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From "Michael Kjellman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14247) SASI tokenizer for simple delimiter based entries
Date Wed, 28 Feb 2018 09:21:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16380027#comment-16380027
] 

Michael Kjellman commented on CASSANDRA-14247:
----------------------------------------------

and another thought as i’m about to fall asleep: might want to add an option to determine
if we should iterate the text left or right or right to left so we can support right to left
languages 

> SASI tokenizer for simple delimiter based entries
> -------------------------------------------------
>
>                 Key: CASSANDRA-14247
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14247
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: sasi
>            Reporter: mck
>            Assignee: mck
>            Priority: Major
>             Fix For: 4.0, 3.11.x
>
>
> Currently SASI offers only two tokenizer options:
>  - NonTokenizerAnalyser
>  - StandardAnalyzer
> The latter is built upon Snowball, powerful for human languages but overkill for simple
tokenization.
> A simple tokenizer is proposed here. The need for this arose as a workaround of CASSANDRA-11182,
and to avoid the disk usage explosion when having to resort to {{CONTAINS}}. See https://github.com/openzipkin/zipkin/issues/1861
> Example use of this would be:
> {code}
> CREATE CUSTOM INDEX span_annotation_query_idx 
>     ON zipkin2.span (annotation_query) USING 'org.apache.cassandra.index.sasi.SASIIndex'

>     WITH OPTIONS = {
>         'analyzer_class': 'org.apache.cassandra.index.sasi.analyzer.DelimiterAnalyzer',

>         'delimiter': '░',
>         'case_sensitive': 'true', 
>         'mode': 'prefix', 
>         'analyzed': 'true'};
> {code}
> Original credit for this work goes to https://github.com/zuochangan



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