[HIVEMALL-142] Implement SingularizeUDF for English singular-ization

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.5.0
• Assignee: Takuya Kitazawa
• Reporter: Takuya Kitazawa
• Created: 28/Aug/17 02:15
• Updated: 09/Nov/17 03:33
• Resolved: 13/Sep/17 12:50

Description

Something like `singularize('movies')` => `'movie'` could be very useful in a combination of `tokenize()` for English NLP on Hivemall.

Implementation mostly relies on regexp as:

• Jave example: https://github.com/sundrio/sundrio/blob/master/codegen/src/main/java/io/sundr/codegen/functions/Singularize.java
• One of the most famous Python implementation https://github.com/clips/pattern/blob/master/pattern/text/en/inflect.py#L445-L623

Issue Links

• links to: GitHub Pull Request #110