GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/14560
[SPARK-16971][SQL] Strip trailing zeros for decimals when using show() API
in Dataset
## What changes were proposed in this pull request?
Currently, `Dataset.show()` prints all the trailing zeros for decimals. For
example,
```
spark.range(11).toDF("a").select('a.cast(DecimalType(30, 20))).show()
```
prints below:
```bash
+--------------------+
| a|
+--------------------+
| 0E-20|
|1.000000000000000...|
|2.000000000000000...|
|3.000000000000000...|
|4.000000000000000...|
|5.000000000000000...|
|6.000000000000000...|
|7.000000000000000...|
|8.000000000000000...|
|9.000000000000000...|
|10.00000000000000...|
+--------------------+
```
It might be confusing, in particular, for `0E-20`. Also, I think we can
strip the trailing zeros.
This PR fixes this as below:
```bash
+---+
| a|
+---+
| 0|
| 1|
| 2|
| 3|
| 4|
| 5|
| 6|
| 7|
| 8|
| 9|
| 10|
+---+
```
## How was this patch tested?
Unit test in `DataFrameSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark SPARK-16971
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14560.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 #14560
----
commit b8a5267d495f4a9bf882c82b730c660858e1eebf
Author: hyukjinkwon <gurwls...@gmail.com>
Date: 2016-08-09T08:58:13Z
Strip trailing zeros for decimals when using show() API in Dataset
----
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