feat: GetExecutionNodes API returns number of total and ended nodes

[yuechao-qin]

TL;DR

Added execution summary to graph execution state response to track node completion status (GET /api/executions/{id}/graph_execution_state).

What changed?

• Enhanced GetGraphExecutionStateResponse class with a required summary field of type ExecutionSummary
• Modified get_graph_execution_state method to populate the summary by counting node statuses
• Updated the dataclass to use kw_only=True for better parameter handling
• Fixed a method call from row.tuple() to row._tuple()
  • Received warning that the previous is deprecated with an older SQLAlchemy version.
• Added tests to verify the summary information is correctly calculated

How to test?

Run the updated tests in test_execution_nodes_api_service.py which verify:

• Empty graphs return appropriate summary values
• Direct container children are properly counted
• Complex nested graphs correctly calculate total nodes and ended nodes
• The has_ended flag is properly set based on execution state

Run the new test cases in tests/test_api_server_sql.py:

pytest tests/test_execution_nodes_api_service.py

Why make this change?

• Related to API Server - Add has_ended to the response of PieplineRunsService.list #87
• The UI uses this API (polling 5 seconds) to render node state/statuses. It need to know when a root execution node (run, subgraph) has ended.

[yuechao-qin]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat: GetExecutionNodes API returns number of total and ended nodes #99 👈 (View in Graphite)
• test: Add tests for GetGraphExecution API #98
• feat: API pipeline run get has execution summary #97
• feat: API pipeline run list has execution summary #96
• refactor: Function to get execution status stats #95
• feat: Model to track node states and has_ended flag #94
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

[Ark-kun]

>It need to know when a root execution node (run, subgraph) has ended.
Why does it need this info?