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ARROW-6580
[Java] Support comparison for unsigned integersARROW-6458
[Java] Remove value boxing/unboxing for ApproxEqualsVisitor
[Format] Add clarifications to Columnar.rst about the contents of "null" slots in Varbinary or List arrays
[Java] Make field vectors final explicitly
[Java] Make range equal visitor reusable
[Java] Improve the performance of DictionaryHashTable
[Java] Improve the dictionary builder API to return the position of the value in the dictionary
[Java] Support stable sort by stable comparators
[Java] Compare ArrowBufPointers by unsinged integersARROW-6266
[Java] Resolve the ambiguous method overload in RangeEqualsVisitor
[Java] There is no need to consider byte order in ArrowBufHasher
[Java] Provide a common interface for float4 and float8 vectors
[Java] Support vector rank operation
[Java] Extract set null method to the base class for fixed width vectors
[Java] Provide hash table based dictionary builder
[Java] Provide benchmarks to set IntVector with different methods
[Java] Support compare semantics for ArrowBufPointer
[Java] Extract a super interface for vectors whose elements reside in continuous memory segments
[Java] Unify the copyFrom and copyFromSafe methods for all vectors
[Java] Fix the set method of FixedSizeBinaryVector
[Java] Support vector deduplicate function
[Java] reduce branches in algo for first match in VectorRangeSearcher
[Java] Support compare and search operation for BaseRepeatedValueVector
[Java] Avoid creating new schema before IPC sending
[Java] Support iterating a vector by ArrowBufPointer
[Java] Efficiently compute hash code for ArrowBufPointer
[Java] Provide more hash algorithms
[Java] Extract copyFrom and copyFromSafe methods to ValueVector interface
[Java] Support range searcher
[Java] Open a document to track the API changes
[Java] Avoid resource leak in flight service
[Java] Variable width vectors' get methods should return null when the underlying data is null
[Java] Provide pointer to Arrow buffer
[Java] Support sort & compare for all variable width vectors
[Java] Redesign the dictionary encoder
[Java] Make ListVector and MapVector create reader lazily
[Java] Provide functionality to efficiently compute hash code for arbitrary memory segment
[Java] Remove duplicated logic in MapVector
[Java] Fix the get method of StructVector
[Java] Provide functionalities to efficiently determine if a validity buffer has completely 1 bits/0 bits
[Java] Provide dictionary builder
[Java] Support comparison & sort for more numeric types
[Java] Improve the readability and performance of BitVectorHelper#getNullCount
[Java] Revise the semantic of lastSet in ListVector
[Java] Support search operations for vector data
[Java] Extract the logic for vector data copying to the super classes
[Java] Support in-place vector sorting