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https://issues.apache.org/jira/browse/SPARK-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust updated SPARK-1694:
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Priority: Minor (was: Major)
> Simplify ColumnBuilder/Accessor class hierarchy
> -----------------------------------------------
>
> Key: SPARK-1694
> URL: https://issues.apache.org/jira/browse/SPARK-1694
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.0.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
> Priority: Minor
> Fix For: 1.1.0
>
>
> Current {{ColumnBuilder/Accessor}} class hierarchy design was largely
> refactored from the in-memory columnar storage component of Shark. Code
> related to null values and compression were factored into
> {{NullableColumnBuilder/Accessor}} and {{CompressibleColumnBuilder/Accessor}}
> and then mixed in as stackable traits. The drawback is:
> # Interactions among these classes were unnecessarily complicated and error
> prone.
> # Flexibility provided by this design now seems useless
> To simplify this, we can merge {{CompressibleColumnBuilder/Accessor}} and
> {{NullableColumnBuilder/Accessor}} into {{NativeColumnBuilder/Accessor}},
> simply hard code null value processing and compression logic together.
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