Class: Veritas::Optimizer::Algebra::Rename

Inherits:

Relation::Operation::Unary

• Object
• Veritas::Optimizer
• Relation::Operation::Unary
• Veritas::Optimizer::Algebra::Rename

Defined in:

lib/veritas/optimizer/algebra/rename.rb

Overview

Abstract base class representing Rename optimizations

Direct Known Subclasses

EmptyOperand, LimitOperand, OffsetOperand, OrderOperand, ProjectionOperand, RenameOperand, RestrictionOperand, ReverseOperand, SetOperand, UnoptimizedOperand

Defined Under Namespace

Classes: EmptyOperand, LimitOperand, OffsetOperand, OrderOperand, ProjectionOperand, RenameOperand, RenameOperandAndEmptyAliases, RestrictionOperand, ReverseOperand, SetOperand, UnoptimizedOperand

Constant Summary

Constants inherited from Veritas::Optimizer

Noop, VERSION

Instance Attribute Summary

• #aliases ⇒ Rename::Aliases readonly private

  The optimized aliases.

Attributes inherited from Relation::Operation::Unary

#header

Attributes included from Function::Unary

#operand

Attributes inherited from Veritas::Optimizer

#operation

Instance Method Summary

• #initialize(operation) ⇒ undefined constructor private

  Initialize an Rename optimizer.

Methods inherited from Veritas::Optimizer

chain, #optimizable?, #optimize

Constructor Details

#initialize(operation) ⇒ undefined

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.

Initialize an Rename optimizer

Parameters:

• operation (Relation)

# File 'lib/veritas/optimizer/algebra/rename.rb', line 24

def initialize(operation)
  super
  @aliases = operation.aliases
end

Instance Attribute Details

#aliases ⇒ Rename::Aliases (readonly)

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.

The optimized aliases

Returns:

• (Rename::Aliases)

# File 'lib/veritas/optimizer/algebra/rename.rb', line 15

def aliases
  @aliases
end