Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/23159
> Rather than change every single call to this method, if this should
generally be the value of the argument, then why not make it the default value
or something?
New parameter aims to solve the problem when there are multiple callers,
and each of them needs different maximum fields. So, a feasible approach is to
propagate `maxFields` from callers to `truncatedString`. Changing global SQL
config does not solve the problem.
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