[jira] [Updated] (DRILL-5385) Vector serializer fails to read saved SV2

["Paul Rogers (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-5385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul Rogers updated DRILL-5385:
-------------------------------
    Reviewer: Boaz Ben-Zvi

> Vector serializer fails to read saved SV2
> -----------------------------------------
>
>                 Key: DRILL-5385
>                 URL: https://issues.apache.org/jira/browse/DRILL-5385
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.8.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>             Fix For: 1.11.0
>
>
> Drill provides the {{VectorAccessibleSerializable}} class to write a record batch to a stream, and to read that batch from a stream. Record batches can carry an indirection vector (a so-called selection vector 2 or SV2).
> The code to write batches writes the SV2 to the stream. But, the code to deserialize batches initializes, but does not read, the SV2 from the stream.
> The result is that vector deserialization reads the wrong bytes and the saved values are corrupted on read.
> Note that this issue was found via unit testing. At present, the only production use of this code is in the external sort, which serializes batches without an indirection vector.



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