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https://issues.apache.org/jira/browse/IMPALA-11008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xianqing He updated IMPALA-11008:
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Summary: Invalid to propagate inferred predicates into the nullable side of
an outer join (was: Incorrect to propagate inferred predicates into a plan
subtree that is on the nullable side of an outer join)
> Invalid to propagate inferred predicates into the nullable side of an outer
> join
> --------------------------------------------------------------------------------
>
> Key: IMPALA-11008
> URL: https://issues.apache.org/jira/browse/IMPALA-11008
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Reporter: Xianqing He
> Assignee: Xianqing He
> Priority: Major
>
> {code:java}
> Query: explain select * from (
> select case when id is not null and some_nulls is null then true else null
> end a from (select straight_join t1.id, t2.some_nulls from
> functional.nullrows t1 left join functional.nullrows t2 on t1.id=t2.id) t)t
> where a is not null
> Max Per-Host Resource Reservation: Memory=1.95MB Threads=3
> Per-Host Resource Estimates: Memory=66MB
> Codegen disabled by planner
> ""
> PLAN-ROOT SINK
> |
> 02:HASH JOIN [LEFT OUTER JOIN]
> | hash predicates: t1.id = t2.id
> | other predicates: CASE WHEN t1.id IS NOT NULL AND t2.some_nulls IS NULL
> THEN TRUE ELSE NULL END IS NOT NULL
> | row-size=39B cardinality=26
> |
> |--01:SCAN HDFS [functional.nullrows t2]
> | partitions=1/1 files=1 size=541B
> | predicates: CASE WHEN t2.id IS NOT NULL AND t2.some_nulls IS NULL THEN
> TRUE ELSE NULL END IS NOT NULL
> | row-size=26B cardinality=3
> |
> 00:SCAN HDFS [functional.nullrows t1]
> partitions=1/1 files=1 size=541B
> row-size=13B cardinality=26 {code}
> It is incorrect to propagate this inferred predicates into a plan subtree
> that is on the nullable side of an outer join.
>
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