Mapper and Linq: handle NULLs efficiently at the client level

Description

This is similar to JAVA-473. Ultimately this will get resolved on the server side in CASSANDRA-7304 where the server can handle NULLs in a special way. However this makes sense on the client side as well as it would send less mutation traffic to the server. Also it would allow users that suffer a lot because of the NULL behavior prior to C* 2.2.

Environment

None
Done

Assignee

Unassigned

Reporter

Jeremy Hanna

Labels

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PM Priority

A

Fix versions

External issue ID

None

Doc Impact

None

Reviewer

None

Pull Request

None

Epic Link

None

Sprint

C# P-NEXT

Pull Requests

None

Size

None

Components

Priority

Major