Julian Hyde created CALCITE-557:
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Summary: Remove AbstractConverter
Key: CALCITE-557
URL: https://issues.apache.org/jira/browse/CALCITE-557
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
Currently each subset contains an AbstractConverter to each subset in the same
set. If there are a lot of active traits, there are many, many
AbstractConverters that do not add anything to the planning.
This task would remove those AbstractConverters. In fact AbstractConverter
would never be created.
Also, make costing of joins more deterministic when both inputs have the same
number of rows. Currently we use the RelNode.id of the inputs, but this is
unstable if we change what rules are activated. So, we should order the inputs
based on the number of columns first, and on id only if that fails.
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