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From "DOAN DuyHai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12573) SASI index. Incorrect results for '%foo%bar%'-like search pattern.
Date Fri, 16 Sep 2016 11:22:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15496060#comment-15496060
] 

DOAN DuyHai commented on CASSANDRA-12573:
-----------------------------------------

"To let users to query strings by more flexible patterns. E.g. to find '123foo456bar789' by
the '%foo%bar%' pattern." 

--> Feasible but not sure how complex it would be, and if it will be as optimized as the
current impl

Anyway, please create a new JIRA for this feature request and close this one since it's not
a bug

> SASI index. Incorrect results for '%foo%bar%'-like search pattern. 
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-12573
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12573
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Mikhail Krupitskiy
>            Priority: Critical
>              Labels: sasi
>
> We use Cassandra 3.7 and have faced a strange behaviour of SELECT requests with "LIKE
'%foo%bar%'" constraints on a column with SASI index.
> Below are few experiments that show this behaviour.
> Experiment 1:
> {noformat}
> 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 primary key, c1 text, c2 text);
> CREATE CUSTOM INDEX ON kmv.kmv  ( c2 ) USING 'org.apache.cassandra.index.sasi.SASIIndex'
WITH OPTIONS = {
>  'mode': 'CONTAINS'
> };
> insert into kmv (id, c1, c2) values (1, 'f21', 'qwe') ;
> insert into kmv (id, c1, c2) values (2, 'f22', 'qweasd') ;
> insert into kmv (id, c1, c2) values (3, 'f23', 'qwea1') ;
> insert into kmv (id, c1, c2) values (4, 'f24', '1qwe') ;
> insert into kmv (id, c1, c2) values (5, 'f25', 'asdqwe') ;
> select c2 from kmv.kmv where c2 like '%w%a%';
> {noformat}
> Expected result: qweasd, qwea1.
> Actual result: no rows.
> Experiment 2 (NOTE: definition of index is changed):
> {noformat}
> 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 primary key, c1 text, c2 text);
> CREATE CUSTOM INDEX ON kmv.kmv  ( c2 ) USING 'org.apache.cassandra.index.sasi.SASIIndex'
WITH OPTIONS = {
>  'mode': 'CONTAINS',
>  'analyzer_class': 'org.apache.cassandra.index.sasi.analyzer.StandardAnalyzer',
>  'analyzed': 'true'
> };
> insert into kmv (id, c1, c2) values (1, 'f21', 'qwe') ;
> insert into kmv (id, c1, c2) values (2, 'f22', 'qweasd') ;
> insert into kmv (id, c1, c2) values (3, 'f23', 'qwea1') ;
> insert into kmv (id, c1, c2) values (4, 'f24', '1qwe') ;
> insert into kmv (id, c1, c2) values (5, 'f25', 'asdqwe') ;
> select c2 from kmv.kmv where c2 like '%w%a%';
> {noformat}
> Expected result: qweasd, qwea1.
> Actual result: asdqwe, qweasd, qwea1.
> Experiment 3 (NOTE: primary key is compound now and inserted data was changed):
> {noformat}
> 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 = {
>  'mode': 'CONTAINS',
>  'analyzer_class': 'org.apache.cassandra.index.sasi.analyzer.StandardAnalyzer',
>  'analyzed': 'true'
> };
> insert into kmv (id, c1, c2) values (1, 'f21', 'qwe') ;
> insert into kmv (id, c1, c2) values (1, 'f22', 'qweasd') ;
> insert into kmv (id, c1, c2) values (1, 'f23', 'qwea1') ;
> insert into kmv (id, c1, c2) values (1, 'f24', '1qwe') ;
> insert into kmv (id, c1, c2) values (1, 'f25', 'asdqwe') ;
> select c2 from kmv.kmv where c2 like '%w%a%';
> {noformat}
> Expected result: qweasd, qwea1.
> Actual result: qwe, qweasd, qwea1, 1qwe, asdqwe.
> Experiment 4 (NOTE: search criteria is changed):
> {noformat}
> 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 = {
>  'mode': 'CONTAINS',
>  'analyzer_class': 'org.apache.cassandra.index.sasi.analyzer.StandardAnalyzer',
>  'analyzed': 'true'
> };
> insert into kmv (id, c1, c2) values (1, 'f21', 'qwe') ;
> insert into kmv (id, c1, c2) values (1, 'f22', 'qweasd') ;
> insert into kmv (id, c1, c2) values (1, 'f23', 'qwea1') ;
> insert into kmv (id, c1, c2) values (1, 'f24', '1qwe') ;
> insert into kmv (id, c1, c2) values (1, 'f25', 'asdqwe') ;
> select c2 from kmv.kmv where c2 like '%w22%a%';
> {noformat}
> Expected result: no rows.
> Actual result: qweasd, qwea1, asdqwe.



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