Module mz_transform::attribute::cardinality

Definition and helper structs for the Cardinality attribute.

Structs

• Cardinality
  Compute the estimated cardinality of each subtree of a MirRelationExpr from the bottom up.
• HumanizedSymbolicExpression
  Wrapping struct for pretty printing of symbolic expressions
• WorstCaseFactorizer
  The simplest possible Factorizer that aims to generate worst-case, upper-bound cardinalities

Enums

• FactorizerVariable
  The variables used in symbolic expressions representing cardinality

Constants

• WORST_CASE_SELECTIVITY
  The default selectivity for predicates we know nothing about.

Traits

• Factorizer
  A Factorizer computes selectivity factors

Type Aliases

• SymExp
  SymbolicExpressions specialized to factorizer variables