GitHub user mgaido91 opened a pull request:
https://github.com/apache/spark/pull/22391
[SPARK-25371][SQL][BACKPORT-2.3] struct() should allow being called with 0
args
## What changes were proposed in this pull request?
SPARK-21281 introduced a check for the inputs of `CreateStructLike` to be
non-empty. This means that `struct()`, which was previously considered valid,
now throws an Exception. This behavior change was introduced in 2.3.0. The
change may break users' application on upgrade and it causes `VectorAssembler`
to fail when an empty `inputCols` is defined.
The PR removes the added check making `struct()` valid again.
## How was this patch tested?
added UT
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mgaido91/spark SPARK-25371_2.3
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22391.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 #22391
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commit 66b6bd5b7e1538d60915b62fa1155dcd86f3411a
Author: Marco Gaido <marcogaido91@...>
Date: 2018-09-11T06:16:56Z
[SPARK-25371][SQL] struct() should allow being called with 0 args
SPARK-21281 introduced a check for the inputs of `CreateStructLike` to be
non-empty. This means that `struct()`, which was previously considered valid,
now throws an Exception. This behavior change was introduced in 2.3.0. The
change may break users' application on upgrade and it causes `VectorAssembler`
to fail when an empty `inputCols` is defined.
The PR removes the added check making `struct()` valid again.
added UT
Closes #22373 from mgaido91/SPARK-25371.
Authored-by: Marco Gaido <marcogaid...@gmail.com>
Signed-off-by: Wenchen Fan <wenc...@databricks.com>
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