Thrift projection does not handle new (optional) fields in requestedSchema

It should be valid to request an optional field that is not present in a file (it should be assumed to be null) but instead this throws eagerly in:

https://github.com/apache/parquet-mr/blob/d6f082b9be5d507ff60c6bc83a179cc44015ab97/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/api/ReadSupport.java#L58

**Reporter**: [Alex Levenson](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=alexlevenson) / @isnotinvain

_{**Note**: *This issue was originally created as [PARQUET-347](https://issues.apache.org/jira/browse/PARQUET-347). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

从 parquet-hadoop/src/main/java/org/apache/parquet/hadoop/api/ReadSupport.java 中引用的行开始，跟踪 requestedSchema 的字段如何针对文件 schema 进行验证。确认文件中不存在可选字段时的行为，然后验证投影会将其视为 null，而不是立即抛出异常。

由索引模型根据 Issue 内容生成。