Github user WeichenXu123 commented on the issue: https://github.com/apache/spark/pull/17819 @viirya Oh, I am not saying the compatibility against old version scala application. What I say is about new version `Bucketizer`, when spark user use java language(not scala language), call new added API (such as `setInputSplits`), it cannot work. i.e, the new api isn't java-compatible. for example: ``` public class JavaBucketizerExample { public static void main(String[] args) { Bucketizer bucketizer = new Bucketizer().setInputCols(new String[] {"features", "features2"}); ... } } ``` The above java program (Note not scala program) do not work. It cannot even pass compiling.
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