parquet-pig should not throw an exception reading a timestamp from impala file

Hi, I need to load impala table with timestamp columns with pig. I think loading timestamp cols is still a NYI feature. Waiting for [#218](https://github.com/Parquet/parquet-mr/issues/218) TBD, pig-parquet should not throw an exception but at least should bind Int96 into a bytearray (users can write their own UDF to convert it into pig datetime type).
Is there anyone working on that?

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

_{**Note**: *This issue was originally created as [PARQUET-195](https://issues.apache.org/jira/browse/PARQUET-195). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

首先，使用包含 Int96 列的 Impala 文件跟踪 parquet-pig 的时间戳读取器，并查看 issue #218，了解待处理的时间戳上下文。完成的标准是：读取该文件时不再抛出异常，并将 Int96 以 bytearray 的形式暴露给下游 UDF 处理。

由索引模型根据 Issue 内容生成。