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SchemaMapping

datafusion_datasource::schema_adapter

Struct SchemaMapping 

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pub struct SchemaMapping { /* private fields */ }
👎Deprecated since 52.0.0:

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

Expand description

Deprecated: The SchemaMapping struct held a mapping from the file schema to the table schema.

This struct has been removed.

Use PhysicalExprAdapterFactory instead to customize scans via FileScanConfigBuilder, i.e. if you had implemented a custom SchemaAdapter and passed that into FileScanConfigBuilder / ParquetSource. Use BatchAdapter if you want to map a stream of RecordBatches between one schema and another, i.e. if you were calling SchemaMapper::map_batch manually.

See upgrading.md for more details.

Trait Implementations§

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impl SchemaMapper for SchemaMapping

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

👎Deprecated since 52.0.0:

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

Adapts a RecordBatch to match the table_schema.
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fn map_column_statistics( &self, _file_col_statistics: &[ColumnStatistics], ) -> Result<Vec<ColumnStatistics>>

👎Deprecated since 52.0.0:

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

Adapts file-level column Statistics to match the table_schema.
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impl Debug for SchemaMapping

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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