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https://issues.apache.org/jira/browse/HIVEMALL-121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16981420#comment-16981420
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ASF GitHub Bot commented on HIVEMALL-121:
-----------------------------------------
myui commented on pull request #216: [HIVEMALL-121] Add -libsvm formatting
option to feature_hashing UDF
URL: https://github.com/apache/incubator-hivemall/pull/216
## What changes were proposed in this pull request?
Add `-libsvm` formatting option for `feature_hashing
## What type of PR is it?
Improvement
## What is the Jira issue?
https://issues.apache.org/jira/browse/HIVEMALL-121
## How was this patch tested?
unit tests, manual tests on EMR
## How to use this feature?
```sql
select feature_hashing(array('aaa:1.0','aaa','bbb:2.0'), '-libsvm');
> ["4063537:1.0","4063537:1","8459207:2.0"]
select feature_hashing(array('aaa:1.0','aaa','bbb:2.0'), '-features 10
-libsvm');
> ["1:2.0","7:1.0","7:1"]
```
## Checklist
- [x] Did you apply source code formatter, i.e., `./bin/format_code.sh`, for
your commit?
- [x] Did you run system tests on Hive (or Spark)?
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> Add `-libsvm` formatting option for `feature_hashing`
> -----------------------------------------------------
>
> Key: HIVEMALL-121
> URL: https://issues.apache.org/jira/browse/HIVEMALL-121
> Project: Hivemall
> Issue Type: Improvement
> Reporter: Makoto Yui
> Assignee: Makoto Yui
> Priority: Minor
> Fix For: 0.6.0
>
>
> `-libsvm` option is expected that always outputs
> {code}(<index>:<value>)*{code}
> {code:sql}
> select feature_hashing(features, '-libsvm') from train;
> {code}
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