Index search in provided set of rows (supporting of sub query)
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Key: CASSANDRA-3249
URL: https://issues.apache.org/jira/browse/CASSANDRA-3249
Project: Cassandra
Issue Type: New Feature
Components: API, Core
Affects Versions: 0.8.6
Reporter: Evgeny Ryabitskiy
Fix For: 1.1
This issue is related to discussion on mailing list:
http://www.mail-archive.com/user@cassandra.apache.org/msg17135.html
Idea is to support Cassandra build-in index search over specified set of rows.
>From API view:
It can be extension of get_indexed_slices, for example:
{quote}
List<byte[]> rowKys = ... ; //list of row keys
IndexClause indexClause = new IndexClause();
indexClause.setKeys(keys); //required API to set list of keys
indexClause.setExpressions(someFilteringExpressions);
List finalResult = get_indexed_slices(colParent, indexClause, colPredicate,
cLevel);
{quote}
or create specified API method.
>From conceptual view it was noticed:
That would be implementation of sub query.
{quote}
The index clause is applied to the set of all rows in the database, not a sub
set, applying them to a sub set is implicitly supporting a sub query
{quote}
Benefits of this feature is that search can be split in 2 stages:
1) Search over external engine (for example full text search)
2) Cassandra build-in index search over result from first stage
This combination could solve most of limitations that came with solution based
only on external search engine.
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