Module datafusion::datasource::schema_adapter

SchemaAdapter and SchemaAdapterFactory to adapt file-level record batches to a table schema.

Adapter provides a method of translating the RecordBatches that come out of the physical format into how they should be used by DataFusion. For instance, a schema can be stored external to a parquet file that maps parquet logical types to arrow types.

Structs

• SchemaMapping
  The SchemaMapping struct holds a mapping from the file schema to the table schema and any necessary type conversions that need to be applied.

Traits

• SchemaAdapter
  Adapt file-level RecordBatches to a table schema, which may have a schema obtained from merging multiple file-level schemas.
• SchemaAdapterFactory
  Factory for creating SchemaAdapter
• SchemaMapper
  Creates a SchemaMapping that can be used to cast or map the columns from the file schema to the table schema.