add null island check

[tdikland]

Changes

Add new geo check: is_not_null_island.

Linked issues

Resolves #603

Tests

• manually tested
• added unit tests
• added integration tests
• added end-to-end tests
• added performance tests

[Copilot]

Pull Request Overview

Adds a new geospatial row check is_not_null_island to flag geometries at the “Null Island” (POINT(0 0)), with corresponding tests, benchmarks, and documentation updates.

• Introduces is_not_null_island in geo/check_funcs with rule registration
• Adds integration and performance tests, and YAML/MDX examples
• Updates docs to list and demonstrate the new check

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/resources/all_row_geo_checks.yaml	Adds is_not_null_island to the all-geo-checks YAML.
tests/perf/test_apply_checks.py	Adds a benchmark for is_not_null_island.
tests/integration/test_row_checks_geo.py	Adds an integration test verifying behavior and error message for is_not_null_island.
tests/integration/test_apply_checks.py	Adds is_not_null_island to the “all geo checks” application test (string and Column inputs).
src/databricks/labs/dqx/geo/check_funcs.py	Implements and registers is_not_null_island.
docs/dqx/docs/reference/quality_checks.mdx	Documents the new check and adds examples; fixes a table row formatting issue.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull Request Overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[ghanse]

LGTM