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https://issues.apache.org/jira/browse/DRILL-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Rogers updated DRILL-5954:
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Summary: ListVector shadows "offsets" from BaseRepeatedValueVector (was:
ListVector derives from BaseRepeatedValueVector, shadows offsets)
> ListVector shadows "offsets" from BaseRepeatedValueVector
> ---------------------------------------------------------
>
> Key: DRILL-5954
> URL: https://issues.apache.org/jira/browse/DRILL-5954
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.8.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Minor
> Fix For: 1.13.0
>
>
> The Drill vector class {{ListVector}} derives from
> {{BaseRepeatedValueVector}}:
> {code}
> public class ListVector extends BaseRepeatedValueVector {
> private UInt4Vector offsets;
> ...
> {code}
> Note that the {{offsets}} member shadows a member of the same type in the
> super class:
> {code}
> public abstract class BaseRepeatedValueVector ... {
> protected final UInt4Vector offsets;
> ...
> {code}
> In Java, shadowing an existing field is considered bad practice as it is
> never clear which field any particular bit of code references.
> In this case, it appears to be that the {{ListVector}} version is simply a
> reference to the base class version. Perhaps because someone didn't
> understand {{protected}} mode in Java?
> {code}
> public ListVector(MaterializedField field, BufferAllocator allocator,
> CallBack callBack) {
> ...
> offsets = getOffsetVector();
> ...
> {code}
> A quick experiment shows that the {{ListVector}} version can simply be
> removed.
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