Commits on Sep 7, 2023

1. apacheGH-15187: [Java] Made reader initialization lazy and added ne… …

   …w `getTransferPair()` function that takes in a `Field` type (apache#34424)
   
   This PR closes apache#15187. `FieldReader` is being allocated directly in the constructor today, and this PR changes it such that the initialization becomes lazy. Additionally, a new function `getTransferPair(Field, Allocator)` is introduced so that a new `Field` method is not constructed each time `getTransferPair` is called on the Vector.
   
   1. Introduce a new `getTransferPair` method.
   2. Make initializing `FieldReader` lazy.
   
   Yes, some tests have been added to verify these changes.
   
   I am not 100% sure if there are any user facing changes.
   
   There should not be any breaking changes.
   * Closes: apache#15187
   
   Authored-by: Ramasai <[email protected]>
   Signed-off-by: David Li <[email protected]>

   

   rtadepalli authored and lriggs committed Sep 7, 2023
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2. Fix import

   

   lriggs committed Sep 7, 2023
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3. Fix imports

   

   lriggs committed Sep 7, 2023
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