig.setPbCode(tipb.ScalarFuncSig_IlikeSig)
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return sig, nil
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}
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type builtinIlikeSig struct {
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baseBuiltinFunc
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// pattern and isMemorizedPattern is not serialized with builtinIlikeSig, treat them as a cache to accelerate
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// the evaluation of builtinIlikeSig.
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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 *builtinIlikeSig) Clone() builtinFunc {
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newSig := &builtinIlikeSig{}
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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 builtinIlikeSig.
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func (b *builtinIlikeSig) 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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valStrBytes := []byte(valStr)
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patternStrBytes := []byte(patternStr)
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stringutil.LowerOneString(valStrBytes)
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if stringutil.IsUpperASCII(byte(escape)) || stringutil.IsLowerASCII(byte(escape)) {
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escape = int64(stringutil.LowerOneStringExcludeEscapeChar(patternStrBytes, byte(escape)))
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} else {
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stringutil.LowerOneString(patternStrBytes)
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}
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valStr = string(valStrBytes)
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patternStr = string(patternStrBytes)
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memorization := func() {
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if b.pattern == nil {
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b.pattern = collate.ConvertAndGetBinCollation(b.collation).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 := collate.ConvertAndGetBinCollation(b.collation).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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