GH-184: Export Arrow arrays through the C Data Interface#605
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Add ArrowSchema and ArrowArray ABI structs plus C Data import for null and primitive arrays. Root struct arrays are exposed as Tables.jl column tables with DataAPI metadata. Add validation for pointer layout, child counts, buffers, offset arithmetic, metadata bounds, dictionary pointer consistency, release idempotency, and reads after release. Keep aligned imported buffers rooted behind a shared owner, and mirror arrow-rs by copying misaligned fixed width buffers into aligned storage before typed access. The copy and collect methods materialize Julia owned arrays. Adjust dictionary encoding offsets for non 1-based reference pools so categorical pools with missing values keep correct dictionary indices. Co-authored-by: Robert Buessow <robert.buessow@relational.ai> Co-authored-by: Olle Martensson <olle.martensson@gmail.com> Generated-by: OpenAI Codex
Add import support for boolean, string, binary, list, fixed size, temporal, timestamp, duration, interval, and decimal C Data formats. Extend malformed input, offset, null count, release, copy, collect, metadata, and GC rooting coverage for the broader importer. Co-authored-by: Robert Buessow <robert.buessow@relational.ai> Co-authored-by: Olle Martensson <olle.martensson@gmail.com> Generated-by: OpenAI Codex
Add array and table export entry points with independent schema and array owners. Cover primitive and struct round trips, release order, moved child ownership, GC, metadata, malformed layout, unsupported export cases, and exported buffer layout checks for nested, string, and fixed size arrays. Co-authored-by: Robert Buessow <robert.buessow@relational.ai> Co-authored-by: Olle Martensson <olle.martensson@gmail.com> Generated-by: OpenAI Codex
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Refs #184
Depends on #603 and #604. Do not merge before both PRs land.
Incremental review diff: samtalki/arrow-julia@agent/cdata-import-breadth-v2...agent/cdata-export
This adds C Data export support on top of the broader importer:
Verification:
AI assistance: Generated with OpenAI Codex and reviewed for licensing and unsafe code concerns.
Incremental size note: relative to predecessor #604, this PR is 3 files changed, +1118/-2 diff lines, net +1116. GitHub may show the larger unmerged stack diff until #603 and #604 land.