Kazuaki Ishizaki created SPARK-17915:

             Summary: Prepare ColumnVector implementation for UnsafeData
                 Key: SPARK-17915
                 URL: https://issues.apache.org/jira/browse/SPARK-17915
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.0.1, 2.0.0
            Reporter: Kazuaki Ishizaki

Current implementations of {{ColumnarVector}} are {{OnHeapColumnarVector}} and 
{{OffHeapColumnarVector}}, which are optimized for reading data from Parquet. 
If they get an array, an map, or an struct from a {{Unsafe}} related data 
structure, it is inefficient.
This JIRA prepares a new implementation {{OnHeapUnsafeColumnarVector}} that is 
optimized for reading data from a {{Unsafe}} related data structure.

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