[Java] Read a Parquet file into a Table
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### Describe the usage question you have. Please include as many useful details as possible.
In Java, what is the canonical way of reading the whole content of a Parquet file into a Table?
I can read the file, as suggested, in a streaming fashion with VectorSchemaRoot, but then I miss how to collate all the batches into a single table.
From what I have understood, the options I have are:
1. build a big VectorSchemaRoot using VectorSchemaRootAppender, then invoke the Table constructor passing the vsr
2. construct FieldVectors explicitly, then read the parquet rows one by one (filling the FieldVectors as I go), then invoke the Table constructor passing a List
I see the C++ implementation has a convenient FromRecordBatches method.
### Component(s)
Java
贡献指南
调研方向
首先阅读 VectorSchemaRoot、VectorSchemaRootAppender 以及 Table 构造函数相关的 Java 用法,然后与 issue 中提到的 C++ FromRecordBatches 实现进行比较。当项目确定并记录了将完整 Parquet 文件加载到一个 Table 中的规范路径,或提供具有覆盖率的等效 Java API 时,即视为完成。
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