"Transactional" conversion of CSV to Parquet?

[MattK]

I have a cluster that receives log files in a csv format on a per-minute 
basis, and those files are immediately available to Drill users. For 
performance I create Parquet files from them in batch using CTAS 
commands.

I would like to script a process that makes the Parquet files available 
on creation, perhaps through a UNION view, but that does not serve 
duplicate data through both an original csv and converted Parquet file 
at the same time.

Is there a common practice to making data available once converted, in 
something similar to a transactional batch of "convert then (re)move 
source csv files" ?