Github user patricker commented on the issue:
https://github.com/apache/nifi/pull/2194
@ijokarumawak I made several changes, though not really what you asked
for... I replied separately on data formatting. As for EL, see my comments
below.
I wanted to move towards generating CSV files that can be easily parsed by
using the CSV Record Reader. So I exposed the CSVUtils Properties and put them
on to this processor. I was having problems with comma's in my input file
before, but after these changes that isn't an issue anymore. I also wanted the
code to be easier to maintain, so I tried to move as much of the CSV code to
the existing code in the record serializers module. That code,
`CSVUtils.createCSVFormat`, does not use EL, which makes sense since it's all
being defined on a Controller Service.
I tried making an Excel Spreadsheet Record Reader, and I did make one, but
it did not use streaming. It loaded the whole spreadsheet into memory. I
couldn't find a way using the Apache POI project to do stream reading one row
at a time (instead of all rows at once).
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