lance-format/lance

[DuckDB] Implement replacement scan function for Lance Scan in DuckDB

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#641 opened on Feb 25, 2023

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Description

Problem Statement

DuckDB has a concept of replacement scan when the URL of dataset matches to certain pattern, the URL itself can be used to indicate which scan function to call,

For example,

SELECT * FROM s3://foo/bar/zoo.lance
-- Replace
SELECT * FROM lance_scan("s3://foo/bar/zoo.lance")

Reference of the old (c++) implementation

https://github.com/eto-ai/lance/blob/78e5af7dec1a9602823797ba18eafc632ba727c3/integration/duckdb/src/lance/duckdb/lance-extension.cc#L65

Desired Behavior

Re-enable the scan replacement of lance scan in the rust-based duckdb extension.

Contributor guide

Research direction
Study the old C++ implementation of replacement scan at the provided reference and replicate it in the Rust based DuckDB extension using the DuckDB Rust API.
Tech stack
rustsql
Domain
databaseapi
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
RustDuckDB
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40