Ma Gang created KYLIN-3797:
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Summary: Too many or filters may break Kylin server when flatting
filter
Key: KYLIN-3797
URL: https://issues.apache.org/jira/browse/KYLIN-3797
Project: Kylin
Issue Type: Improvement
Components: Query Engine
Reporter: Ma Gang
Assignee: Ma Gang
Kylin needs to convert filter into a flat format, like: OR(AND(f1,f2),
AND(f3,f4,f5)…) , so that Kylin can build HBase scan/filter accordingly, but
when there are too many or filters in query, like: AND(OR(f1,f2,...,f1000),
OR(g1,g2,...,g1000), OR(h1,h2,...,h1000)), then the generated flat filter size
will be 1000*1000*1000=1 billion, the flatting process will cause Kylin server
OOM.
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