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154 lines
3.8 KiB
154 lines
3.8 KiB
// Copyright 2019 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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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/types"
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"github.com/pingcap/tidb/util/chunk"
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)
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func (b *builtinLikeSig) vectorized() bool {
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return true
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}
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func (b *builtinLikeSig) vecEvalInt(input *chunk.Chunk, result *chunk.Column) error {
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n := input.NumRows()
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bufVal, err := b.bufAllocator.get(types.ETString, n)
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if err != nil {
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return err
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}
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defer b.bufAllocator.put(bufVal)
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if err = b.args[0].VecEvalString(b.ctx, input, bufVal); err != nil {
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return err
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}
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bufPattern, err := b.bufAllocator.get(types.ETString, n)
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if err != nil {
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return err
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}
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defer b.bufAllocator.put(bufPattern)
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if err = b.args[1].VecEvalString(b.ctx, input, bufPattern); err != nil {
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return err
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}
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bufEscape, err := b.bufAllocator.get(types.ETInt, n)
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if err != nil {
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return err
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}
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defer b.bufAllocator.put(bufEscape)
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if err = b.args[2].VecEvalInt(b.ctx, input, bufEscape); err != nil {
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return err
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}
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escapes := bufEscape.Int64s()
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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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result.ResizeInt64(n, false)
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result.MergeNulls(bufVal, bufPattern, bufEscape)
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i64s := result.Int64s()
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for i := 0; i < n; i++ {
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if result.IsNull(i) {
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continue
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}
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pattern.Compile(bufPattern.GetString(i), byte(escapes[i]))
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match := pattern.DoMatch(bufVal.GetString(i))
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i64s[i] = boolToInt64(match)
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}
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return nil
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}
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func (b *builtinRegexpSig) vectorized() bool {
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return true
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}
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func (b *builtinRegexpUTF8Sig) vectorized() bool {
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return true
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}
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func (b *builtinRegexpSharedSig) isMemorizedRegexpInitialized() bool {
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return !(b.memorizedRegexp == nil && b.memorizedErr == nil)
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}
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func (b *builtinRegexpSharedSig) initMemoizedRegexp(patterns *chunk.Column, n int) {
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// Precondition: patterns is generated from a constant expression
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if n == 0 {
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// If the input rownum is zero, the Regexp error shouldn't be generated.
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return
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}
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for i := 0; i < n; i++ {
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if patterns.IsNull(i) {
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continue
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}
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re, err := b.compile(patterns.GetString(i))
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b.memorizedRegexp = re
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b.memorizedErr = err
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break
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}
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if !b.isMemorizedRegexpInitialized() {
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b.memorizedErr = errors.New("No valid regexp pattern found")
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}
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if b.memorizedErr != nil {
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b.memorizedRegexp = nil
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}
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}
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func (b *builtinRegexpSharedSig) vecEvalInt(input *chunk.Chunk, result *chunk.Column) error {
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n := input.NumRows()
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bufExpr, err := b.bufAllocator.get(types.ETString, n)
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if err != nil {
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return err
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}
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defer b.bufAllocator.put(bufExpr)
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if err := b.args[0].VecEvalString(b.ctx, input, bufExpr); err != nil {
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return err
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}
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bufPat, err := b.bufAllocator.get(types.ETString, n)
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if err != nil {
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return err
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}
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defer b.bufAllocator.put(bufPat)
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if err := b.args[1].VecEvalString(b.ctx, input, bufPat); err != nil {
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return err
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}
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if b.args[1].ConstItem(b.ctx.GetSessionVars().StmtCtx) && !b.isMemorizedRegexpInitialized() {
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b.initMemoizedRegexp(bufPat, n)
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}
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getRegexp := func(pat string) (*regexp.Regexp, error) {
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if b.isMemorizedRegexpInitialized() {
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return b.memorizedRegexp, b.memorizedErr
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}
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return b.compile(pat)
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}
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result.ResizeInt64(n, false)
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result.MergeNulls(bufExpr, bufPat)
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i64s := result.Int64s()
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for i := 0; i < n; i++ {
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if result.IsNull(i) {
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continue
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}
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re, err := getRegexp(bufPat.GetString(i))
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if err != nil {
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return err
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}
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i64s[i] = boolToInt64(re.MatchString(bufExpr.GetString(i)))
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}
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return nil
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}
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