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From DuyHai Doan <doanduy...@gmail.com>
Subject Re: How to query '%' character using LIKE operator in Cassandra 3.7?
Date Tue, 13 Sep 2016 16:31:25 GMT
CREATE CUSTOM INDEX ON test.escape(val) USING
'org.apache.cassandra.index.sasi.SASIIndex' WITH OPTIONS = {'mode':
'CONTAINS', 'analyzer_class':
'org.apache.cassandra.index.sasi.analyzer.NonTokenizingAnalyzer',
'case_sensitive': 'false'};

I don't see any problem in the results you got

SELECT * FROM escape WHERE val LIKE '%%esc%'; --> Give all results
*containing* '%esc' so *%esc*apeme is a possible match and also escape*%esc*

SELECT * FROM escape WHERE val LIKE 'escape%%' --> Give all results
*starting* with 'escape%' so *escape%*me is a valid result and also
*escape%*esc

On Tue, Sep 13, 2016 at 5:58 PM, Mikhail Krupitskiy <
mikhail.krupitskiy@jetbrains.com> wrote:

> Thanks for the reply.
> Could you please provide what index definition did you use?
> With the index from my script I get the following results:
>
> cqlsh:test> select * from escape;
>
>  id | val
> ----+-----------
>   1 | %escapeme
>   2 | escape%me
> *  3 | escape%esc*
>
> Contains search
>
> cqlsh:test> SELECT * FROM escape WHERE val LIKE '%%esc%';
>
>  id | val
> ----+-----------
>   1 | %escapeme
>   3
> * | escape%esc*(2 rows)
>
>
> Prefix search
>
> cqlsh:test> SELECT * FROM escape WHERE val LIKE 'escape%%';
>
>  id | val
> ----+-----------
>   2 | escape%me
>   3
> * | escape%esc*
>
> Thanks,
> Mikhail
>
> On 13 Sep 2016, at 18:16, DuyHai Doan <doanduyhai@gmail.com> wrote:
>
> Use % to escape %
>
> cqlsh:test> select * from escape;
>
>  id | val
> ----+-----------
>   1 | %escapeme
>   2 | escape%me
>
>
> Contains search
>
> cqlsh:test> SELECT * FROM escape WHERE val LIKE '%%esc%';
>
>  id | val
> ----+-----------
>   1 | %escapeme
>
> (1 rows)
>
>
> Prefix search
>
> cqlsh:test> SELECT * FROM escape WHERE val LIKE 'escape%%';
>
>  id | val
> ----+-----------
>   2 | escape%me
>
> On Tue, Sep 13, 2016 at 5:06 PM, Mikhail Krupitskiy <
> mikhail.krupitskiy@jetbrains.com> wrote:
>
>> Hi Cassandra guys,
>>
>> I use Cassandra 3.7 and wondering how to use ‘%’ as a simple char in a
>> search pattern.
>> Here is my test script:
>>
>> DROP keyspace if exists kmv;
>> CREATE keyspace if not exists kmv WITH REPLICATION = { 'class' :
>> 'SimpleStrategy', 'replication_factor':'1'} ;
>> USE kmv;
>> CREATE TABLE if not exists kmv (id int, c1 text, c2 text, PRIMARY KEY(id,
>> c1));
>> CREATE CUSTOM INDEX ON kmv.kmv  ( c2 ) USING '
>> org.apache.cassandra.index.sasi.SASIIndex' WITH OPTIONS = {
>> 'analyzed' : 'true',
>> 'analyzer_class' : 'org.apache.cassandra.index.sa
>> si.analyzer.NonTokenizingAnalyzer',
>> 'case_sensitive' : 'false',
>> 'mode' : 'CONTAINS'
>> };
>>
>> INSERT into kmv (id, c1, c2) values (1, 'f22', 'qwe%asd');
>> INSERT into kmv (id, c1, c2) values (2, 'f22', '%asd');
>> INSERT into kmv (id, c1, c2) values (3, 'f22', 'asd%');
>> INSERT into kmv (id, c1, c2) values (4, 'f22', 'asd%1');
>> INSERT into kmv (id, c1, c2) values (5, 'f22', 'qweasd');
>>
>> SELECT c2 from kmv.kmv where c2 like ‘_pattern_';
>>
>> _pattern_ '%%%' finds all columns that contain %.
>> How to find columns that start form ‘%’ or ‘%a’?
>> How to find columns that end with ‘%’?
>> What about more complex patterns: '%qwe%a%sd%’? How to differentiate ‘%’
>> char form % as a command symbol? (Also there is a related issue
>> CASSANDRA-12573).
>>
>>
>> Thanks,
>> Mikhail
>
>
>
>

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