apache / incubator-hivemall / 693

42%

Build Type

push

travis-ci

Committed by Takuya Kitazawa

Commit Message

[HIVEMALL-157] Avoid Null Pointer Exception caused by uninitialized queue 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 queue 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

- [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)?

Author: Takuya Kitazawa <k.takuti@gmail.com>

Closes #124 from takuti/fix-to_ordered_list-npe.

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