Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/19807 Build started: [SparkR] `ALL` [![PR-19807](https://ci.appveyor.com/api/projects/status/github/spark-test/spark?branch=4A7B521C-83BF-4F47-84AF-94D49BCBF40E&svg=true)](https://ci.appveyor.com/project/spark-test/spark/branch/4A7B521C-83BF-4F47-84AF-94D49BCBF40E) Diff: https://github.com/apache/spark/compare/branch-2.2...spark-test:4A7B521C-83BF-4F47-84AF-94D49BCBF40E
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