Broken group by function

[lee....@booking.com]

Hello!

   During our exploration of Pinot, we've noticed that if we pass a completely invalid group by function to a query, there is no obvious error that occurs:

SELECT distinctcounthll(column)
from table
group by FAKEFUNCTION(ts, '1:SECONDS:EPOCH', '1:HOURS:EPOCH', '4:HOURS')
top 100

The JSON returned doesn't seem to indicate that this operation isn't possible.  Is this expected?  Can we detect that an error occurred?  It looks like numDocsScanned is zero, is that good enough?

Thanks!

[kishore g]

We should be able to indicate that error back to the user easily. 

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