lance-format/lance

Remove duplicate datafusion code

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#5,671 opened on Jan 9, 2026

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good first issue

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Description

OneShotPartitionStream is defined in two places

  • rust/lance-datafusion/src/exec.rs
  • rust/lance/src/datafusion/dataframe.rs

In addition to this struct, there is a SessionContextExt defined in each of these. From a dependency graph it looks like lance-datafusion is the place we should have a single definition of these and then remove references to the other. The one issue I see is that the SessionContextExt in lance is more complete than the one in lance-datafusion.

Contributor guide

Research direction
Identify the differences between the two SessionContextExt implementations and merge them into lance datafusion, then remove the duplicate from lance.
Tech stack
rust
Domain
backend
Issue type
Refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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
RustGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75