GitHub user actuaryzhang opened a pull request:
https://github.com/apache/spark/pull/17017
[SPARK-19682][SparkR] Issue warning (or error) when subset method "[["
takes vector index
## What changes were proposed in this pull request?
The `[[` method is supposed to take a single index and return a column.
This is different from base R which takes a vector index. We should check for
this and issue warning or error when vector index is supplied (which is very
likely given the behavior in base R).
Currently I'm issuing a warning message and just take the first element of
the vector index. We could change this to an error it that's better.
## How was this patch tested?
new tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/actuaryzhang/spark sparkRSubsetter
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17017.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 #17017
----
commit 0f79df3162d9cc6cdfa0cfee0f3b2f0efa88ebaa
Author: actuaryzhang <[email protected]>
Date: 2017-02-21T18:38:11Z
add check for length of subset index
commit 66888b6ca30fdc76565fcaf60fdf98366a5b49c9
Author: actuaryzhang <[email protected]>
Date: 2017-02-21T18:57:09Z
update test
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