Update to Substrait v0.101.0

[substrait-project-bot]

Release Notes

0.101.0 (2026-08-16)

⚠ BREAKING CHANGES

• extensions: extensions/extension_types.yaml and
  extensions/type_variations.yaml are no longer part of the extension
  catalog. They move to site/examples/extensions/, and their URNs change
  from extension:io.substrait:extension_types and
  extension:io.substrait:type_variations to
  extension:org.example:extension_types and
  extension:org.example:type_variations.

Consumers that resolve extension:io.substrait:extension_types — the
point/line user-defined types, which substrait-java and substrait-go
both register today — will no longer find it in the catalog, and should
either define those types locally or load the example explicitly under
its new URN.

The remaining example files keep their location but also move to the
extension:org.example: owner, including
lambda_function_example.yaml, which previously duplicated the official
extension:io.substrait:functions_list URN.

Nothing in the extension:org.example: namespace carries a
compatibility guarantee: those files exist to illustrate the extension
schema and to serve as parser fixtures, and may change without a
deprecation cycle.

• protos: Expression.FieldReference.OuterReference.steps_out
  is deprecated in favor of rel_reference, which names the binding
  relation via its plan-wide unique RelCommon.rel_anchor and therefore
  resolves unambiguously in DAG-shaped plans with shared relations
  (ReferenceRel), where counting subquery boundaries upward does not.
  Consumers should add rel_reference support before producers switch to
  it. Note that both fields are members of the same outer_reference_type
  oneof, so a plan cannot carry both forms at once: the migration is
  consumer-first rather than dual-write. Nothing is removed by this
  change: the deprecation is metadata only, consumers are not required to
  understand or validate it, and no existing plan changes meaning.
  steps_out remains fully functional and is scheduled for removal in a
  later release.

Features

• protos: deprecate OuterReference.steps_out in favor of rel_reference (#1132) (25940fb)

Bug Fixes

• add missing RelCommon field to UpdateRel (#1168) (cdf0102)

Code Refactoring

• extensions: move example YAML files out of the extensions folder (#1136) (c9f697e)

See https://github.com/substrait-io/substrait/releases/tag/v0.101.0