Along with the tests:

 /ibis/ibis/expr/api.py:318: DeprecationWarning: ibis.nanosecond is deprecated, use ibis.interval(nanoseconds=n) instead
    warnings.warn(msg.format(name), DeprecationWarning)
  /ibis/ibis/expr/api.py:318: DeprecationWarning: ibis.microsecond is deprecated, use ibis.interval(microseconds=n) instead
    warnings.warn(msg.format(name), DeprecationWarning)
  /ibis/i

A useR!2017 attendee asked after the implyr talk about what Impala's limitations for using DISTINCT were. Older versions of Impala (before version 2.0) allowed only one DISTINCT clause per query. Newer versions have removed this limitation. But the current version of Impala does have the limitation that you cannot use DISTINCT in more than one aggrega

Since ESDoc is one of the best options when it comes to generate documentation for ES6 codebase, I think it would be good to have proper documentation format that follows the rules of ESDoc (Syntax is almost same as JSDoc).

Also while porting, types for parameters should be added like described in tutorial.

ESDoc Tutorial