Daniel Bali created FLINK-1628:
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Summary: Strange behavior of "where" function during a join
Key: FLINK-1628
URL: https://issues.apache.org/jira/browse/FLINK-1628
Project: Flink
Issue Type: Bug
Affects Versions: 0.9
Reporter: Daniel Bali
Hello!
If I use the `where` function with a field list during a join, it exhibits
strange behavior.
Here is the sample code that triggers the error:
https://gist.github.com/balidani/d9789b713e559d867d5c
This example joins a DataSet with itself, then counts the number of rows. If I
use `.where(0, 1)` the result is (22), which is not correct. If I use
`EdgeKeySelector`, I get the correct result (101).
When I pass a field list to the `equalTo` function (but not `where`),
everything works again.
If I don't include the `groupBy` and `reduceGroup` parts, everything works.
Also, when working with large DataSets, passing a field list to `where` makes
it incredibly slow, even though I don't see any exceptions in the log (in DEBUG
mode).
Does anybody know what might cause this problem?
Thanks!
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