feat: add column with load from db

[edwinjosechittilappilly]

This pull request introduces support for specifying whether a table column's default value should be loaded from global variables using a new load_from_db attribute in the Column schema. It also adds a demo component and comprehensive tests to showcase and validate this functionality, ensuring both static and dynamic defaults are handled correctly.

Schema enhancements:

• Added a new boolean field load_from_db to the Column model in src/backend/base/langflow/schema/table.py, allowing columns to specify if their default should be loaded from global variables.

Component and demo:

• Implemented TableSchemaDemoComponent in src/backend/tests/unit/components/data/table_schema_demo_component.py to demonstrate and test table columns with the load_from_db attribute, including logic for processing table data and extracting schema info.

Testing:

• Added a dedicated test suite in src/backend/tests/unit/components/data/test_table_schema_demo_component.py to validate the demo component's behavior, including initialization, schema configuration, data loading (with various row types), output methods, and integration for serialization and schema correctness.
• Created additional tests in src/backend/tests/unit/components/data/test_table_loader_component.py for further validation of the demo component and schema serialization, ensuring robustness and compatibility.
• Expanded src/backend/tests/unit/io/test_table_schema.py with tests for the load_from_db attribute, covering default values, explicit settings, and mixed column configurations.

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch table_global_variable

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud