## Summary Surfaces the rich per-index metadata added in #3497 to the Python and Node.js language bindings. Closes #3495. New optional fields exposed on `IndexConfig` in both bindings: - `index_uuid` / `indexUuid` — UUID of the first index segment - `type_url` / `typeUrl` — protobuf type URL for the index - `created_at` / `createdAt` — creation timestamp (milliseconds since Unix epoch) - `num_indexed_rows` / `numIndexedRows` — rows covered by the index - `num_unindexed_rows` / `numUnindexedRows` — rows not yet indexed - `size_bytes` / `sizeBytes` — total index file size in bytes - `num_segments` / `numSegments` — number of index segments - `index_version` / `indexVersion` — on-disk format version - `index_details` / `indexDetails` — type-specific JSON details string All fields are `None`/`undefined` for remote tables (which don't yet surface this metadata through the server response). ## Changes - `python/src/index.rs`: extend `IndexConfig` pyclass; update `From` impl; update `__getitem__` - `python/python/lancedb/_lancedb.pyi`: add type hints for new fields - `python/python/tests/test_table.py`: new `test_index_config_fields` test - `nodejs/src/table.rs`: extend `IndexConfig` napi struct; update `From` impl - `nodejs/__test__/table.test.ts`: new test; update existing `toEqual` assertions to `expect.objectContaining` to accommodate new fields ## Test plan - [x] Python: `uv run --extra tests pytest python/tests/test_table.py::test_index_config_fields` - [x] Node.js: `pnpm test __test__/table.test.ts` 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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@lancedb/lancedb • Docs
@lancedb/lancedb / IndexConfig
Interface: IndexConfig
A description of an index currently configured on a column
Properties
columns
columns: string[];
The columns in the index
Currently this is always an array of size 1. In the future there may be more columns to represent composite indices.
createdAt?
optional createdAt: Date;
When the index was created.
undefined for remote tables or indices created before timestamps were tracked.
indexDetails?
optional indexDetails: any;
Index-type-specific details parsed as a JavaScript object.
Falls back to a raw string if JSON parsing fails. undefined for
remote tables or when details are unavailable.
indexType
indexType: string;
The type of the index
indexUuid?
optional indexUuid: string;
The UUID of the first segment of the index.
undefined for remote tables, which do not yet surface this.
indexVersion?
optional indexVersion: number;
The on-disk index format version.
undefined for remote tables.
name
name: string;
The name of the index
numIndexedRows?
optional numIndexedRows: number;
The number of rows indexed, across all segments.
undefined for remote tables.
numSegments?
optional numSegments: number;
The number of segments that make up the index.
undefined for remote tables.
numUnindexedRows?
optional numUnindexedRows: number;
The number of rows not yet covered by this index.
undefined for remote tables.
sizeBytes?
optional sizeBytes: number;
The total size in bytes of all index files across all segments.
undefined for remote tables or indices without size tracking.
typeUrl?
optional typeUrl: string;
The protobuf type URL, a precise type identifier for the index.
undefined for remote tables.