GitHub user takuti opened a pull request:
https://github.com/apache/incubator-hivemall/pull/124
[HIVEMALL-157] Return empty list for uninitialized query handler
## What changes were proposed in this pull request?
Even though `to_ordered_list` allows (and ignores) NULL inputs, following
query fails due to NPE:
```sql
select to_ordered_list(null, null)
```
> Null Pointer Exception
This PR fixes the problem; now, the function returns empty list in case
that query handler is uninitialized because of NULL inputs:
> []
## What type of PR is it?
Bug Fix
## What is the Jira issue?
https://issues.apache.org/jira/browse/HIVEMALL-157
## How was this patch tested?
Manually tested on local and EMR Hive
## Checklist
(Please remove this section if not needed; check `x` for YES, blank for NO)
- [x] Did you apply source code formatter, i.e., `mvn formatter:format`,
for your commit?
- [x] Did you run system tests on Hive (or Spark)?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/takuti/incubator-hivemall
fix-to_ordered_list-npe
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-hivemall/pull/124.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 #124
----
commit 16bd8eb013f4284d0e975c3cc6abd0b90665cf35
Author: Takuya Kitazawa <[email protected]>
Date: 2017-10-30T09:01:30Z
Return empty list for uninitialized query handler
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