Github user huaxingao commented on a diff in the pull request:
https://github.com/apache/spark/pull/21710#discussion_r223760003
--- Diff: examples/src/main/python/ml/prefixspan_example.py ---
@@ -0,0 +1,48 @@
+#
--- End diff --
@felixcheung I don't think the doc, java/scala/python example are in 2.4.
Shall I open a separate jira to merge in the fix?
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