[WIP] Unity catalog explorer

[misha-db]

Changes

Unity Catalog Features

Tree View

• Hierarchical browser: Catalogs → Schemas → Tables / Volumes / Functions → Columns
• Filterable by typing (filterOnType)
• Only visible when authenticated and extension is active

Node Types

• Catalog — name, tooltip with comment
• Schema — name, tooltip with comment
• Table — type badge (TABLE / VIEW / MATERIALIZED_VIEW), format (delta, parquet, …), tooltip with owner, timestamps, comment; expandable to columns
• Volume — type badge (MANAGED / EXTERNAL), tooltip with owner, comment
• Function — full name in tooltip
• Column — name, data type, nullable indicator (key icon for non-nullable), comment

Context Menu Actions

• Copy — copies full qualified name (e.g. catalog.schema.table) for all nodes; copies just column name for columns
• Copy storage location — copies storage path for tables/volumes that have one
• Copy view SQL — copies view definition SQL for views and materialized views
• Open in Databricks — opens the item in the Databricks Explore UI in a browser (not available for columns)
• Refresh — re-fetches a specific node and its children (not available for columns)

Toolbar

• Refresh button — refreshes the entire Unity Catalog tree

Error Handling

• Error nodes displayed inline when a catalog/schema/table listing fails

Tests

UnityCatalogTreeDataProvider.test.ts

[github-actions]

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Trigger:
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Inputs:

• PR number: 1871
• Commit SHA: c7e1972d29c9339ba8ffa2eaa1d63f136bcc02b6

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