Github user daveoshinsky commented on the issue:
https://github.com/apache/drill/pull/517
I added a print to System.out for each time that the cast (including the
precision calculation I added) is called. I found that the cast is done once
for each input integer value from the SQL select statement. It is NOT done
once per row in the Parquet file(s) that Drill is scanning. So, there should
be absolutely no performance issue with doing the precision calculation as I am
doing it. Again, this is NOT done for every row. Please review.
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