Function transform::join_implementation::delta_queries::plan

pub fn plan(
    join: &MirRelationExpr, 
    input_mapper: &JoinInputMapper, 
    available: &[Vec<Vec<MirScalarExpr>>], 
    unique_keys: &[Vec<Vec<usize>>]
) -> Option<MirRelationExpr>

Creates a delta query plan, and any predicates that need to be lifted.

The method returns None if it fails to find a sufficiently pleasing plan.