GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/23086
[SPARK-25528][SQL] data source v2 API refactor (batch read)
## What changes were proposed in this pull request?
This is the first step of the data source v2 API refactor
[proposal](https://docs.google.com/document/d/1uUmKCpWLdh9vHxP7AWJ9EgbwB_U6T3EJYNjhISGmiQg/edit?usp=sharing)
It adds the new API for batch read, without removing the old APIs, as they
are still needed for streaming sources.
More concretely, it adds
1. `TableProvider`, works like an anonymous catalog
2. `Table`, represents a structured data set.
3. `ScanBuilder` and `Scan`, a logical represents of data source scan
4. `Batch`, a physical representation of data source batch scan.
## How was this patch tested?
existing tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark refactor-batch
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/23086.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #23086
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commit f06b5c58b1a890d425abd575fa6f4c40da7c4b3d
Author: Wenchen Fan <wenchen@...>
Date: 2018-11-19T11:05:07Z
data source v2 API refactor (batch read)
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