GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/22547
[SPARK-25528][SQL] data source V2 read side API refactoring
## What changes were proposed in this pull request?
Refactor the read side API according to the abstraction proposed in the
[dev
list](http://apache-spark-developers-list.1001551.n3.nabble.com/data-source-api-v2-refactoring-td24848.html)
```
batch: catalog -> table -> scan
streaming: catalog -> table -> stream -> scan
```
More concretely, this PR
1. add a new interface called `Format` that can return `Table`
2. rename `ReadSupportProvider` to `Table`, represents a logical data set,
with a schema.
3. add a new interface `InputStream` to represent a streaming source in a
streaming query. It can create `Scan`s.
4. rename `ReadSupport` to `Scan`. Each `Scan` triggers one Spark job.
(like an RDD)
## 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 new-idea
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22547.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 #22547
----
commit 92dfdaf990f2676d49766f5ab094e8b8a9a755b1
Author: Wenchen Fan <wenchen@...>
Date: 2018-08-27T15:20:08Z
data source V2 read side API refactoring
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