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https://issues.apache.org/jira/browse/CASSANDRA-12223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15413142#comment-15413142
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Pavel Yaskevich commented on CASSANDRA-12223:
---------------------------------------------
Sure, I'm always happy to help.
> SASI Indexes querying incorrectly return 0 rows
> -----------------------------------------------
>
> Key: CASSANDRA-12223
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12223
> Project: Cassandra
> Issue Type: Bug
> Components: sasi
> Environment: Windows, DataStax Distribution
> Reporter: Qiu Zhida
> Assignee: Alex Petrov
> Fix For: 3.7
>
>
> I just started working with the SASI index on Cassandra 3.7.0 and I
> encountered a problem which as I suspected was a bug. I had hardly tracked
> down the situation in which the bug showed up, here is what I found:
> When querying with a SASI index, *it may incorrectly return 0 rows*, and
> changing a little conditions, it works again, like the following CQL code:
> {code:title=CQL|borderStyle=solid}
> CREATE TABLE IF NOT EXISTS roles (
> name text,
> a int,
> b int,
> PRIMARY KEY ((name, a), b)
> ) WITH CLUSTERING ORDER BY (b DESC);
>
> insert into roles (name,a,b) values ('Joe',1,1);
> insert into roles (name,a,b) values ('Joe',2,2);
> insert into roles (name,a,b) values ('Joe',3,3);
> insert into roles (name,a,b) values ('Joe',4,4);
> CREATE TABLE IF NOT EXISTS roles2 (
> name text,
> a int,
> b int,
> PRIMARY KEY ((name, a), b)
> ) WITH CLUSTERING ORDER BY (b ASC);
>
> insert into roles2 (name,a,b) values ('Joe',1,1);
> insert into roles2 (name,a,b) values ('Joe',2,2);
> insert into roles2 (name,a,b) values ('Joe',3,3);
> insert into roles2 (name,a,b) values ('Joe',4,4);
> CREATE CUSTOM INDEX ON roles (b) USING
> 'org.apache.cassandra.index.sasi.SASIIndex'
> WITH OPTIONS = { 'mode': 'SPARSE' };
> CREATE CUSTOM INDEX ON roles2 (b) USING
> 'org.apache.cassandra.index.sasi.SASIIndex'
> WITH OPTIONS = { 'mode': 'SPARSE' };
> {code}
> Noticing that I only change table *roles2* from table *roles*'s '*CLUSTERING
> ORDER BY (b DESC)*' into '*CLUSTERING ORDER BY (b ASC)*'.
> When querying with statement +select * from roles2 where b<3+, the rusult is
> two rows:
> {code:title=CQL|borderStyle=solid}
> name | a | b
> ------+---+---
> Joe | 1 | 1
> Joe | 2 | 2
> (2 rows)
> {code}
> However, if querying with +select * from roles where b<3+, it returned no
> rows at all:
> {code:title=CQL|borderStyle=solid}
> name | a | b
> ------+---+---
> (0 rows)
> {code}
> This is not the only situation where the bug would show up, one time I
> created a SASI index with specific name like 'end_idx' on column 'end', the
> bug showed up, when I didn't specify the index name, it gone.
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