Botong Huang created CALCITE-3947:
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Summary: AbstractRelOptPlanner.classes should be LinkedHashSet so
that rule match order is deterministic across runs
Key: CALCITE-3947
URL: https://issues.apache.org/jira/browse/CALCITE-3947
Project: Calcite
Issue Type: Improvement
Reporter: Botong Huang
AbstractRelOptPlanner.classes is used by subClasses() to determine things to
put into VolcanoPlanner.classOperands, which is then used in
VolcanoPlanner.fireRules(). Since AbstractRelOptPlanner.classes is now a
HashSet, its iteration order is not deterministic across runs, making debugging
hard. It should be LinkedHashSet just like many other fields in the planner.
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