hongbin ma created KYLIN-1788:
---------------------------------
Summary: Allow arbitrary number of mandatory dimensions in one
aggregation group
Key: KYLIN-1788
URL: https://issues.apache.org/jira/browse/KYLIN-1788
Project: Kylin
Issue Type: Bug
Affects Versions: v1.5.2
Reporter: hongbin ma
Assignee: hongbin ma
To prevent one aggregation group containing too many combinations we apply a
check
{code:java}
if (mandatoryDims.size() + normalDimSize + hierarchySize + jointSize > maxSize)
{
context.addResult(ResultLevel.ERROR, "Aggregation group " +
index + " has too many dimensions");
continue;
}
{code}
however the formular fails to take into account the case where there're many
mandatory dimensions. For example, if we have 50 dimensions in a cube and we
only need the base cuboid, then what we want is a single aggregation group
containing all the dimensions, each of them being a mandatory.
since mandatory dimensions are more "encouraged", I suggest to remove counting
mandatory dimensions in the formula. the revised code will be:
{code:java}
if (normalDimSize + hierarchySize + jointSize > maxSize) {
context.addResult(ResultLevel.ERROR, "Aggregation group " +
index + " has too many dimensions");
continue;
}
{code}
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