[BEAM-960] JdbcIO should infer coder when possible (such as via RowMapper)

• Type: Improvement
• Status: Resolved
• Priority: P3
• Resolution: Fixed
• Fix Version/s: Missing
• Component/s: io-java-jdbc
• Assignee: Unassigned
• Reporter: Kenneth Knowles
• Created: 10/Nov/16 21:08
• Updated: 13/Jan/22 21:52
• Resolved: 30/Nov/21 15:06

Description

There are a few ways that we typically do this:

1. Inspect the static args of the class implementing RowMapper to determine the output type, then consult the coder registry. This method is more limited and not lambda-friendly.
2. For the a "functional interface" version, like RowMapper that allows setting the output type descriptor.
3. Also provide an abstract class-based version, for example accepting a SimpleFunction that will automatically have a rich output type descriptor.

Issue Links

• relates to: BEAM-1675 deprecate withCoder() in JdbcIO
• links to: GitHub Pull Request #15954