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Joshua Shinavier edited this page Jun 10, 2026 · 11 revisions

Releases

This page indexes Hydra's published releases and package registries. All Hydra packages in a release share a single version number.

For release policy, see Release-policy; for the publish procedure, see docs/release-workflow.md. For release notes, see CHANGELOG.md.

This page follows the same broad separation used by Apache TinkerPop's download page: published package locations are listed separately from historical releases and release verification. Hydra is not yet an Apache project, so source-release signing and Apache mirror verification are future work under #441.

Published packages

Current package registries used by Hydra:

The package set has changed over time. Older releases were usually represented by the Hackage hydra package and, later, by Java artifacts. Hydra 0.15 introduced per-package Java and Python distributions. On Maven Central, hydra-java is available back to 0.2.0 and hydra-ext back to 0.7.0.

Release verification

Hydra release verification currently happens through the project release workflow. See docs/release-workflow.md for the maintainer procedure.

Apache-style source-release signatures, checksums, and mirror/archive instructions are future #441 work.

0.16

0.16.0 — 2026-06-09. GitHub tag. CHANGELOG.

Primitive-metadata reification (PrimitiveDefinition with host-independent specs for every standard-library primitive), self-hosting coder DSLs with all eight hosts passing the common test suite, finalized hydra.packaging, and a deep kernel-vocabulary cleanup (maybe→optional, order-preserving JSON).

Published package links:

0.15

0.15.0 — 2026-04-29. GitHub tag. CHANGELOG.

Structural cleanup release: the repository moved to the packages/ / heads/ / dist/ layout, Java and Python shifted to per-package published artifacts, and JSON kernel format v1 was formalized.

Published package links:

0.14

0.14.1 — 2026-03-30. GitHub tag. CHANGELOG.

Patch release regenerating all implementations after a group-eval primitive fix.

0.14.0 — 2026-03-29. GitHub tag. CHANGELOG.

Major release adding Scala, Clojure, Common Lisp, and Scheme as complete implementations, with Avro bidirectional coding and new demos.

Published package links:

0.13

0.13.0 — 2026-02-27. GitHub tag. CHANGELOG.

Major release completing Hydra-Python and Hydra-Java as self-hosting implementations and demonstrating mutual self-hosting across Haskell, Java, and Python.

Published package links:

0.12

0.12.0 — 2025-08-28. GitHub tag. CHANGELOG.

Consolidation release with significant Python progress, kernel cleanup, and bookkeeping closures for Java module ports.

Published package links:

0.11

0.11.0 — 2025-03-16. GitHub tag. CHANGELOG.

Type-inference rebase release aligning inference internals with Algorithm W.

Historical note:

0.10

0.10.0 — 2025-02-19. GitHub tag. CHANGELOG.

Added initial Hydra-Python completion, GraphSON coding, provisional Hydra-Go, and dot-separated namespaces.

Historical note:

0.9

0.9.0 — 2025-01-06. GitHub tag. CHANGELOG.

Bootstrapped Hydra-Python and the JSON Schema coder; added a fluent Java DSL for flows.

Historical note:

0.8

0.8.1 — 2024-09-24. GitHub tag. CHANGELOG.

Patch release generalizing property-graph merging.

0.8.0 — 2024-09-09. GitHub tag. CHANGELOG.

Added C# support, Graphviz DOT coding, term accessors, and a Java error-handling change for Spark.

Published package links:

0.7

0.7.0 — 2024-08-21. GitHub tag. CHANGELOG.

Major module-organization release establishing DNS-style namespaces in hydra-ext and promoting property-graph models into hydra.pg.

Published package links:

0.6

0.6.0 — 2024-08-19. GitHub tag. CHANGELOG.

Type-system improvement release with System F type abstraction/application, expanded language support, and revamped annotations.

Published package links:

0.5

0.5.3 — 2024-08-06. GitHub tag. CHANGELOG.

Patch release preserving map/set ordering during JSON serialization.

0.5.1 — 2024-08-01. GitHub tag. CHANGELOG.

Patch release with dependency updates and minor improvements after the 0.5.0 Hydra Core overhaul.

0.5.0 — 2024-07-26. GitHub tag. CHANGELOG.

Major Hydra Core overhaul replacing polymorphic core types with explicit type schemes and revamping Let term encoding.

Historical note:

0.4

0.4.0 — 2024-07-10. GitHub tag. CHANGELOG.

Added null checks to generated Java, the Gremlin model, and Protobuf annotation refinements.

Historical note:

0.3

0.3.0 — 2024-06-05. GitHub tag. CHANGELOG.

Added an OpenCypher parser, KQL model and serializer, Delta Parquet model, and early property-graph query support.

Historical note:

0.2

0.2.0 — 2024-01-10. GitHub tag. CHANGELOG.

Hydra-Java release with major Java tooling, Protobuf bidirectional coding, property-graph validation, JSON support, and early OpenCypher support.

Published package links:

0.1

0.1.1 — 2022-12-04. GitHub tag. CHANGELOG.

Patch release with README polish.

0.1.0 — 2022-12-04. GitHub tag. CHANGELOG.

First packaged Hydra release. Included the core language, graph/module models, type inference, adapters, coders, and early language support.

Published package links:

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