lance-format/lance

Display warning if the index is not built for a vector column during query

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#804 opened on Apr 24, 2023

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Description

When user does a ANN query, show warnings if the index was not built for the column, for potentially slow query speed.

However, doing so blindly makes it really annoying for smaller datasets that really don't need an ANN index. One alternative could be that during the KNN (flat search) execution, if the runtime exceed a certain threshold to print the warning.

Contributor guide

Research direction
Add a runtime threshold check in the KNN (flat search) execution to measure query time. If the time exceeds a predefined limit and the vector column lacks an index, print a warning suggesting index creation.
Tech stack
rust
Domain
backenddatabase
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
55