[KYLIN-2765] Eliminate restriction on Global Dictionary of Dim columns

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Component/s: Job Engine, Metadata, Query Engine
• Labels: scope
• Assignee: Dong Li
• Reporter: Roger Shi
• Created: 28/Jul/17 07:09
• Updated: 23/Sep/17 01:21
• Resolved: 23/Sep/17 01:21

Description

Cube dimension column is not allow to be in accurate-count-distinct measure. Global Dictionary encoding is a kind of dict in metadata. Dict encoding is created for dim at the beginning, so Global Dictionary is a special one for measure.

To eliminate the restriction, there're two possible ways in my view. One is move Global Dictionary metadata out of dict section to a new section such as "measure dict" (not there now, create a new one). The other way is handle Global Dictionary differently in both cubing engine and query engine.

There might be other better methods. Let's discuss here and find a good way out.

Issue Links

• duplicates: KYLIN-2679 Report error when a dimension using "dict" encoding and also configured Global dictionary for "distinct_count" measure