[KYLIN-2049] Incorrect AVG result with NULL measure values

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: v2.4.0
• Component/s: Query Engine
• Assignee: Unassigned
• Reporter: liyang
• Created: 25/Sep/16 00:49
• Updated: 14/Sep/18 01:53
• Resolved: 14/Sep/18 01:52

Description

Thanks to Itay. From - http://stackoverflow.com/questions/39664918/apache-kylin-null-value-measures-become-zeros

I'm trying to build a Kylin Cube that will get me the Average of a SmallInt nullable column Col1. I expect any null value to not be counted towards this average. When I work on my table in Hive this is exactly the result that I'm getting when applying the AVG function. However when I build the cube in Kylin on top of this table all the null values in my measurements columns are becoming zeros and then counted towards the calculation of the AVG. Is there a way to force Kylin to treat nulls as nulls?

Issue Links

• is related to: KYLIN-3392 Support NULL value in Sum, Max, Min Aggregation
• relates to: KYLIN-3359 Support sum(expression) if possible