[KYLIN-976] Support Custom Aggregation Types

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: v1.3.0, v1.5.0
• Component/s: Job Engine, Query Engine
• Assignee: Hongbin Ma
• Reporter: Luke Han
• Created: 28/Aug/15 14:49
• Updated: 15/Jun/16 14:46
• Resolved: 07/Mar/16 02:25

Description

Currently, Kylin supports 6 basic aggregation measure functions:
Min/Max/Sum/Count/Avg/DistinctCount

But there are also many other cases require to support more complicate measure expression, for example:
COUNT(CASE WHEN so.ft = 'fv' THEN soi.sc ELSE NULL END) or Sum(if...)

Or even more complicated measures like TopN and RawRecords

To open this JIRA to tracking further implementation

Issue Links

• is depended upon by: KYLIN-1122 Kylin support detail data query from fact table
• is depended upon by: KYLIN-1186 Support precise Count Distinct using bitmap (under limited conditions)