Module mz_sql::query_model::rewrite::rule::simplify_outer_joins

Implements outerjoin simplification.

For each outer join box, check to see if any ancestor rejects nulls on its output.

Structs

SimplifyOuterJoins 🔒

Functions

map_nulls_to_inputs 🔒

Map (rejected nulls from any ancestor of box, expressed as column references from an input of the parent of box) -> (column references from an input of box)

unique_ancestor_chain 🔒

Find the unique ancestor chain from the top box of model to target box. The ancestor chain does not contain target.