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From "Paul Rogers (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DRILL-5602) Repeated List Vector fails to initialize the offset vector
Date Thu, 17 Aug 2017 03:35:01 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paul Rogers resolved DRILL-5602.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 1.12.0

> Repeated List Vector fails to initialize the offset vector
> ----------------------------------------------------------
>
>                 Key: DRILL-5602
>                 URL: https://issues.apache.org/jira/browse/DRILL-5602
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.10.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>             Fix For: 1.12.0
>
>
> The code that allocates a new {{RepeatedListVector}} does not initialize the first offset
to zero as required:
> {code}
>   @Override
>   public void allocateNew(int valueCount, int innerValueCount) {
>     clear();
>     getOffsetVector().allocateNew(valueCount + 1);
>     getMutator().reset();
>   }
> {code}
> Since Netty does not zero-fill vectors, the result is vector corruption.
> If the code worked correctly, here is the behavior when writing to the first element
of the list:
> * Access the offset vector at offset 0. Should be 0.
> * Write the new value at that offset. Since the first offset is 0, the first value is
written at 0 in the value vector.
> * Write into offset 1 the value at offset 0 plus the length of the new value.
> But, the offset vector is not initialized to zero. Instead, offset 0 contains the value
16 million. Now:
> * Access the offset vector at offset 0. Value is 16 million.
> * Write the new value at that offset. Write at position 16 million. This requires growing
the value vector from its present size to 16 MB.



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