GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/17394
[SPARK-20067] [SQL] Use treeString to print out the table schema for
CatalogTable
### What changes were proposed in this pull request?
Follow what we did in Dataset API `printSchema`, we can use `treeString` to
show the schema in the more readable way. It impacts the DDL commands like
`SHOW TABLE EXTENDED` and `DESC EXTENDED`.
Below is the current way:
```
Schema: STRUCT<`a`: STRING (nullable = true), `b`: INT (nullable = true),
`c`: STRING (nullable = true), `d`: STRING (nullable = true)>
```
After the change, it should look like
```
Schema: root
|-- a: string (nullable = true)
|-- b: integer (nullable = true)
|-- c: string (nullable = true)
|-- d: string (nullable = true)
```
### How was this patch tested?
`describe.sql` and `show-tables.sql`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark descFollowUp
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17394.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 #17394
----
commit 2ebeac854144aa4a036cac9e309c5927677b6656
Author: Xiao Li <[email protected]>
Date: 2017-03-23T02:41:49Z
fix.
commit 87209193557d363412bf4041cddeb86d60affaf4
Author: Xiao Li <[email protected]>
Date: 2017-03-23T05:39:24Z
improve
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