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https://issues.apache.org/jira/browse/CASSANDRA-6644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13887669#comment-13887669
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Jorge Bay edited comment on CASSANDRA-6644 at 1/31/14 12:32 PM:
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I don't think it matches the requirements of aggregation and filtering of
[#CASSANDRA-4914] ...
What I'm proposing is a way to instruct the server how to "move the cursor"
when reading a wide row.
When you store data at high rate for measurement / metrics, it is useful to
retrieve information at "lower rate" for analysis, but anyway people can vote
on it :)
was (Author: jorgebg):
I don't think it matches the requirements of aggregation and filtering of
https://issues.apache.org/jira/browse/CASSANDRA-4914 ...
What I'm proposing is a way to instruct the server how to "move the cursor"
when reading a wide row.
When you store data at high rate for measurement / metrics, it is useful to
retrieve information at "lower rate" for analysis, but anyway people can vote
on it :)
> CQL: Select every nth row within the same partition key
> -------------------------------------------------------
>
> Key: CASSANDRA-6644
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6644
> Project: Cassandra
> Issue Type: Wish
> Reporter: Jorge Bay
>
> In a time-series schema (like metrics), it is common to create
> roollups/buckets with datapoints at different rate.
> It would be nice to have a keyword in CQL to be able to retrieve one every
> nth row (within a single storage engine wide row).
> For example, in the following schema:
> CREATE TABLE metrics (
> ... metric_id varchar,
> ... ts timestamp,
> ... value float,
> ... PRIMARY KEY (metric_id, ts)
> ... );
> The following query, will retrieve 1 in every 3 rows:
> (SKIP keyword or something like that, but don't focus on the syntax)
> SELECT ts, value WHERE metric_id = ? SKIP 2;
> This would be very useful for continuous (and somehow linear) metrics.
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