Mike Matrigali created DERBY-6226:
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Summary: enhance optmizer to use multiple probes into multiple
indexes to satisfy OR queries on different columns.
Key: DERBY-6226
URL: https://issues.apache.org/jira/browse/DERBY-6226
Project: Derby
Issue Type: Improvement
Components: SQL
Affects Versions: 10.8.3.1, 10.11.0.0
Reporter: Mike Matrigali
For queries of the type:
select * from a where col1 = ? or col2 = ?
and good indexes exist on col1 and col2 it would optimal if derby could execute
a plan that
did an index scan first on the col1 index and then an index scan on col2 index.
Currently it looks like derby will do a full index scan if col1 and col2 are in
any index, or a full table
scan otherwise.
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