ZekiLiu opened a new pull request, #941:
URL: https://github.com/apache/incubator-graphar/pull/941
### Reason for this PR
Part of the pure-Go GraphAr SDK (tracking issus #828), following the
bootstrap PR #937.
This is the foundational `types` package: the primitive value enums every
higher
layer (info, reader/writer) depends on. Kept separate from `DataType` (next
PR) so
each PR stays a single, reviewable module. The diff is a bit over the usual
size,
but about half is table-driven tests and the four enums are one cohesive,
dependency-free unit; splitting them further would fragment the value layer.
### What changes are included in this PR?
New package `go/graphar/types` with four on-disk value types plus their
string
parse/serialize and sentinel errors:
- `FileType` — csv / parquet / orc / json
- `Cardinality` — single / list / set
- `AdjListType` — unordered/ordered × by_source/by_dest, with helpers to
convert
to/from the legacy `(ordered, aligned_by)` form (`src`/`dst`)
Enum members and on-disk spellings match the C++ and Java SDKs (verified
member-by-member); Rust and Python are FFI/bindings over C++. No Arrow or
third-party dependency.
### Are these changes tested?
Yes. Table-driven unit tests cover round-trips, error paths, defensive
copying,
and the lenient/strict version-string cases.
### Are there any user-facing changes?
Yes — this adds the public `types` package. No breaking changes (new code
only).
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