[jira] [Created] (CASSANDRA-7107) General minor tidying of CollationController path

["Benedict (JIRA)" <ji...@apache.org>]

Benedict created CASSANDRA-7107:
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             Summary: General minor tidying of CollationController path
                 Key: CASSANDRA-7107
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7107
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Benedict
            Assignee: Benedict
            Priority: Minor
             Fix For: 2.1.0


There is a lot of unnecessary boiler plate when grabbing an iterator from an in-memory column family. This patch:

* Removes FakeCellName
* Avoids wrapping a non-OnDiskAtomIterator as an OnDiskAtomIterator except when the wrapping is useful
* Removes ColumnSlice.NavigableSetIterator and creates a simpler more direct equivalent in ABTC
* Does not construct a SliceIterator in either ABSC or ABTC if only one slice is requested (just returns that slice as an Iterator)
* Does not construct multiple list indirections in ABSC when constructing a slice
* Shares forward/reverse iterators in ABSC between slices and full-iteration
* Avoids O(N) comparisons during collation of results into an ABSC, by using the knowledge that all columns are provided in insertion order from a merge iterator





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