liyang created KYLIN-3429:
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Summary: Have a default measure value to save storage space
Key: KYLIN-3429
URL: https://issues.apache.org/jira/browse/KYLIN-3429
Project: Kylin
Issue Type: Improvement
Reporter: liyang
The idea is from Alberto.
When a Cuboid is very sparse, like below:
||Dim1||Dim2||Measure||
|1|A|0|
|1|B|100|
|1|C|0|
|2|A|0|
|2|B|0|
|2|C|130|
It becomes beneficial to store only the non-zero lines and remember a default
measure value for the rest.
That is to only save the below lines, plus the default value 0.
||Dim1||Dim2||Measure||
|1|B|100|
|2|C|130|
However this comes with the assumption that all combinations of dimensions
exist in cuboid.
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