[HIVE-11103] Add banker's rounding BROUND UDF

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.0, 2.0.0
• Component/s: UDF
• Assignee: Alexander Pivovarov
• Reporter: Alexander Pivovarov
• Created: 24/Jun/15 23:19
• Updated: 16/Feb/16 23:51
• Resolved: 13/Aug/15 18:03

Description

Banker's rounding: the value is rounded to the nearest even number. Also known as "Gaussian rounding", and, in German, "mathematische Rundung".

Example

                  2 digits                2 digits
Unrounded    "Standard" rounding    "Gaussian" rounding
  54.1754      54.18                  54.18
 343.2050     343.21                 343.20
+106.2038    +106.20                +106.20 
=========    =======                =======
 503.5842     503.59                 503.58

Issue Links

• links to: https://reviews.apache.org/r/35902/