Class: Veritas::Optimizer::Relation::Operation::Offset::OffsetOperand

Inherits:

Veritas::Optimizer::Relation::Operation::Offset

• Object
• Veritas::Optimizer
• Unary
• Veritas::Optimizer::Relation::Operation::Offset
• Veritas::Optimizer::Relation::Operation::Offset::OffsetOperand

Defined in:

lib/veritas/optimizer/relation/operation/offset.rb

Overview

Optimize when the operand is an Offset

Constant Summary

Constants inherited from Veritas::Optimizer

Noop, VERSION

Instance Attribute Summary

Attributes inherited from Unary

#header

Attributes included from Function::Unary

#operand

Attributes inherited from Veritas::Optimizer

#operation

Instance Method Summary

• #optimizable? ⇒ Boolean private

  Test if the operand is an Offset.

• #optimize ⇒ Boolean private

  Flatten Offset operations using the sum of the offsets.

Methods inherited from Unary

#initialize

Methods included from Function::Unary

#initialize

Methods inherited from Veritas::Optimizer

chain, #initialize

Constructor Details

This class inherits a constructor from Veritas::Optimizer::Relation::Operation::Unary

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 an Offset

Returns:

• (Boolean)

# File 'lib/veritas/optimizer/relation/operation/offset.rb', line 53

def optimizable?
  operand.kind_of?(operation.class)
end

#optimize ⇒ 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.

Flatten Offset operations using the sum of the offsets

Returns:

• (Boolean)

# File 'lib/veritas/optimizer/relation/operation/offset.rb', line 62

def optimize
  operand.operand.drop(sum_offset)
end