allow and use backward scans on indexes.
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Key: DERBY-884
URL: http://issues.apache.org/jira/browse/DERBY-884
Project: Derby
Type: Improvement
Versions: 10.1.2.2
Reporter: Mike Matrigali
Priority: Minor
Improve the access interface to support backward scans, currently only forward
scans are supported.
Improve the btree implementation to support backward scans. The structure
could support this, the work just has not been done. With
row level locking, concurrent tree splitting, and current assumptions
throughout the access method that scans go top/down, left to right the
work to do a backward scan is harder than doing a forward scan. Also
once the store portion is done, there would be necessary changes to:
optimizer, execution engine, and scan interface to allow the backward
scan. This would be a hard first project.
Improve the optimizer to understand derby indexes now support backward scans.
Improve the execution engine to use the new backward scan interfaces to execute
backward scans.
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