[jira] [Created] (HIVE-6016) Hadoop23Shims has a bug in listLocatedStatus impl.

["Sushanth Sowmyan (JIRA)" <ji...@apache.org>]

Sushanth Sowmyan created HIVE-6016:
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             Summary: Hadoop23Shims has a bug in listLocatedStatus impl.
                 Key: HIVE-6016
                 URL: https://issues.apache.org/jira/browse/HIVE-6016
             Project: Hive
          Issue Type: Bug
          Components: Shims
    Affects Versions: 0.13.0
            Reporter: Sushanth Sowmyan
            Assignee: Prasanth J


Prashant and I discovered that the implementation of the wrapping Iterator in listLocatedStatus at https://github.com/apache/hive/blob/2d2f89c21618341987c1257a88691981f1f606c7/shims/src/0.23/java/org/apache/hadoop/hive/shims/Hadoop23Shims.java#L350-L393 is broken.

Basically, if you had files (a,b,_s) , with a filter that is supposed to filter out _s, we expect an output result of (a,b). Instead, we get (a,b,null), with hasNext looking at the next value to see if it's null, and using that to decide if it has any more entries, and thus, (a,b,_s) becomes (a,b).

The problem with this approach, however, is that if you have an underlying (a,_s,b) and expect a (a,b) from it, you won't, because it translates to a (a,null,b), which then translates to a (a).

Furthermore, there's a boundary condition on the very first pick, which causes a (_s,a,b) to result in (_s,a,b), bypassing the filter, and thus, we wind up with a resultant unfiltered (_s,a,b) which orc breaks on.




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