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

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Details

Type: New Feature
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 1.3.0, 2.0.0
Component/s: UDF
Labels:
None

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