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From "Jack Krupansky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11067) Improve SASI syntax
Date Mon, 25 Jan 2016 16:38:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15115501#comment-15115501
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Jack Krupansky commented on CASSANDRA-11067:
--------------------------------------------

How about a severely restricted LIKE that only permits patterns ending with a "%" for prefix
query (LIKE 'J%') or with a "%" at either end for contains (LIKE '%abc%') or ending with a
% for suffix query (LIKE '%smith')? Then it would be fully compatible with SQL.

In any case, "=" would then attempt an exact match using the SASI index? That would allow
both exact and inexact matching for each column using a single index.

If we can't have this restricted LIKE, descriptive keyword operators like SUFFIX and PREFIX
would seem desirable. Could the existing CONTAINS operator also be used? They would also handle
the case where the prefix/suffix/contains string is a parameter - otherwise the user has to
do a messy concat.

> 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: Sam Tunnicliffe
>
> 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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