Module schema_binding 

Versioned, immutable connector schema contracts stored with catalog definitions. Durable connector contracts. Native schemas remain separate from Arrow read/input schemas.

Structs

NativeSchema

One immutable native schema, including the semantics Arrow cannot express.

NativeSchemaArtifact

A transitive native definition and its scoped identity.

SchemaBinding

Immutable connector binding for one catalog generation.

SchemaFieldMapping

Declarative mapping compiled once by the connector when it activates.

Enums

SchemaBindingError

Structural or directional incompatibility in a resolved schema contract.

SchemaDirection

Direction in which a connector applies its schema contract.

SchemaOrigin

Authority that established the immutable logical schema.

Constants

MAX_SCHEMA_BINDING_BYTES

Maximum canonical size of one connector contract, including native references.

MAX_SCHEMA_FIELDS

Maximum number of logical or external fields in one binding.

MAX_SCHEMA_REFERENCES

Maximum transitive native schema artifacts in one binding.

SCHEMA_BINDING_VERSION

Current schema contract and declarative mapping representation.

Functions

same_logical_type

Compare logical types while retaining nested names, order and nullability. Native field metadata (including stable field IDs) remains in the external contract; its presence alone does not change a user’s explicitly declared logical type.