Class: Veritas::Optimizer::Algebra::Difference::EqualOperands

Inherits:

Veritas::Optimizer::Algebra::Difference

• Object
• Veritas::Optimizer
• Relation::Operation::Binary
• Veritas::Optimizer::Algebra::Difference
• Veritas::Optimizer::Algebra::Difference::EqualOperands

Includes:

Relation::Operation::Binary::EqualOperands

Defined in:

lib/veritas/optimizer/algebra/difference.rb

Overview

Optimize when operands are equal

Constant Summary

Constants inherited from Veritas::Optimizer

Noop, VERSION

Instance Attribute Summary

Attributes included from Function::Binary

#left, #right

Attributes inherited from Veritas::Optimizer

#operation

Instance Method Summary

• #optimize ⇒ Relation::Empty private

  A Difference with equal operands is empty.

Methods included from Relation::Operation::Binary::EqualOperands

#optimizable?

Methods included from Function::Binary

#initialize

Methods inherited from Veritas::Optimizer

chain, #initialize, #optimizable?

Instance Method Details

#optimize ⇒ Relation::Empty

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

A Difference with equal operands is empty

Returns:

• (Relation::Empty)

# File 'lib/veritas/optimizer/algebra/difference.rb', line 19

def optimize
  operation = self.operation
  Veritas::Relation::Empty.new(operation.header, operation)
end