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SchemaResolver

laminar_connectors::schema::resolver

Struct SchemaResolver 

Source 
pub struct SchemaResolver;
Expand description

Stateless schema resolver.

Implements the five-level priority chain and wildcard merge logic.

Implementations§

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impl SchemaResolver

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pub async fn resolve( declared: &DeclaredSchema, connector: &dyn SourceConnector, inference_config: &InferenceConfig, ) -> SchemaResult<ResolvedSchema>

Resolves the schema for a source connector.

Applies the five-level priority chain:

  1. Full DDL without wildcard → Declared
  2. Schema registry → Registry
  3. Schema provider → SourceProvided
  4. Sample inference → Inferred
  5. Error

When the DDL contains a wildcard, the resolver merges declared columns with the resolved schema via merge_with_declared.

§Errors

Returns SchemaError if no resolution strategy succeeds.

Source

pub fn merge_with_declared( declared: &DeclaredSchema, resolved: &SchemaRef, kind: ResolutionKind, ) -> SchemaResult<ResolvedSchema>

Merges user-declared columns with a resolved schema.

User-declared columns come first and take precedence. Resolved columns that don’t conflict are appended, optionally with a wildcard prefix.

§Errors

Currently infallible, but returns SchemaResult for future extensibility (e.g., type coercion failures).

§Panics

Panics if a declared column name exists in declared_names but cannot be found in declared.columns (this is logically impossible).

Source

pub fn validate_wildcard( declared: &DeclaredSchema, connector: &dyn SourceConnector, ) -> SchemaResult<()>

Validates that a wildcard declaration is consistent and usable.

Checks:

  • The connector supports at least one schema resolution path (provider, registry, or inference).
  • If a prefix is set, no prefixed column name collides with a declared column name.
§Errors

Returns SchemaError::WildcardWithoutInference if no resolution path is available, or SchemaError::WildcardPrefixCollision if a prefixed name collides with a declared column.

Source

pub fn check_prefix_collision( declared: &DeclaredSchema, resolved: &SchemaRef, ) -> SchemaResult<()>

Checks that wildcard-prefixed column names don’t collide with declared columns.

Call this after schema resolution when the resolved field names are known.

§Errors

Returns SchemaError::WildcardPrefixCollision on collision.

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pub fn declared_to_arrow(declared: &DeclaredSchema) -> SchemaResult<SchemaRef>

Converts a DeclaredSchema into an Arrow [SchemaRef].

§Errors

Returns SchemaError::InferenceFailed if the declared schema has no columns.

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