Implement autorollback for <empty/> and <output/> changes

[jccampanero]

Impact

• Bug fix (non-breaking change which fixes expected existing functionality)
• Enhancement/New feature (adds functionality without impacting existing logic)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Currently, trying to rollback a changeset with either an <empty /> or <output /> change, is unsupported, the library raises liquibase.exception.RollbackImpossibleException.

Due to the nature of both type of changes Liquibase must support auto rollback for them.

This PR address the issue by providing a convenient implementation of the AbstractChange's createInverses method.

Fixes #4095.

Things to be aware of

Nothing.

Things to worry about

Nothing.

Additional Context

N/A.

[nvoxland]

Initial review:

Changes look right, thanks @jccampanero!

Things to be aware of:

• Nothing

Things to worry about:

• Nothing

[jccampanero]

You are welcome @nvoxland. My pleasure to help.

[jccampanero]

Thank you very much for providing the tests cases and updating the branch @MalloD12 Daniel.

[MalloD12]

Approved.

Review and testing results:

Thank you, @jccampanero for your changes. They look good to me. Below what I have done:

• Manual test performed: deploy empty and output changes, and them performed rollback to both of them successfully.
• Add change sets to our rollback integration tests, and they have been executed successfully.

Things to be aware of:

• None

Things to worry about:

• None

[MalloD12]

@AMBERMW13 - @adrian-velonis1 (cc: @mariochampion ) it would be nice if we can update our documentation to reflect these changes. I have created PD-3365 for it.

Thanks,
Daniel.

[jccampanero]

Approved.

Review and testing results:

Thank you, @jccampanero for your changes. They look good to me. Below what I have done:

• Manual test performed: deploy empty and output changes, and them performed rollback to both of them successfully.
• Add change sets to our rollback integration tests, and they have been executed successfully.

Things to be aware of:

• None

Things to worry about:

• None

Thank you very much Daniel.

[XDelphiGrl]

This PR implements the auto-rollback functionality for empty and output change types. Rollback operations involving empty or output change types will no longer throw the "no inverse" error dreaded by all who love Liquibase.

• New unit tests added.
• Functional and test harness executions passing.
• No additional testing necessary.

APPROVED