GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/13449
[SPARK-15709][SQL] Prevent `freqItems` from raising
`UnsupportedOperationException: empty.min`
## What changes were proposed in this pull request?
Currently, `freqItems` raises `UnsupportedOperationException` on
`empty.min` usually when its `support` argument is high.
```scala
scala> spark.createDataset(Seq(1, 2, 2, 3, 3,
3)).stat.freqItems(Seq("value"), 2)
16/06/01 11:11:38 ERROR Executor: Exception in task 5.0 in stage 0.0 (TID 5)
java.lang.UnsupportedOperationException: empty.min
...
```
Also, the parameter checking message is wrong.
```
require(support >= 1e-4, s"support ($support) must be greater than 1e-4.")
```
This PR changes the logic to handle the `empty` case and also improves
parameter checking.
## 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-15709
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13449.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 #13449
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