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Mck SembWever commented on CASSANDRA-2878:
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bq. We need the combination of secondary indexes and super columns
Sorry, my mistake. We don't need "at the same time" combination.
We have one cf with supercolumns (and composite columns does not suit) and
another cf with secondary indexes.
_But i do have a upcoming usecase where a basic combination would be useful:
m/r over all rows where a given supercolumn exists. Is this possible? Can you
point me towards relevant issues?_
So for now it would be nice to have solutions for
- just supercolumn queries, and
- just secondary index queries.
> Allow CQL-based map/reduce
> --------------------------
>
> Key: CASSANDRA-2878
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2878
> Project: Cassandra
> Issue Type: New Feature
> Components: Hadoop
> Reporter: Mck SembWever
> Assignee: Jonathan Ellis
> Priority: Minor
> Fix For: 1.1
>
>
> Currently, when running a MapReduce job against data in a Cassandra data
> store, it reads through all the data for a particular ColumnFamily. This
> could be optimized to only read through those rows that have to do with the
> query.
> Adding CQL support to m/r will allow using an index more simply than trying
> to cram support for more parameters into the job configuration.
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