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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11067) Improve SASI syntax
Date Thu, 04 Feb 2016 02:11:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15131575#comment-15131575
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Jonathan Ellis commented on CASSANDRA-11067:
--------------------------------------------

bq. The problem which that approach is some of the tokenization doesn't cause changes to internal
structure of the text so requiring always to use "=" is not aways adequate.

Not sure what you mean.  You can always use {{LIKE 'term'}} where you could use {{= 'term'}},
right?  So just use LIKE and leave = for untokenized (and numeric) comparison.

bq.  I would say we need to let indexing implementations decide what ops to support and how
to support them, because "=" for tokenized/stemmed results is a norm.

Where is = the norm?  Jon gave a good summary above for LIKE behavior, I can add that none
of those systems overload = for tokenization.

> Improve SASI syntax
> -------------------
>
>                 Key: CASSANDRA-11067
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11067
>             Project: Cassandra
>          Issue Type: Task
>          Components: CQL
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>             Fix For: 3.4
>
>
> I think everyone agrees that a LIKE operator would be ideal, but that's probably not
in scope for an initial 3.4 release.
> Still, I'm uncomfortable with the initial approach of overloading = to mean "satisfies
index expression."  The problem is that it will be very difficult to back out of this behavior
once people are using it.
> I propose adding a new operator in the interim instead.  Call it MATCHES, maybe.  With
the exact same behavior that SASI currently exposes, just with a separate operator rather
than being rolled into =.



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