fix: incremental append and partition_by support for Iceberg Python

[akmalsoliev]

Description

• Add incremental append strategy for Iceberg Python models using INSERT INTO instead of falling through to CREATE OR REPLACE (full refresh)
• Support partition_by config in Python models for both full refresh (PARTITIONED BY clause in CREATE OR REPLACE) and incremental append (Iceberg partition evolution via ALTER TABLE ADD/DROP PARTITION FIELD)
• Guard iceberg/s3tables schema change temp table creation with language != 'python' check to prevent SQL-only code from running in Python models
• Remove silent error fallback (CREATE TABLE IF NOT EXISTS) in favor of proper error propagation with traceback

Checklist

• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the CHANGELOG.md and added information about my change to the "dbt-glue next" section.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[akmalsoliev]

Hey @yotahk,
took a look and understood what you mean, the fix has been implemented, also created tests, but they shouldn't be added as it doesn't render dbt/include/glue/macros/materializations/python/python_utils.sql, generated with Claude Code for TDD.
Thanks,
Akmal

[yotahk]

thanks, will take a look next week.

[akmalsoliev]

thanks, will take a look next week.

Hey @yotahk,
could we run CI to see if this works? Wanted to see if integration tests work

[akmalsoliev]

Hey @yotahk, just noticed that you run the CI, fixed the indentation error.

[yotahk]

Thanks for the update, I kicked the CI again. Let's see...

[akmalsoliev]

Thanks for the update, I kicked the CI again. Let's see...

Hey @yotahk, everything looks ok?

If yes, I'll remove the test file and update the changelog

[yotahk]

Adding one comment. Also, would you update CHANGELOG.md?

[akmalsoliev]

@yotahk all done

[yotahk]

@akmalsoliev Would you also fix this too?

created tests, but they shouldn't be added as it doesn't render dbt/include/glue/macros/materializations/python/python_utils.sql, generated with Claude Code for TDD.

[akmalsoliev]

@akmalsoliev Would you also fix this too?

created tests, but they shouldn't be added as it doesn't render dbt/include/glue/macros/materializations/python/python_utils.sql, generated with Claude Code for TDD.

yeah, mb, skipped that.

[akmalsoliev]

hey @yotahk, pinging to see if there are any updates.

[yotahk]

Hey sorry I didn't have much time to review last week. Diff looks good to me, kicked CI.

[yotahk]

Merged, thanks for your patience.