[jira] [Created] (CALCITE-3993) Add isDefault() to RelTrait interface

[Haisheng Yuan (Jira)]

Haisheng Yuan created CALCITE-3993:
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             Summary: Add isDefault() to RelTrait interface
                 Key: CALCITE-3993
                 URL: https://issues.apache.org/jira/browse/CALCITE-3993
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Haisheng Yuan


It is an extremely frequent usage to check whether the distribution is default 
(ANY), the collation is default (EMPTY).



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