[PR] [python] Add predicate update for data evolution [paimon]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi opened a new pull request, #8413:
URL: https://github.com/apache/paimon/pull/8413

   ## Summary
   
   Adds a PyPaimon predicate-based data evolution update API for SQL-like `UPDATE ... SET ... WHERE ...` flows. The row-id discovery scan is aligned with #8411 by pinning the scan snapshot and forcing `global-index.search-mode=full` so matched updates include rows appended after a global index was created.
   
   ## Changes
   
   - Add `TableUpdate.new_predicate_builder()` and `update_by_predicate` for batch and stream updates.
   - Reuse the existing row-id partial-update write path after discovering matching `_ROW_ID` values.
   - Reject invalid predicate updates, including empty assignments and partition-column updates.
   - Add regression coverage for updating rows not covered by an existing BTree global index.
   - Refresh data evolution docs with Python predicate-update examples and `Tabs` / `TabItem` organization for batch and stream flows.
   
   ## Testing
   
   - [x] `./.venv/bin/python -m py_compile pypaimon/write/table_update.py pypaimon/tests/table_update_test.py`
   - [x] `./.venv/bin/python -m pyflakes pypaimon/write/table_update.py pypaimon/tests/table_update_test.py`
   - [x] `./.venv/bin/python -m pytest pypaimon/tests/table_update_test.py -q`
   - [x] `git diff --check`
   - [x] `yarn --cwd docs build`
   
   ## Notes
   
   `yarn --cwd docs build` still reports the existing global broken link warning for `/docs/master/concepts/overview`, but the build succeeds.


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Re: [PR] [python] Add predicate update for data evolution [paimon]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi merged PR #8413:
URL: https://github.com/apache/paimon/pull/8413


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