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https://issues.apache.org/jira/browse/DRILL-6172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16375191#comment-16375191
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ASF GitHub Bot commented on DRILL-6172:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/drill/pull/1124


> setValueCount of VariableLengthVectors throws IOB exception when called with 
> 0 value after clearing vectors
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-6172
>                 URL: https://issues.apache.org/jira/browse/DRILL-6172
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Data Types
>            Reporter: Sorabh Hamirwasia
>            Assignee: Sorabh Hamirwasia
>            Priority: Major
>              Labels: ready-to-commit
>             Fix For: 1.13.0
>
>
> For VariableLengthVectors when we call *setValueCount* explicitly after 
> clearing off the vector memory then it throws IOB exception. Normally 
> *setValueCount* is not required to be called explicitly after clear, since 
> getValueCount will return correct information. But if called it currently 
> throws IOB which should not be the case.
> The reason being when clear is called then it releases both offsetVector and 
> dataVector memory(or DrillByteBuf). Later when setValueCount is called then 
> it tries to get current value in offset vector at that valueCount index and 
> fails since the length of offset vector is zero. [Reference to 
> code|https://github.com/apache/drill/blob/master/exec/vector/src/main/codegen/templates/VariableLengthVectors.java#L703].



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