ProjectionOpener

datafusion_datasource::projection

Struct ProjectionOpener 

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pub struct ProjectionOpener { /* private fields */ }
Expand description

A file opener that handles applying a projection on top of an inner opener.

This includes handling partition columns.

Any projection pushed down will be split up into:

  • Simple column indices / column selection
  • A remainder projection that this opener applies on top of it

This is meant to simplify projection pushdown for sources like CSV that can only handle “simple” column selection.

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impl ProjectionOpener

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pub fn try_new( projection: SplitProjection, inner: Arc<dyn FileOpener>, file_schema: &Schema, ) -> Result<Arc<dyn FileOpener>>

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impl FileOpener for ProjectionOpener

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fn open(&self, partitioned_file: PartitionedFile) -> Result<FileOpenFuture>

Asynchronously open the specified file and return a stream of RecordBatch

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