Method try_pushdown_projection

datafusion/datasource-parquet/src/source.rs:645–652

(
        &self,
        projection: &ProjectionExprs,
    )

    }

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

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