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https://issues.apache.org/jira/browse/SOLR-2888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Weiss updated SOLR-2888:
------------------------------
Attachment: SOLR-2888.patch
Updated patch:
- updated to recent API refactorings in BytesRef,
- FSTCompletion doesn't use LookupResult directly (no intermediate Strings).
This is ready to be committed, two remaining TODOs (infix suggestions, use of
Analyzers for synonym suggestions, full support for float weights) will be
split into separate issues.
> FSTSuggester refactoring: utf8 storage, external sorts (OOM prevention), code
> cleanups
> --------------------------------------------------------------------------------------
>
> Key: SOLR-2888
> URL: https://issues.apache.org/jira/browse/SOLR-2888
> Project: Solr
> Issue Type: Improvement
> Components: spellchecker
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Fix For: 4.0
>
> Attachments: SOLR-2888.patch, SOLR-2888.patch
>
>
> This issue incorporates several problems:
> - utf16 was used previously to store and lookup terms, now it is utf8
> - the construction would OOM with large number of terms because of the need
> to sort entries. Sorter APIs have been added and an implementation of
> external (on-disk) sorting is also added (Robert Muir).
> - the FSTLookup class has been split and refactored into FSTCompletion and
> FSTCompletionBuilder, FSTCompletionLookup remains a facade connecting all the
> pieces and implements Lookup interface. For large inputs use
> FSTCompletionBuilder directly (and pre-bucket your input weights).
> - Automatic bucketing in FSTCompletionLookup has been changed from linear
> min/max discretization into dividing into ranges after all values have been
> sorted. This empirically handles all potential distributions quite well. If
> somebody needs something very specific, use FSTCompletionBuilder directly
> (providing buckets), construct the automaton and then load it with
> FSTCompletionLookup.
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