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feat: add Scanner::projection_from_schema #5134

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feat: add Scanner::projection_from_schema #5134

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19 changes: 19 additions & 0 deletions rust/lance/src/dataset/scanner.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -713,6 +713,25 @@ impl Scanner {
Ok(self)
}

/// Set the projection from a schema.
///
/// This projection will have no complex expressions, the schema must be a subset of the dataset schema.
///
/// With this approach it is possible to refer to portions of nested fields.
///
/// See [`ProjectionPlan::from_schema`] for more information.
pub fn project_from_schema(&mut self, projection: &Schema) -> Result<&mut Self> {
self.explicit_projection = true;
self.projection_plan = ProjectionPlan::from_schema(self.dataset.clone(), projection)?;
if self.legacy_with_row_id {
self.projection_plan.include_row_id();
}
if self.legacy_with_row_addr {
self.projection_plan.include_row_addr();
}
Ok(self)
}

/// Should the filter run before the vector index is applied
///
/// If true then the filter will be applied before the vector index. This
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