Maryann Xue created PHOENIX-2954:
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Summary: Avoid doing a full sort if the input is ordered on the
leading edge of the sort key
Key: PHOENIX-2954
URL: https://issues.apache.org/jira/browse/PHOENIX-2954
Project: Phoenix
Issue Type: Bug
Reporter: Maryann Xue
Assignee: Maryann Xue
Similar to PHOENIX-2344, when the sort key and the primary key share the same
leading part, we can avoid a full sort but instead only sort a window
containing rows with the same leading key. For example, "select * from t sort
by k0, c1", where t's primary key is "k0, k1".
This will affect the implementation of both distributed server sort and pure
client sort.
1) for distributed server sort, the server part will now sort a window of rows
each time, and the client part will remain the same (by using a
MergeSortIterator).
2) for pure client sort, it will sort a window of rows each time.
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