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https://issues.apache.org/jira/browse/LUCENE-1606?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-1606:
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Attachment: BenchWildcard.java
attached is benchmark, which generates random wildcard queries.
it builds an index of 10million docs, each with a term from 0-10million.
it will fill a pattern such as N?N?N?N? with random digits, substituting a
random digit for N.
||Pattern||Iter||AvgHits||AvgMS (old)||AvgMS (new)||
|N?N?N?N|10|1000.0|288.6|38.5|
|?NNNNNN|10|10.0|2453.1|6.4|
|??NNNNN|10|100.0|2484.2|10.1|
|???NNNN|10|1000.0|2821.3|47.8|
|????NNN|10|10000.0|2346.9|299.8|
|NN??NNN|10|100.0|34.8|6.3|
|NN?N*|10|10000.0|26.5|9.4|
|?NN*|10|100000.0|2009.0|73.5|
|*N|10|1000000.0|6837.4|6087.9|
|NNNNN??|10|100.0|1.9|2.3|
i would like to incorporate part of this logic into the junit tests, on maybe a
smaller index, because its how i found the recursion bug.
> Automaton Query/Filter (scalable regex)
> ---------------------------------------
>
> Key: LUCENE-1606
> URL: https://issues.apache.org/jira/browse/LUCENE-1606
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Reporter: Robert Muir
> Assignee: Robert Muir
> Priority: Minor
> Fix For: 3.1
>
> Attachments: automaton.patch, automatonMultiQuery.patch,
> automatonmultiqueryfuzzy.patch, automatonMultiQuerySmart.patch,
> automatonWithWildCard.patch, automatonWithWildCard2.patch,
> BenchWildcard.java, LUCENE-1606.patch, LUCENE-1606.patch, LUCENE-1606.patch,
> LUCENE-1606.patch, LUCENE-1606.patch, LUCENE-1606.patch, LUCENE-1606.patch,
> LUCENE-1606.patch, LUCENE-1606_nodep.patch
>
>
> Attached is a patch for an AutomatonQuery/Filter (name can change if its not
> suitable).
> Whereas the out-of-box contrib RegexQuery is nice, I have some very large
> indexes (100M+ unique tokens) where queries are quite slow, 2 minutes, etc.
> Additionally all of the existing RegexQuery implementations in Lucene are
> really slow if there is no constant prefix. This implementation does not
> depend upon constant prefix, and runs the same query in 640ms.
> Some use cases I envision:
> 1. lexicography/etc on large text corpora
> 2. looking for things such as urls where the prefix is not constant (http://
> or ftp://)
> The Filter uses the BRICS package (http://www.brics.dk/automaton/) to convert
> regular expressions into a DFA. Then, the filter "enumerates" terms in a
> special way, by using the underlying state machine. Here is my short
> description from the comments:
> The algorithm here is pretty basic. Enumerate terms but instead of a
> binary accept/reject do:
>
> 1. Look at the portion that is OK (did not enter a reject state in the
> DFA)
> 2. Generate the next possible String and seek to that.
> the Query simply wraps the filter with ConstantScoreQuery.
> I did not include the automaton.jar inside the patch but it can be downloaded
> from http://www.brics.dk/automaton/ and is BSD-licensed.
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