[DISCUSSION] ValueVectors Replacement

This feature request has been transcribed from messages posted in #2412 and to the mailing list in the first week of January 2021. The topic is what might replace the current memory structures used for data, ValueVectors.

Start by reading the discussion transcribed from #2412 and the Apache Drill mailing-list messages from the first week of January 2021. The issue does not name files, tests, an entry point, a proposed replacement, or criteria for completion, so the intended scope and definition of done must be established before implementation.

Written by the indexing model from the issue text.