GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/17251
[SPARK-19910][SQL] `stack` should not reject NULL values due to type
mismatch
## What changes were proposed in this pull request?
Since `stack` function generates a table with nullable columns, it should
allow mixed null values.
```scala
scala> sql("select stack(3, 1, 2, 3)").printSchema
root
|-- col0: integer (nullable = true)
scala> sql("select stack(3, 1, 2, null)").printSchema
org.apache.spark.sql.AnalysisException: cannot resolve 'stack(3, 1, 2,
NULL)' due to data type mismatch: Argument 1 (IntegerType) != Argument 3
(NullType); line 1 pos 7;
```
## How was this patch tested?
Pass the Jenkins with a new test case.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-19910
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17251.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 #17251
----
commit 26828d57fe6faf26ccc36fa83f7686436f99f767
Author: Dongjoon Hyun <[email protected]>
Date: 2017-03-10T21:09:18Z
[SPARK-19910][SQL] `stack` should not reject NULL values due to type
mismatch
----
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