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https://issues.apache.org/jira/browse/KYLIN-2173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shaofeng SHI resolved KYLIN-2173.
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Resolution: Fixed
> push down limit leads to wrong answer when filter is loosened
> -------------------------------------------------------------
>
> Key: KYLIN-2173
> URL: https://issues.apache.org/jira/browse/KYLIN-2173
> Project: Kylin
> Issue Type: Bug
> Components: Storage - HBase
> Affects Versions: v1.5.4.1
> Reporter: Dayue Gao
> Assignee: Dayue Gao
> Fix For: v1.6.0
>
>
> To reproduce:
> {noformat}
> select
> test_kylin_fact.cal_dt
> ,sum(test_kylin_fact.price) as GMV
> FROM test_kylin_fact
> left JOIN edw.test_cal_dt as test_cal_dt
> ON test_kylin_fact.cal_dt = test_cal_dt.cal_dt
> where test_cal_dt.week_beg_dt in ('2012-01-01', '2012-01-20')
> group by test_kylin_fact.cal_dt
> limit 12
> {noformat}
> Kylin returns 5 rows, expect 12 rows.
> Root cause: filter condition may be loosened when we translate derived filter
> in DerivedFilterTranslator. If we push down limit, query server won't get
> enough valid records from storage. In the above example, 24 rows returned
> from storage, only 5 are valid.
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