Propagate schema changes to child Iceberg tables in inheritance hierarchies

[priyanshujain]

Description

When alter table adds/drops columns on a parent Iceberg table, automatically apply the same schema changes to child Iceberg tables. This ensures field_id mappings are synced across the inheritance hierarchy.

Fixes #6 "missing field for column" errors when querying child tables after parent schema modifications.

Reference Screenshot

Checklist

• I have tested my changes and added tests if necessary
• I updated documentation if needed
• I confirm that all my commits are signed off (DCO)

[sfc-gh-mslot]

Nice. Thanks for doing this. Would it be possible to add some tests?

[priyanshujain]

@sfc-gh-mslot I’ve added a schema propagation test with three cases - adding a column, renaming a column, and dropping the column.

[sfc-gh-okalaci]

Thanks @priyanshujain for the contribution.

We added DCO (https://developercertificate.org/) to our repo. The new PRs will inform you via the PR templates, but your PR pre-dates that.

Do you mind following the DCO part from this: https://github.com/Snowflake-Labs/pg_lake/blob/main/.github/pull_request_template.md

Thanks!

[priyanshujain]

Do you mind following the DCO part?

@sfc-gh-okalaci I have completed it.

[priyanshujain]

@sfc-gh-mslot / @sfc-gh-okalaci Could you please review this?

[priyanshujain]

@sfc-gh-mslot I fixed the CI failure issues that occurred due to code formatting.

[sfc-gh-mslot]

Nice contribution, thanks! Will be merged via #76