upload code for cassandra/tdengine test

tests/comparisonTest/cassandra/cqlstr

-drop keyspace if exists cassandra;
-CREATE KEYSPACE cassandra WITH replication = {'class':'SimpleStrategy', 'replication_factor':1};
-USE cassandra;
-create table test (devid int, devname text, devgroup int, ts bigint, minute bigint, temperature int, humidity float,primary key (ts, devgroup, minute));
-insert into test (devid,devname,devgroup,ts, minute,temperature,humidity) values (1, 'dev_1', 1,120000,1,1,1.2);
-create function tominute (ts bigint) returns null on null input returns bigint language java as $$ return ts/6000; $$;
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-select * from test where devgroup<1 allow filtering;
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-!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-change primary key, can't be same;