[I] [Java] reduce heap footprint of ValueVectors [arrow-java]

["asfimport (via GitHub)" <gi...@apache.org>]

asfimport opened a new issue, #412:
URL: https://github.com/apache/arrow-java/issues/412

   In some scenarios, we hold lots of value vectors in memory eg. during join, aggregation. The heap analysis shows that the costs are as follows for a simple IntVector (used VisualVM on mac) :
   
    
   
   IntVector : 80 bytes
   
   vector.types.pojo.FieldType : 41 bytes
   
   vector.types.pojo.Field : 40 bytes
   
   IntReaderImpl : 28 bytes
   
    
   
   I'll use this Jira to track ways to reduce the heap usage.
   
    
   
   **Reporter**: [Pindikura Ravindra](https://issues.apache.org/jira/browse/ARROW-5482) / @pravindra
   #### Related issues:
   - [[Java] remove FieldReader from ValueVector](https://github.com/apache/arrow-java/issues/411) (is a parent of)
   - [[Java] add ValueVector constructors that take a Field object](https://github.com/apache/arrow/issues/21932) (is a parent of)
   
   <sub>**Note**: *This issue was originally created as [ARROW-5482](https://issues.apache.org/jira/browse/ARROW-5482). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*</sub>


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