[DRILL-345] Addition of a genericUDF/reflectUDF

• Type: Improvement
• Status: Reviewable
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.5.0
• Fix Version/s: Future
• Assignee: Mehant Baid
• Reporter: Yash Sharma
• Created: 18/Jan/14 07:55
• Updated: 26/Feb/19 00:09

Description

Add genericUDF/reflectUDF that will allow users to use methods from Java directly, instead having to write a UDF wrapper on top of existing Java method.
Usage:

SELECT reflect("java.lang.String", "valueOf", 1),
       reflect("java.lang.String", "isEmpty"),
       reflect("java.lang.Math", "max", 2, 3),
       reflect("java.lang.Math", "min", 2, 3),
       reflect("java.lang.Math", "round", 2.5),
       reflect("java.lang.Math", "exp", 1.0),
       reflect("java.lang.Math", "floor", 1.9)
FROM src LIMIT 1;

1   true    3   2   3   2.7182818284590455  1.0