Module exporter 

Parquet exporter — turns a Workspace into resources.parquet (+ workspace.manifest.json) on disk per 20-parquet-exporter.md.

Phase 3 closes M0 by shipping the single-table flat schema pinned in 10-data-model.md § 3 (24 columns, all non-null with "" / empty-list as the “missing” sentinel). Future phases extend the output with dependencies.parquet, components.parquet, modules.parquet, etc. — same writer pattern, separate file, same atomic-rename guarantee.

Trust boundary

The exporter consumes only IR — Workspace values are already trusted (they crossed validation at discovery / loader / evaluator land). The one trust boundary the exporter polices is the output path: it refuses to overwrite existing files unless --overwrite is set, and writes atomically via <file>.partial → rename (per [99-key-decisions.md] D10).

Modules

json

Canonical-JSON renderer for the Parquet attributes_json column.

Structs

ExportOptions

Options for Exporter::export.

ExportReport

Report returned by Exporter::export.

ExportedFile

A single file the exporter produced.

Manifest

Top-level manifest structure.

ManifestFile

Per-file entry in the manifest.

ParquetExporter

Default Exporter backed by arrow-rs + parquet-rs.

Enums

CompressionOpt

Supported parquet compression codecs. Phase 3 ships the spec’s recommended default — zstd-3. The variant set is #[non_exhaustive] so future codecs can land without a breaking API change.

ExportError

Errors the exporter can raise.

SecondaryTable

Which Parquet table to emit alongside resources.parquet. Phase 8 landed dependencies / components / modules per spec 91 § 11.

Constants

PARSER_VERSION

Parser version embedded in every emitted row.

SCHEMA_MAJOR

Parquet schema major version. Bumps require a deprecation cycle.

SCHEMA_MINOR

Parquet schema minor version. Bumps are additive.

Traits

Exporter

Trait for workspace exporters. Phase 3 ships ParquetExporter; tests may swap in a stub that records calls without touching disk.

Functions

components_field_names

Column names in declaration order.

components_schema

Build the canonical components.parquet schema (spec 15 § 5).

dependencies_field_names

Column names in declaration order.

dependencies_schema

Build the canonical dependencies.parquet schema (spec 10 § 5.1).

modules_field_names

Column names in declaration order.

modules_schema

Build the canonical modules.parquet schema (spec 10 § 5.3).

resources_schema

Build the canonical resources.parquet schema.

schema_field_names

Ordered list of column names for the resources schema.

write_manifest

Write the manifest atomically (.partial → rename). Returns the byte size on disk after the rename.