Github user koertkuipers commented on the issue:
https://github.com/apache/spark/pull/21273
to summarize my findings from jira:
this breaks any usage without quoting. for example we remove all characters
from our values that need to be quoted (delimiters, newlines) so we know we
will always write unquoted csv, but now we suddenly find these empty quoted
strings in our output. the systems we write to cannot handle these quoted
values.
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