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https://issues.apache.org/jira/browse/SPARK-24859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Johannes Mayer updated SPARK-24859:
-----------------------------------
Description:
I have two AVRO tables in Hive called FAct and DIm. Both are partitioned by a
common column called part_col. Now I want to join both tables on their id but
only for some of partitions.
If I use an inner join, everything works well:
{code:java}
select *
from FA f
join DI d
on(f.id = d.id and f.part_col = d.part_col)
where f.part_col = 'xyz'
{code}
In the sql explain plan I can see, that the predicate part_col = 'xyz' is also
used in the DIm HiveTableScan.
When I execute the same query using a left join the full dim table is scanned.
There are some workarounds for this issue, but I wanted to report this as a
bug, since it works on an inner join, and i think the behaviour should be the
same for an outer join
was:
I have two AVRO tables in Hive called FAct and DIm. Both are partitioned by a
common column called part_col. Now I want to join both tables on their id but
only for some of partitions.
If I use an inner join, everything works well:
{code:java}
select *
from FA f
join DI d
on(f.id = d.id and f.part_col = d.part_col)
where f.part_col = 'xyz'
{code}
In the sql explain plan i can see, that the predicate part_col = 'xyz' is also
used in the DIm HiveTableScan.
When I execute the same query using a left join the full dim table is scanned.
There are some workarounds for this issue, but i wanted to report this as a
bug, since it works on an inner join, and i think the behaviour should be the
same for an outer join
> Predicates pushdown on outer joins
> ----------------------------------
>
> Key: SPARK-24859
> URL: https://issues.apache.org/jira/browse/SPARK-24859
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, SQL
> Affects Versions: 2.2.0
> Environment: Cloudera CDH 5.13.1
> Reporter: Johannes Mayer
> Priority: Critical
>
> I have two AVRO tables in Hive called FAct and DIm. Both are partitioned by a
> common column called part_col. Now I want to join both tables on their id but
> only for some of partitions.
> If I use an inner join, everything works well:
>
> {code:java}
> select *
> from FA f
> join DI d
> on(f.id = d.id and f.part_col = d.part_col)
> where f.part_col = 'xyz'
> {code}
>
> In the sql explain plan I can see, that the predicate part_col = 'xyz' is
> also used in the DIm HiveTableScan.
>
> When I execute the same query using a left join the full dim table is
> scanned. There are some workarounds for this issue, but I wanted to report
> this as a bug, since it works on an inner join, and i think the behaviour
> should be the same for an outer join
>
>
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