Method try_pushdown_projection

datafusion/datasource-arrow/src/source.rs:380–390

(
        &self,
        projection: &ProjectionExprs,
    )

    }

    fn try_pushdown_projection(
        &self,
        projection: &ProjectionExprs,
    ) -> Result<Option<Arc<dyn FileSource>>> {
        let mut source = self.clone();
        source.projection = SplitProjection::new(
            self.table_schema().file_schema(),
            &source.projection.source.try_merge(projection)?,
        );
        Ok(Some(Arc::new(source)))
    }

    fn projection(&self) -> Option<&ProjectionExprs> {
        Some(&self.projection.source)