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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/10/21 06:11:42 UTC
[jira] [Updated] (CASSANDRA-6167) Add end-slice termination
predicate
[ https://issues.apache.org/jira/browse/CASSANDRA-6167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis updated CASSANDRA-6167:
--------------------------------------
Labels: ponies (was: )
> Add end-slice termination predicate
> -----------------------------------
>
> Key: CASSANDRA-6167
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6167
> Project: Cassandra
> Issue Type: Improvement
> Components: API, Core
> Reporter: Tupshin Harper
> Priority: Minor
> Labels: ponies
>
> When doing performing storage-engine slices, it would sometimes be beneficial to have the slice terminate for other reasons other than number of columns or min/max cell name.
> Since we are able to look at the contents of each cell as we read it, this is potentially doable with very little overhead.
> Probably more challenging than the storage-engine implementation itself, is to come up with appropriate CQL syntax (Thrift, should we decide to support it, would be trivial).
> Two possibilities ar
> 1) special where function:
> SELECT pk,event from cf WHERE pk IN (1,5,10,11) AND partition_predicate({predicate})
> or a bigger language change, but i think one I prefer. more like:
> 2) SELECT pk,event from cf where pk IN (1,5,10,11) UNTIL PARTITION event {predicate}
> Neither feels perfect, but I do like the fact that the second one at least clearly states what it is intended to do.
> By using "UNTIL PARTITION", we could re-use the UNTIL keyword to handle other kinds of early-termination of selects that the coordinator might be able to do, such as stop retrieving additional rows from shards after a particular criterion was met.
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