Haisheng Yuan created CALCITE-3753:
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Summary: Always try to match and execute substitution rule first
and remove rulematch ordering
Key: CALCITE-3753
URL: https://issues.apache.org/jira/browse/CALCITE-3753
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: Haisheng Yuan
Some rules e.g. ProjectMergeRule, PruneEmptyRule can be defined as
SubstitutionRule, so that we can always try to match and execute them first
(without deferring rule call). All the other rulematches doesn't need to be
sorted and rules can be executed in any order they matched, since we are going
to execute all of them anyway, sooner or later. Computing and comparing
importances cause a lot of latency.
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