github.com/whtcorpsinc/milevadb-prod@v0.0.0-20211104133533-f57f4be3b597/dbs/memristed/memex/builtin_like_vec.go (about)

     1  // Copyright 2020 WHTCORPS INC, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package memex
    15  
    16  import (
    17  	"regexp"
    18  
    19  	"github.com/whtcorpsinc/errors"
    20  	"github.com/whtcorpsinc/milevadb/types"
    21  	"github.com/whtcorpsinc/milevadb/soliton/chunk"
    22  )
    23  
    24  func (b *builtinLikeSig) vectorized() bool {
    25  	return true
    26  }
    27  
    28  func (b *builtinLikeSig) vecEvalInt(input *chunk.Chunk, result *chunk.DeferredCauset) error {
    29  	n := input.NumEvents()
    30  	bufVal, err := b.bufSlabPredictor.get(types.ETString, n)
    31  	if err != nil {
    32  		return err
    33  	}
    34  	defer b.bufSlabPredictor.put(bufVal)
    35  	if err = b.args[0].VecEvalString(b.ctx, input, bufVal); err != nil {
    36  		return err
    37  	}
    38  	bufPattern, err := b.bufSlabPredictor.get(types.ETString, n)
    39  	if err != nil {
    40  		return err
    41  	}
    42  	defer b.bufSlabPredictor.put(bufPattern)
    43  	if err = b.args[1].VecEvalString(b.ctx, input, bufPattern); err != nil {
    44  		return err
    45  	}
    46  
    47  	bufEscape, err := b.bufSlabPredictor.get(types.ETInt, n)
    48  	if err != nil {
    49  		return err
    50  	}
    51  	defer b.bufSlabPredictor.put(bufEscape)
    52  	if err = b.args[2].VecEvalInt(b.ctx, input, bufEscape); err != nil {
    53  		return err
    54  	}
    55  	escapes := bufEscape.Int64s()
    56  
    57  	// Must not use b.pattern to avoid data race
    58  	pattern := b.defCauslator().Pattern()
    59  
    60  	result.ResizeInt64(n, false)
    61  	result.MergeNulls(bufVal, bufPattern, bufEscape)
    62  	i64s := result.Int64s()
    63  	for i := 0; i < n; i++ {
    64  		if result.IsNull(i) {
    65  			continue
    66  		}
    67  		pattern.Compile(bufPattern.GetString(i), byte(escapes[i]))
    68  		match := pattern.DoMatch(bufVal.GetString(i))
    69  		i64s[i] = boolToInt64(match)
    70  	}
    71  
    72  	return nil
    73  }
    74  
    75  func (b *builtinRegexpSig) vectorized() bool {
    76  	return true
    77  }
    78  
    79  func (b *builtinRegexpUTF8Sig) vectorized() bool {
    80  	return true
    81  }
    82  
    83  func (b *builtinRegexpSharedSig) isMemorizedRegexpInitialized() bool {
    84  	return !(b.memorizedRegexp == nil && b.memorizedErr == nil)
    85  }
    86  
    87  func (b *builtinRegexpSharedSig) initMemoizedRegexp(patterns *chunk.DeferredCauset, n int) {
    88  	// Precondition: patterns is generated from a constant memex
    89  	if n == 0 {
    90  		// If the input rownum is zero, the Regexp error shouldn't be generated.
    91  		return
    92  	}
    93  	for i := 0; i < n; i++ {
    94  		if patterns.IsNull(i) {
    95  			continue
    96  		}
    97  		re, err := b.compile(patterns.GetString(i))
    98  		b.memorizedRegexp = re
    99  		b.memorizedErr = err
   100  		break
   101  	}
   102  	if !b.isMemorizedRegexpInitialized() {
   103  		b.memorizedErr = errors.New("No valid regexp pattern found")
   104  	}
   105  	if b.memorizedErr != nil {
   106  		b.memorizedRegexp = nil
   107  	}
   108  }
   109  
   110  func (b *builtinRegexpSharedSig) vecEvalInt(input *chunk.Chunk, result *chunk.DeferredCauset) error {
   111  	n := input.NumEvents()
   112  	bufExpr, err := b.bufSlabPredictor.get(types.ETString, n)
   113  	if err != nil {
   114  		return err
   115  	}
   116  	defer b.bufSlabPredictor.put(bufExpr)
   117  	if err := b.args[0].VecEvalString(b.ctx, input, bufExpr); err != nil {
   118  		return err
   119  	}
   120  
   121  	bufPat, err := b.bufSlabPredictor.get(types.ETString, n)
   122  	if err != nil {
   123  		return err
   124  	}
   125  	defer b.bufSlabPredictor.put(bufPat)
   126  	if err := b.args[1].VecEvalString(b.ctx, input, bufPat); err != nil {
   127  		return err
   128  	}
   129  
   130  	if b.args[1].ConstItem(b.ctx.GetStochastikVars().StmtCtx) && !b.isMemorizedRegexpInitialized() {
   131  		b.initMemoizedRegexp(bufPat, n)
   132  	}
   133  	getRegexp := func(pat string) (*regexp.Regexp, error) {
   134  		if b.isMemorizedRegexpInitialized() {
   135  			return b.memorizedRegexp, b.memorizedErr
   136  		}
   137  		return b.compile(pat)
   138  	}
   139  
   140  	result.ResizeInt64(n, false)
   141  	result.MergeNulls(bufExpr, bufPat)
   142  	i64s := result.Int64s()
   143  	for i := 0; i < n; i++ {
   144  		if result.IsNull(i) {
   145  			continue
   146  		}
   147  		re, err := getRegexp(bufPat.GetString(i))
   148  		if err != nil {
   149  			return err
   150  		}
   151  		i64s[i] = boolToInt64(re.MatchString(bufExpr.GetString(i)))
   152  	}
   153  	return nil
   154  }