Module properties 

Re-exports

pub use joins::*;

pub use union::*;

Modules

dependency 🔒

joins 🔒

union 🔒

Structs

EquivalenceProperties

EquivalenceProperties stores information about the output of a plan node that can be used to optimize the plan. Currently, it keeps track of:

OrderingEquivalenceCache 🔒

This object serves as a cache for storing equivalent sort expressions in normal form, and a map associating leading sort expressions with full lexicographical orderings. With this information, DataFusion can efficiently determine whether a given ordering is satisfied by the existing orderings, and discover new orderings based on the existing equivalence properties.

Functions

expr_refers 🔒

This function examines whether a referring expression directly refers to a given referred expression or if any of its children in the expression tree refer to the specified expression.

get_expr_properties 🔒

This function examines the given expression and its properties to determine the ordering properties of the expression. The range knowledge is not utilized yet in the scope of this function.

update_properties 🔒

Calculates the properties of a given ExprPropertiesNode.