Add warning when running into maxQueries limitation

[cedrics]

We had a case where a customer ran into the max queries limit and was confused because he didn't get splits at a certain point in time. We increased the maxQueries setting but in the future we may run into the same issue again if someone builds an even more complex query.

It would be great if turnilo would display a message: The requested dataset is too large and therefore incomplete. Please adjust your query

As far as I can tell, the best way to detect this is one of the SPLIT keys having the value null. I don't know the internals of plywood too much, so I am unsure if this is a sufficient condition. Do you know?

If we find a good way to detect this, is there already a way to display these kind of warnings to the user in turnilo? We would be happy to implement this in case we find a good solution here

[adrianmroz]

In general - yes. Such warning/notification is a good idea and we would need some new mechanism and component for this.

But I'm not sure if I know good way to determine that. I can see that looking for nulls in SPLIT would result in false positives.

Anyway, I'm on hiatus from turnilo till September. If you can investigate in the meantime - cool, but I will look into this in a month.