[Java] Support concating validity bits efficiently

[asfimport]

For scenarios when we need to concate vectors (like the scenario in ARROW-7048, and delta dictionary), we need a way to concat validity bits.

Currently, we have bit level API to read/write individual validity bit. However, it is not efficient , and we need a way to copy more bits at a time.

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

Related issues:

• [Java] Support concating vectors values in batch (blocks)

PRs and other links:

• GitHub Pull Request #5782

_{Note: This issue was originally created as ARROW-7072. Please see the migration documentation for further details.}

[asfimport]

Micah Kornfield / @emkornfield:
Issue resolved by pull request 5782
#5782