Class: Veritas::Optimizer::Algebra::Restriction::JoinOperand

Inherits:
CombinationOperand show all
Defined in:
lib/veritas/optimizer/algebra/restriction.rb

Overview

Optimize when the operand is a Join

Constant Summary

Constants inherited from Veritas::Optimizer

Noop, VERSION

Instance Attribute Summary

Attributes inherited from Veritas::Optimizer::Algebra::Restriction

#predicate

Attributes inherited from Relation::Operation::Unary

#header

Attributes included from Function::Unary

#operand

Attributes inherited from Veritas::Optimizer

#operation

Instance Method Summary collapse

Methods inherited from CombinationOperand

#optimize

Methods inherited from Veritas::Optimizer::Algebra::Restriction

#initialize

Methods inherited from Relation::Operation::Unary

#initialize

Methods included from Function::Unary

#initialize

Methods inherited from Veritas::Optimizer

chain, #initialize, #optimize

Constructor Details

This class inherits a constructor from Veritas::Optimizer::Algebra::Restriction

Instance Method Details

#optimizable? ⇒ Boolean

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.

Test if the operand is a Join and the restriction is commutative

Returns:

  • (Boolean) 


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# File 'lib/veritas/optimizer/algebra/restriction.rb', line 244

def optimizable?
  operand.kind_of?(Veritas::Algebra::Join) && super
end