GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/18297
[SPARK-20211][SQL][Backport-2.2] Fix the Precision and Scale of Decimal
Values when the Input is BigDecimal between -1.0 and 1.0
### What changes were proposed in this pull request?
This PR is to backport https://github.com/apache/spark/pull/18244 to 2.2
---
The precision and scale of decimal values are wrong when the input is
BigDecimal between -1.0 and 1.0.
The BigDecimal's precision is the digit count starts from the leftmost
nonzero digit based on the [JAVA's BigDecimal
definition](https://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html).
However, our Decimal decision follows the database decimal standard, which is
the total number of digits, including both to the left and the right of the
decimal point. Thus, this PR is to fix the issue by doing the conversion.
Before this PR, the following queries failed:
```SQL
select 1 > 0.0001
select floor(0.0001)
select ceil(0.0001)
```
### How was this patch tested?
Added test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark backport18244
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18297.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 #18297
----
commit c9e13089dfc5315f88bc3dbb1a3d83ac8ee7d5bb
Author: gatorsmile <[email protected]>
Date: 2017-06-14T06:04:07Z
fix.
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