Class: Veritas::Optimizer::Algebra::Union::EmptyLeft

Inherits:

Veritas::Optimizer::Algebra::Union

• Object
• Veritas::Optimizer
• Relation::Operation::Binary
• Veritas::Optimizer::Algebra::Union
• Veritas::Optimizer::Algebra::Union::EmptyLeft

Includes:

Relation::Operation::Binary::EmptyLeft

Defined in:

lib/veritas/optimizer/algebra/union.rb

Overview

Optimize when the left operand is empty

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 private

  A Union with an empty left operand is equivalent to the right.

Methods included from Relation::Operation::Binary::EmptyLeft

#optimizable?

Methods included from Function::Binary

#initialize

Methods inherited from Veritas::Optimizer

chain, #initialize, #optimizable?

Instance Method Details

#optimize ⇒ Relation

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 Union with an empty left operand is equivalent to the right

Returns:

• (Relation)

# File 'lib/veritas/optimizer/algebra/union.rb', line 34

def optimize
  right
end