[jira] [Assigned] (DRILL-2088) BitVector.Mutator.setValueCount() fails with invalid buffer access

["Venki Korukanti (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-2088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Venki Korukanti reassigned DRILL-2088:
--------------------------------------

    Assignee: Venki Korukanti

> BitVector.Mutator.setValueCount() fails with invalid buffer access
> ------------------------------------------------------------------
>
>                 Key: DRILL-2088
>                 URL: https://issues.apache.org/jira/browse/DRILL-2088
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: Venki Korukanti
>            Assignee: Venki Korukanti
>
> Run the following physical plan:
> {code}
> {
>     head:{
>         type:"APACHE_DRILL_PHYSICAL",
>         version:"1",
>         generator:{
>             type:"manual"
>         }
>     },
>     graph:[
>         {
>             @id:1,
>             pop:"mock-scan",
>             url: "http://apache.org",
>             entries:[
>                 {records: 100, types: [
>                   {name: "blue", type: "BIT", mode: "REQUIRED"},
>                   {name: "red", type: "BIGINT", mode: "REQUIRED"},
>                   {name: "green", type: "INT", mode: "OPTIONAL"}
>                 ]}
>             ]
>         },
>         {
>             @id:2,
>             child: 1,
>             pop:"selection-vector-remover"
>         },
>         {
>             @id: 3,
>             child: 2,
>             pop: "screen"
>         }
>     ]
> }
> {code}
> It fails with:
> {code}
> Failure while running fragment., index: 0, length: 8192 (expected: range(0, 1024))
> {code}
> Couple of issues:
> 1. We don't transfer valueCapacity as part of TransferPair.transfer(). This causes the vector that got the buffers to have 0 as valueCapacity. During the realloc of vector that got the buffer, we rely on valueCapacity to decide whether to realloc or not.
> 2. When BitVector.Mutator.setValueCount() is called we try to reallocate the buffer as the valueCapacity is zero. As part of realloc, we allocate a buffer of size 1028bytes and try to copy the existing buffer. Problem is existing buffer has size more than 1028bytes and we fail in copying. 



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