GitHub user marmbrus opened a pull request:
https://github.com/apache/spark/pull/9334
[SPARK-11377] [SQL] withNewChildren should not convert StructType to Seq
This is minor, but I ran into while writing Datasets and while it wasn't
needed for the final solution, it was super confusing so we should fix it.
Basically we recurse into `Seq` to see if they have children. This breaks
because we don't preserve the original subclass of `Seq` (and `StructType <:<
Seq[StructField]`). Since a struct can never contain children, lets just not
recurse into it.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/marmbrus/spark structMakeCopy
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9334.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 #9334
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commit b5c6f821856a728eec0b449e4e821d6db44a2e41
Author: Michael Armbrust <[email protected]>
Date: 2015-10-28T14:24:34Z
[SPARK-11377] [SQL] withNewChildren should not convert StructType to Seq
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