Inner joins shouldn't work when used to join the same table with itself

[jvshahid]

The server should return an error message if the user tried to join the same query with itself. The reason is, where conditions are applied after the two time series are joined, the most common use case of joining a subset of a time series with another subset won't work. Instead, the user should use subqueries to select the two subsets and apply a where condition on the result.

[janajri]

Just found this issue, after submitting this request: #652 (comment)

Might they be related?

[annismckenzie]

That's exactly what I'm after. Just to clarify: the feature you're talking about – subqueries – is not yet implemented, right?

[jvshahid]

This will be fixed as part of #72