[jira] [Created] (CASSANDRA-12223) SASI Indexes querying incorrectly return 0 rows

["Qiu Zhida (JIRA)" <ji...@apache.org>]

Qiu Zhida created CASSANDRA-12223:
-------------------------------------

             Summary: 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
             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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