Github user jsnowacki commented on the issue:
https://github.com/apache/spark/pull/19443
@HyukjinKwon It takes the argument the functions imported via
`_create_function` and tries to cast it to `Column` via `_to_java_column`
functions. Before it was passing the argument as is, and, thus, some functions,
like `trim` that didn't have String argument on the Scala API side, can take
both string column name and `Column` object.
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