[Java] Support vector deduplicate function

[asfimport]

Remove adjacent deduplicated elements from a vector. This function can be used, for example, in finding distinct values, or in compressing the vector data.

Reporter: Liya Fan / @liyafan82
Assignee: Liya Fan / @liyafan82

Related issues:

• [Java] Resolve the ambiguous method overload in RangeEqualsVisitor (is blocked by)

PRs and other links:

• GitHub Pull Request #4993

_{Note: This issue was originally created as ARROW-6113. Please see the migration documentation for further details.}

[asfimport]

Micah Kornfield / @emkornfield:
Issue resolved by pull request 4993
#4993