Module datafusion_physical_expr::equivalence

Structs

• EquivalenceProperties
  Equivalence Properties is a vec of EquivalentClass.
• EquivalentClass
  EquivalentClass is a set of Columns or OrderedColumns that are known to have the same value in all tuples in a relation. EquivalentClass<Column> is generated by equality predicates, typically equijoin conditions and equality conditions in filters. EquivalentClass<OrderedColumn> is generated by the ROW_NUMBER window function.
• OrderedColumn
  This object represents a Column with a definite ordering.

Functions

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

Type Definitions

• OrderingEquivalenceProperties
  OrderingEquivalenceProperties keeps track of columns that describe the global ordering of the schema. These columns are not necessarily same; e.g.
• OrderingEquivalentClass