SchemaMapper

datafusion::datasource::schema_adapter

Trait SchemaMapper 

Source 
pub trait SchemaMapper:
    Debug
    + Send
    + Sync {
    // Required methods
    fn map_batch(
        &self,
        batch: RecordBatch,
    ) -> Result<RecordBatch, DataFusionError>;
    fn map_column_statistics(
        &self,
        file_col_statistics: &[ColumnStatistics],
    ) -> Result<Vec<ColumnStatistics>, DataFusionError>;
}
Expand description

Maps, columns from a specific file schema to the table schema.

See DefaultSchemaAdapterFactory for more details and examples.

Required Methods§

Source

fn map_batch(&self, batch: RecordBatch) -> Result<RecordBatch, DataFusionError>

Adapts a RecordBatch to match the table_schema

Source

fn map_column_statistics( &self, file_col_statistics: &[ColumnStatistics], ) -> Result<Vec<ColumnStatistics>, DataFusionError>

Adapts file-level column Statistics to match the table_schema

Implementors§