Rick Hillegas created DERBY-6211:
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Summary: Make Optimizer trace logic pluggable.
Key: DERBY-6211
URL: https://issues.apache.org/jira/browse/DERBY-6211
Project: Derby
Issue Type: Improvement
Components: SQL
Affects Versions: 10.11.0.0
Reporter: Rick Hillegas
Assignee: Rick Hillegas
Right now the trace logic in the optimizer is hard-coded to produce a stream of
diagnostics. It would be good to be able to plug alternative trace logic into
the optimizer. This would make the following possible:
1) Plug in trace logic which produces formats which are easier to study and
which can be analyzed mechanically. E.g., xml formatted output.
2) Plug in trace logic which can be used during unit testing to verify that the
optimizer has picked the right plan. Over time this might make it easier to
migrate canon-based tests to assertion-based tests.
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