Zhong Yanghong created KYLIN-3491:
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Summary: Improve the cube building process when using global
dictionary
Key: KYLIN-3491
URL: https://issues.apache.org/jira/browse/KYLIN-3491
Project: Kylin
Issue Type: Improvement
Reporter: Zhong Yanghong
Assignee: Zhong Yanghong
By current cubing process, if the global dictionary is very large, since the
raw data records are unsorted, it's hard to encode raw values into ids for the
input of bitmap due to frequent swap of the dictionary slices. We need a
refined process. The idea is as follows:
# for each source data block, there will be a mapper generating the distinct
values & sort them
# encode the sorted distinct values and generate a shrunken dict for each
source data block.
# when building base cuboid, use the shrunken dict for each source data block
for encoding.
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