[jira] [Created] (DRILL-5531) Nullable value vectors unnecessarily inherit from BaseDataValueVector

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

Paul Rogers created DRILL-5531:
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             Summary: Nullable value vectors unnecessarily inherit from BaseDataValueVector 
                 Key: DRILL-5531
                 URL: https://issues.apache.org/jira/browse/DRILL-5531
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.8.0
            Reporter: Paul Rogers
            Priority: Minor


Consider a typical nullable value vector: NullableVarCharVector. The members are:

{code}
  private final UInt1Vector bits = new UInt1Vector(bitsField, allocator);
  private final VarCharVector values = new VarCharVector(field, allocator);
{code}

Inheritance is defined as:

{code}
class NullableVarCharVector extends BaseDataValueVector ...
{code}

But, notice the members of {{BaseDataValueVector}}:

{code}
  protected DrillBuf data;
{code}

It is confusing that a nullable vector has a data buffer that is never used. Instead, the data is carried by the {{values}} member.

Improvements:

* Define a new {{BaseNullableVector}} class that does not extend {{BaseDataValueVector}}.
* Move the {{bits}} member to the new base class rather than declaring it anew in each generated class.
* Adjust member functions to match.




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