[jira] [Assigned] (ARROW-1463) [JAVA] Restructure ValueVector hierarchy to minimize compile-time generated code

["SIDDHARTH TEOTIA (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-1463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

SIDDHARTH TEOTIA reassigned ARROW-1463:
---------------------------------------

    Assignee: SIDDHARTH TEOTIA

> [JAVA] Restructure ValueVector hierarchy to minimize compile-time generated code
> --------------------------------------------------------------------------------
>
>                 Key: ARROW-1463
>                 URL: https://issues.apache.org/jira/browse/ARROW-1463
>             Project: Apache Arrow
>          Issue Type: Improvement
>            Reporter: Jacques Nadeau
>            Assignee: SIDDHARTH TEOTIA
>
> The templates used in the java package are very high mainteance and the if conditions are hard to track. As started in the discussion here: https://github.com/apache/arrow/pull/1012, I'd like to propose that we modify the structure of the internal value vectors and code generation dynamics.
> Create new abstract base vectors:
> BaseFixedVector
> BaseVariableVector
> BaseNullableVector
> For each of these, implement all the basic functionality of a vector without using templating.
> Evaluate whether to use code generation to generate specific specializations of this functionality for each type where needed for performance purposes (probably constrained to mutator and accessor set/get methods). Giant and complex if conditions in the templates are actually worse from my perspective than a small amount of hand written duplicated code since templates are much harder to work with. 



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