Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/23012 Yea will take a look to address. But about documenting unsupported, if we explicitly are going to say it's unsupported and dropped, for instance, we should remove the compatibility change (https://github.com/apache/spark/blob/master/R/pkg/src-native/string_hash_code.c) and I assume previous versions don't work. Deprecation step might be more concervative and consistent with dropping steps of other language APIs.
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