cassandra cql query with in condition in rowkey and in clustering columns - cassandra

Question

I am a newbie to cassandra. And i have a table with composite primary key. The description of the table is
CREATE TABLE testtable (
foid bigint,
id bigint,
severity int,
category int,
ack boolean,
PRIMARY KEY (foid, id, severity, category)
) WITH
bloom_filter_fp_chance=0.010000 AND
caching='KEYS_ONLY' AND
comment='' AND
dclocal_read_repair_chance=0.000000 AND
gc_grace_seconds=864000 AND
index_interval=128 AND
read_repair_chance=0.100000 AND
replicate_on_write='true' AND
populate_io_cache_on_flush='false' AND
default_time_to_live=0 AND
speculative_retry='NONE' AND
memtable_flush_period_in_ms=0 AND
compaction={'class': 'SizeTieredCompactionStrategy'} AND
compression={'sstable_compression': 'LZ4Compressor'};
My requirement is that i need to query the table with foid with in condition and id with range condition and severity with in condition
so when i tried the following query
select * from testtable where foid in (5,6) and id>10 and severity in (5);
i got the error message as
select * from testtable where foid in (5,6) and id>10 and severity in (5);
or even the equal condition on the severity column is suffice for me which won't work either.
Is there any way that the same can be accomplished
I tried with secondary indexes for severity and category too and that did not give me anything positive.

Answer 1

You need to successively restrict the primary keys, so the following will work:
select * from testtable where foid in (1) and id=2 and severity<20 ;
but this won't:
select * from testtable where foid in (1) and id>10 and severity=3;
What about making the query less restrictive (as you suggested in your question) as follows
select * from testtable where foid in (5,6) and id>10
And sorting through the results at the client side?
An alternative (and probably more attractive) solution would be to order your keys according to how you are going to perform the query, e.g.,
CREATE TABLE testtable2 (
foid bigint,
severity int,
id bigint,
category int,
ack boolean,
PRIMARY KEY (foid, severity, id, category)
)
allowing you to make queries like this (note the equality operation on severity, an IN operation on severity won't work):
select * from testtable2 where foid in (5,6) and severity=5 and id>10;
(tested with cql [cqlsh 4.0.1 | Cassandra 2.0.1 | CQL spec 3.1.1 | Thrift protocol 19.37.0])