[IGNITE-15783] Mapper API and simple implementation.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha4
• Component/s: sql
• Labels: iep-54 ignite-3
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Andrey Mashenkov
• Reporter: Andrey Mashenkov
• Created: 20/Oct/21 13:31
• Updated: 12/Nov/21 10:09
• Resolved: 12/Nov/21 10:09

Description

Design Mapper API for user POJO classes for use in KvView and RecordView.

NB: Most likely, there is no need to have different interfaces for Key/Value/Record mappers
and the same implementation can be reused for all cases.

Let's

• Implement an IdentityMapper as a default one that binds the POJO field to the column with the same name.
• Implement a simple mapper that allows binding the POJO field to the column with a different name.
  Field <--> column mapping expected to be one-to-one function.

Issue Links

• is part of: IGNITE-15782 User POJO mapping.
• links to: GitHub Pull Request #424