[#12116] improvement(client-python): Add view create/drop operations

[kevinw66]

What changes were proposed in this pull request?

• Extend RelationalCatalog with ViewCatalog.
• Add as_view_catalog, create_view, and drop_view.
• Add request and response DTOs for view creation.
• Add view-specific REST error handling.
• Generalize the entity namespace helper for table and view operations.
• Add corresponding unit and integration tests.

Why are the changes needed?

The Python client currently lacks support for view create/drop operations. These changes allow users to create and drop views through the Python client.

Fix: #12116

Does this PR introduce any user-facing change?

Yes. Python client users can now create and drop views through RelationalCatalog.as_view_catalog().

How was this patch tested?

Added unit tests for request and response validation, REST error handling, and view create/drop operations.

Added integration tests covering view creation, duplicate creation, view deletion, and deletion of nonexistent views.

[github-actions]

Code Coverage Report

Overall Project	67.78%	🟢
Files changed	No Java source files changed	-

Module	Coverage
aliyun	1.72%	🔴
api	47.82%	🟢
authorization-common	85.96%	🟢
aws	42.04%	🟢
azure	2.47%	🔴
catalog-common	9.92%	🔴
catalog-fileset	79.74%	🟢
catalog-glue	66.91%	🟢
catalog-hive	79.4%	🟢
catalog-jdbc-common	45.7%	🟢
catalog-jdbc-doris	81.72%	🟢
catalog-jdbc-mysql	79.33%	🟢
catalog-jdbc-postgresql	83.39%	🟢
catalog-jdbc-starrocks	79.16%	🟢
catalog-kafka	77.01%	🟢
catalog-lakehouse-generic	59.18%	🟢
catalog-lakehouse-hudi	79.1%	🟢
catalog-lakehouse-iceberg	85.93%	🟢
catalog-lakehouse-paimon	84.23%	🟢
catalog-model	77.72%	🟢
cli	44.5%	🟢
client-java	78.27%	🟢
common	51.95%	🟢
core	82.55%	🟢
filesystem-hadoop3	77.28%	🟢
flink	0.0%	🔴
flink-common	47.09%	🟢
flink-runtime	0.0%	🔴
gcp	14.12%	🔴
hadoop-auth	68.0%	🟢
hadoop-common	12.7%	🔴
hive-metastore-common	53.4%	🟢
iceberg-common	64.65%	🟢
iceberg-rest-server	74.91%	🟢
idp-basic	86.02%	🟢
integration-test-common	0.0%	🔴
jobs	66.17%	🟢
lance-common	20.67%	🔴
lance-rest-server	64.84%	🟢
lineage	53.02%	🟢
optimizer	83.17%	🟢
optimizer-api	21.95%	🔴
server	86.05%	🟢
server-common	76.12%	🟢
spark	28.57%	🔴
spark-common	46.01%	🟢
tencent	69.84%	🟢
trino-connector	40.29%	🟢

[kevinw66]

@jerryshao @mchades Could you help review this? Thanks!

[Copilot]

Pull request overview

This PR adds view create/drop support to the Gravitino Python client’s relational catalog, introducing view-specific DTOs and REST error handling and expanding tests to cover the new functionality.

Changes:

• Extend RelationalCatalog to implement ViewCatalog and add as_view_catalog(), create_view(), and drop_view().
• Add view REST DTOs (ViewCreateRequest, ViewResponse) and a view-specific REST error handler.
• Add unit and integration tests for view create/drop behavior and error handling.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
clients/client-python/gravitino/client/relational_catalog.py	Implements ViewCatalog on RelationalCatalog and adds view create/drop REST calls plus shared namespace/path helpers.
clients/client-python/gravitino/dto/requests/view_create_request.py	Adds DTO for view creation requests, including validation and representation (de)serialization.
clients/client-python/gravitino/dto/responses/view_response.py	Adds DTO for view operation responses with validation.
clients/client-python/gravitino/exceptions/handlers/view_error_handler.py	Adds view-specific REST error handling and exception mapping.
clients/client-python/tests/unittests/test_relational_catalog.py	Adds unit tests for as_view_catalog, create_view, and drop_view.
clients/client-python/tests/unittests/test_error_handler.py	Adds unit tests for the new VIEW_ERROR_HANDLER.
clients/client-python/tests/unittests/dto/requests/test_view_create_request.py	Adds unit tests for ViewCreateRequest validation and JSON serialization.
clients/client-python/tests/unittests/dto/responses/test_view_response.py	Adds unit tests for ViewResponse validation and round-trip serialization.
clients/client-python/tests/integration/test_relational_catalog.py	Adds integration tests for view creation, duplicate creation, deletion, and deletion of nonexistent views.

[jerryshao]

Overall LGTM, just some minor issues.

[kevinw66]

Overall LGTM, just some minor issues.

Thanks! Just updated.