Github user dhunziker commented on the issue:
https://github.com/apache/spark/pull/16812
Oracle doesn't have boolean so it's usually modelled as char(1) with Y/N,
Sybase doesn't have boolean either but bit which is 1/0. PosgreSQL supports a
range of values
(https://www.postgresql.org/docs/10/static/datatype-boolean.html). In regards
to CSV parsers I found the same feature in SuperCSV and uniVocity (linked
above). I think it's a very useful and common feature similar to custom date
formats or null strings, but as mentioned before, not something that can't be
worked around.
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