Will Jones 6219975222 perf: drop N+1 in RemoteTable::list_indices (#3535)
`RemoteTable::list_indices` currently makes one `/index/list/` call plus
one `/index/{name}/stats/` call per index just to recover `index_type`.

When the server returns `index_type` directly in the `/index/list/`
response, all enriched fields are used and the per-index stats fan-out
is skipped entirely. When `index_type` is absent (legacy servers), the
existing stats fallback runs as before. This is content-based: no
version header required.

## Changes

- `RemoteTable::parse_index_list_response` replaces the old split
between enriched and legacy parsers. A single struct deserializes both
old and new response shapes, with all fields except `index_name` and
`columns` optional. `index_type` acts as the sentinel: present → use
enriched fields directly; absent → call `/index/{name}/stats/`.

## Tests

Added `test_list_indices_enriched` covering:
- All enriched fields populated correctly when `index_type` is in the
list response
- Optional fields absent from the response deserialize as `None`
- Stats endpoint is **not** called (panics if hit), verifying the
fan-out is eliminated

Existing `test_list_indices` and `test_list_indices_nested_field_paths`
exercise the legacy path unchanged.

## Depends on

- #3497 (expand `IndexConfig`) — already merged
- Server-side enriched response support

Closes #3494

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-15 09:21:17 -07:00
2023-03-17 18:15:19 -07:00
2025-03-10 09:01:23 -07:00

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LanceDB is designed for fast, scalable, and production-ready vector search. It is built on top of the Lance columnar format. You can store, index, and search over petabytes of multimodal data and vectors with ease. LanceDB is a central location where developers can build, train and analyze their AI workloads.


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