SchemaAdapter

datafusion_datasource::schema_adapter

Trait SchemaAdapter 

Source 
pub trait SchemaAdapter: Send + Sync {
    // Required methods
    fn map_column_index(
        &self,
        index: usize,
        file_schema: &Schema,
    ) -> Option<usize>;
    fn map_schema(
        &self,
        file_schema: &Schema,
    ) -> Result<(Arc<dyn SchemaMapper>, Vec<usize>)>;
}
👎Deprecated since 52.0.0: SchemaAdapter has been removed. Use PhysicalExprAdapterFactory instead. See upgrading.md for more details.
Expand description

Deprecated: Creates SchemaMappers to map file-level RecordBatches to a table schema.

This trait has been removed. Use PhysicalExprAdapterFactory instead. See upgrading.md for more details.

Required Methods§

Source

fn map_column_index(&self, index: usize, file_schema: &Schema) -> Option<usize>

👎Deprecated since 52.0.0: SchemaAdapter has been removed. Use PhysicalExprAdapterFactory instead. See upgrading.md for more details.

Map a column index in the table schema to a column index in a particular file schema.

Source

fn map_schema( &self, file_schema: &Schema, ) -> Result<(Arc<dyn SchemaMapper>, Vec<usize>)>

👎Deprecated since 52.0.0: SchemaAdapter has been removed. Use PhysicalExprAdapterFactory instead. See upgrading.md for more details.

Creates a mapping for casting columns from the file schema to the table schema.

Implementors§