Ruben de Vries created HIVE-2992:
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Summary: 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...
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