fengYu created KYLIN-2286:
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Summary: global snapshot table for one cube
Key: KYLIN-2286
URL: https://issues.apache.org/jira/browse/KYLIN-2286
Project: Kylin
Issue Type: Improvement
Reporter: fengYu
Assignee: fengYu
I current version, Kylin build a snapshot table for a segment and isolate with
each other in the same cube, even though some segments share the same snapshot
table storage .
I some scene， we need global snapshot table for one cube, such as we has a cube
with snapshot table,ID is PK，the first day, the table look like:
id name
1 A
2 B
3 C
the query 'select name, count(1) from fact join dimension group by name' get
result:
A xx
B xx
C xx
the next day(segment), lookup table modified, it looks like :
id name
1 A
2 D
3 E
the same query return :
A xx
B xx
C xx
D xx
E xx
However B and D, C and E has the same ID, we need the newest result. so a
global snapshot table shared by all segments which has always the newest values
is needed.
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