GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/13331
[SPARK-15550][SQL][WIP] Dataset.show() should show contents nested products
as rows
## What changes were proposed in this pull request?
This PR addresses two related issues:
1. `Dataset.showString()` should show case classes/Java beans at all levels
as rows, while master code only handles top level ones.
2. `Dataset.showString()` should show full contents produced the underlying
query plan
Dataset is only a view of the underlying query plan. Columns not
referred by the encoder are still reachable using methods like `Dataset.col`.
So it probably makes more sense to show full contents of the query plan.
(This is still in WIP status because I'd expect multiple test failures from
those test cases that depend on output of `Dataset.showString()`.)
## How was this patch tested?
Two new test cases are added in `DatasetSuite` to check `.showString()`
output.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liancheng/spark spark-15550-ds-show
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13331.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 #13331
----
commit a1baec5a3adbdfdc6fd5e414c89b05d0c97924a6
Author: Cheng Lian <[email protected]>
Date: 2016-05-26T17:51:04Z
Dataset.show() should show contents nested products as rows
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