Function datafusion_physical_expr::equivalence::project_ordering_equivalence_properties

pub fn project_ordering_equivalence_properties(
    input_eq: OrderingEquivalenceProperties,
    columns_map: &HashMap<Column, Vec<Column>>,
    output_eq: &mut OrderingEquivalenceProperties
)

This function applies the given projection to the given ordering equivalence properties to compute the resulting (projected) ordering equivalence properties; e.g.

1. Adding an alias, which can introduce additional ordering equivalence properties, as in Projection(a, a as a1, a as a2) extends global ordering of a to a1 and a2.
2. Truncate the OrderingEquivalentClasses that are not in the output schema.