MakeArrayOfNull reuses a single buffer of 0 for all buffers in the array it creates. It could be extended to reuse that same buffer for all buffers in multiple arrays. This optimization will make RecordBatchProjector and ConcatenateTablesWithPromotion more memory efficient

Reporter: Ben Kietzman / @bkietz

Related issues:

• [C++] Kernel to select subset of fields of a StructArray (is related to)

PRs and other links:

• GitHub Pull Request #12116

_{Note: This issue was originally created as ARROW-7051. Please see the migration documentation for further details.}