[jira] [Created] (CALCITE-3947) AbstractRelOptPlanner.classes should be LinkedHashSet so that rule match order is deterministic across runs

["Botong Huang (Jira)" <ji...@apache.org>]

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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