Class: Veritas::Optimizer::Relation::Operation::Unary

Inherits:

Veritas::Optimizer

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

Includes:

Function::Unary

Defined in:

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

Overview

Abstract base class representing Unary relation optimizations

Direct Known Subclasses

Algebra::Extension, Algebra::Projection, Algebra::Rename, Algebra::Restriction, Algebra::Summarization, Limit, Offset, Order, EmptyOperand, MaterializedOperand, UnchangedHeader

Defined Under Namespace

Modules: OrderOperand Classes: EmptyOperand, MaterializedOperand, UnchangedHeader

Constant Summary

Constants inherited from Veritas::Optimizer

Noop, VERSION

Instance Attribute Summary

• #header ⇒ Header readonly private

  The operation header.

Attributes included from Function::Unary

#operand

Attributes inherited from Veritas::Optimizer

#operation

Instance Method Summary

• #initialize ⇒ undefined constructor private

  Initialize a Unary optimizer.

Methods inherited from Veritas::Optimizer

chain, #optimizable?, #optimize

Constructor Details

#initialize ⇒ 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 a Unary optimizer

# File 'lib/veritas/optimizer/relation/operation/unary.rb', line 24

def initialize(*)
  super
  @header = operation.header
end

Instance Attribute Details

#header ⇒ Header (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 operation header

Returns:

• (Header)

# File 'lib/veritas/optimizer/relation/operation/unary.rb', line 17

def header
  @header
end