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https://issues.apache.org/jira/browse/HIVE-2992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ruben de Vries updated HIVE-2992:
---------------------------------
Description:
Okay first off; I know JOIN + LATERAL VIEW together isn't working so I moved my
JOIN into a subquery and that makes the query work properly
However when I added a MAPJOIN hint for the JOIN in the subquery it will also
stop doing the reducer for the main query!
This only happens when there's a LATERAL VIEW in there though, if I remove the
LATERAL VIEW then the main query still get's a reducer to do grouping
Here's a gist: https://gist.github.com/2499436 Containing the queries and a PHP
script which you can run to execute the test case I'm using, which does;
- setup a database called hive_mapjoin
- setup tables
- load some test data
- do the selects
You'll need the https://github.com/rcongiu/Hive-JSON-Serde/downloads
json-serde-1.1-jar-with-dependencies.jar with it though and change the path ;)
I guess looking at the queries you guys can probally figure out a better
testcase, but maybe it's helpful :-)
Not sure if this is a bug or me doing something that just isn't supposed to be
working, but I can't seem to find any pointers that this wouldn't be
supported...
Here's another gist with the plan.xml: https://gist.github.com/2499658
was:
Okay first off; I know JOIN + LATERAL VIEW together isn't working so I moved my
JOIN into a subquery and that makes the query work properly
However when I added a MAPJOIN hint for the JOIN in the subquery it will also
stop doing the reducer for the main query!
This only happens when there's a LATERAL VIEW in there though, if I remove the
LATERAL VIEW then the main query still get's a reducer to do grouping
Here's a gist: https://gist.github.com/2499436 Containing the queries and a PHP
script which you can run to execute the test case I'm using, which does;
- setup a database called hive_mapjoin
- setup tables
- load some test data
- do the selects
You'll need the https://github.com/rcongiu/Hive-JSON-Serde/downloads
json-serde-1.1-jar-with-dependencies.jar with it though and change the path ;)
I guess looking at the queries you guys can probally figure out a better
testcase, but maybe it's helpful :-)
Not sure if this is a bug or me doing something that just isn't supposed to be
working, but I can't seem to find any pointers that this wouldn't be
supported...
> JOIN + LATERAL VIEW works, but + MAPJOIN and no longer get any results
> ----------------------------------------------------------------------
>
> Key: HIVE-2992
> URL: https://issues.apache.org/jira/browse/HIVE-2992
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.8.1
> Environment: ubuntu - hadoop 0.20.2-cdh3u0 - hive 0.8.1
> Reporter: Ruben de Vries
>
> Okay first off; I know JOIN + LATERAL VIEW together isn't working so I moved
> my JOIN into a subquery and that makes the query work properly
> However when I added a MAPJOIN hint for the JOIN in the subquery it will also
> stop doing the reducer for the main query!
> This only happens when there's a LATERAL VIEW in there though, if I remove
> the LATERAL VIEW then the main query still get's a reducer to do grouping
> Here's a gist: https://gist.github.com/2499436 Containing the queries and a
> PHP script which you can run to execute the test case I'm using, which does;
> - setup a database called hive_mapjoin
> - setup tables
> - load some test data
> - do the selects
> You'll need the https://github.com/rcongiu/Hive-JSON-Serde/downloads
> json-serde-1.1-jar-with-dependencies.jar with it though and change the path ;)
> I guess looking at the queries you guys can probally figure out a better
> testcase, but maybe it's helpful :-)
> Not sure if this is a bug or me doing something that just isn't supposed to
> be working, but I can't seem to find any pointers that this wouldn't be
> supported...
> Here's another gist with the plan.xml: https://gist.github.com/2499658
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