Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/21785
@wangyum my environment is
```
$ java -version
openjdk version "1.8.0_171"
OpenJDK Runtime Environment (build 1.8.0_171-8u171-b11-0ubuntu0.16.04.1-b11)
OpenJDK 64-Bit Server VM (build 25.171-b11, mixed mode)
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