parquet-tools merge does not work nor give any error message

When I run

```Java

java -jar ./parquet-mr/parquet-tools/target/parquet-tools-1.9.1-SNAPSHOT.jar merge $inpath $outpath
```

It does not work, no matter what combination of $inpath or $outpath I use.

It gives exit code 1, but never produces an error message or any indication of what is wrong.

**Reporter**: [sam](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=sams) / @samthebest

_{**Note**: *This issue was originally created as [PARQUET-1132](https://issues.apache.org/jira/browse/PARQUET-1132). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

从 issue 中显示的 parquet-tools merge 命令开始，检查 parquet-mr/parquet-tools 模块。使用具有代表性的输入和输出路径运行报告中的 java -jar 调用，然后追踪它为何在未报告错误的情况下以 code 1 退出。完成的标准是 merge 失败时提供有用的错误消息或指出出了什么问题。

由索引模型根据 Issue 内容生成。