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From "Drew Schmitt (Jira)" <j...@apache.org>
Subject [jira] [Created] (CALCITE-3986) Provide config option to omit assigning an alias that is identical to its identifier.
Date Mon, 11 May 2020 05:12:00 GMT
Drew Schmitt created CALCITE-3986:
-------------------------------------

             Summary: Provide config option to omit assigning an alias that is identical to
its identifier.
                 Key: CALCITE-3986
                 URL: https://issues.apache.org/jira/browse/CALCITE-3986
             Project: Calcite
          Issue Type: Improvement
            Reporter: Drew Schmitt


The current alias assignment logic with the SqlValidator config option identifierExpansion()
set to true will eagerly try to choose an alias, even if the alias name ends up being the
same as the identifier itself. For example, it will assign the alias "foo" for the table "foo".

It's nice to have alias assignment, but making it identical to the identifier doesn't always
provide a whole lot of value and can make queries more verbose than they need to be.

Suggest we add another SqlValidator config option (defaulted to the current behavior) to allow
a caller to disable alias assignment in the cases that it would be identical to the identifier.



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