apache / apache/arrow-java

Support parquet write from Arrow record batch

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#735 4 条评论 1 个 reaction 已指派 0 人 在 GitHub 查看
Type: enhancement
主要语言
Java
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94
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平均合并
3 天 16 小时
30 天内合并 PR
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描述

### Describe the enhancement requested

I'm working on https://github.com/alibaba/fluss/issues/107 which enable convert Fluss arow structure data to Parquet directly but found the API missing in here.
Althogh [ARROW-11776](https://github.com/apache/arrow-java/commit/0318b07908f240a57f134e34b871786f6a168b6c) supports to write from ArrowReader to file, it read from the ArrowReader, write and close the file direclty. But it's in a very coarse-grained , we almost have no control about the writing. Sometime, we want to control when to close the written parquet. Also it requires `ArrowReader`, but if the arrow RecordBatch is read continuously from remote server . It's not easy to constuct a `ArrowReader`.
So, I think we may need to support the interface to write Arrow RecordBatch to Parquet via [virtual ::arrow::Status WriteRecordBatch(const ::arrow::RecordBatch& batch) = 0](https://github.com/apache/arrow/blob/c506b0806bd2b90410400d349a16bc4a5b1dd51c/cpp/src/parquet/arrow/writer.h#L125)
Just to as a show case, the api may look like:
```
public class ArrowBatchParquetWriter {
void write(RecordBatch recordbatch);
void close()
}
```

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调研方向

首先检查现有的基于 ArrowReader 的 Parquet 写入路径以及提议的 ArrowBatchParquetWriter API。将其需求与 Arrow 的 WriteRecordBatch 接口和 RecordBatch 的用法进行比较。完成的标准是,调用方可以增量写入多个记录批次,并且无需 ArrowReader 即可显式关闭 Parquet 输出。

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评估

技术栈
java
领域
data-engineering
Issue 类型
功能
难度
5/5
预计耗时
一周以上
活跃度
停滞
描述清晰度
基本清楚
新手友好度
35/100

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