lance-format/lance

[Duckdb] Zero copy Arrow Array/RecordBatch to duckdb Vector/DataChunk conversion

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#348 opened on Dec 4, 2022

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Description

Problem Statement

#347 converts arrow array / RecordBatch reading from the LanceDataset to duckdb corresponding data structures via heavy data copy.

We need to implement zero-copy data transfer between arrow and duckdb to make the extension production ready.

  • Primitive Arrays to duckdb::Vector
  • ::arrow::StructArray
  • ::arrow::ListArray
  • ::arrow::DictionaryArray

Contributor guide

Research direction
Study the Arrow C Data Interface and DuckDB's Arrow integration. Implement zero copy by safely managing memory ownership and avoiding serialization. Start with primitive arrays.
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.
5
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
RustApache ArrowDuckDB internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30