I have this table:
CREATE TABLE custumer_events_service.events_by_websiteId_time(
"event_id" text,
"currentTime" timestamp,
"websiteId" varchar,
OTHER COLUMNS ...
PRIMARY KEY(event_id, websiteId, currentTime)
)
In this case, would I get 10000 rows ordered by currentime
when I execute this query:
SELECT * FROM events_by_websiteid_time WHERE websiteid='xxxx' LIMIT 10000 ALLOW FILTERING;
Or did I have to add WITH CLUSTERING ORDER BY (currentTime DESC);
at the end?
Cassandra can only enforce a sort order within a partition. As you are using ALLOW FILTERING
to avoid having to provide your partition key (event_id
) your result set will be ordered by the hashed token values of each event_id
, and then by websiteid
and currentTime
.
To get your results to be ordered by currentTime
, you would need to either create a new query table or alter the PRIMARY KEY definition (and perhaps the CLUSTERING ORDER) of your existing table. If you decide to create a new query table, it would have to look something like this:
CREATE TABLE custumer_events_service.events_by_websiteId_time_eventid(
event_id text,
currentTime timestamp,
websiteId varchar,
OTHER COLUMNS ...
PRIMARY KEY (websiteid,currentTime,event_id))
WITH CLUSTERING ORDER BY (currentTime DESC, event_id ASC);
That would allow this query:
SELECT * FROM events_by_websiteid_time_eventid WHERE websiteid='xxxx' LIMIT 10000;
...to work as you expect.
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