GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/10504
[SPARK-12549][SQL] Take Option[Seq[DataType]] in UDF input type
specification.
In Spark we allow UDFs to declare its expected input types in order to
apply type coercion. The expected input type parameter takes a Seq[DataType]
and uses Nil when no type coercion is applied. It makes more sense to take
Option[Seq[DataType]] instead, so we can differentiate a no-arg function vs
function with no expected input type specified.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-12549
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10504.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 #10504
----
commit 4f03904bc54ae591afb8f097a7f3da2fa12fd989
Author: Reynold Xin <[email protected]>
Date: 2015-12-29T08:25:23Z
[SPARK-12549][SQL] UDFs' input type specification should take
Option[Seq[DataType]] rather than Seq[DataType]
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