GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/13358
[SPARK-15612][SQL] Raise exception if decimal `scale` >= `precision`
## What changes were proposed in this pull request?
Currently, Spark raises exceptions only when decimal `scale` > `precision`.
However, the value becames `null` if `scale` = `precision`. We should raise
exceptions for that case, too.
**Before**
```scala
scala> sql("select cast('1' as Decimal(2,1))")
res0: org.apache.spark.sql.DataFrame = [CAST(1 AS DECIMAL(2,1)):
decimal(2,1)]
scala> sql("select cast('1' as Decimal(2,2))")
res1: org.apache.spark.sql.DataFrame = [CAST(1 AS DECIMAL(2,2)):
decimal(2,2)]
scala> sql("select cast('1' as Decimal(2,3))")
org.apache.spark.sql.catalyst.parser.ParseException:
Decimal scale (3) cannot be greater than precision (2).
scala> sql("select cast('1' as Decimal(2,1))").head
res2: org.apache.spark.sql.Row = [1.0]
scala> sql("select cast('1' as Decimal(2,2))").head
res3: org.apache.spark.sql.Row = [null]
```
**After**
```scala
scala> sql("select cast('1' as Decimal(2,1))")
res0: org.apache.spark.sql.DataFrame = [CAST(1 AS DECIMAL(2,1)):
decimal(2,1)]
scala> sql("select cast('1' as Decimal(2,2))")
org.apache.spark.sql.catalyst.parser.ParseException:
Decimal scale (2) must be less than precision (2).
```
## How was this patch tested?
Pass the Jenkins tests (with a new testcase)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-15612
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13358.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 #13358
----
commit 03e76984fbf702e067ae3ee4b2aee88a0f94e23e
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2016-05-27T10:24:58Z
[SPARK-15612][SQL] Raise exception if decimal `scale` >= `precision`
----
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