Class: Veritas::Optimizer::Algebra::Summarization::EmptySummarizePer

Inherits:
Veritas::Optimizer::Algebra::Summarization show all
Defined in:
lib/veritas/optimizer/algebra/summarization.rb

Overview

Optimize when the summarize_per is empty

Constant Summary

Constants inherited from Veritas::Optimizer

Noop, VERSION

Instance Attribute Summary

Attributes inherited from Veritas::Optimizer::Algebra::Summarization

#summarize_per, #summarizers

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 Veritas::Optimizer::Algebra::Summarization

#initialize

Methods inherited from Relation::Operation::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::Algebra::Summarization

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 summarize_per is empty

Returns:

  • (Boolean) 


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# File 'lib/veritas/optimizer/algebra/summarization.rb', line 131

def optimizable?
  summarize_per.kind_of?(Veritas::Relation::Empty)
end

#optimize ⇒ Relation::Empty

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.

Return an empty relation if there is nothing to summarize over

Returns:

  • (Relation::Empty) 


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# File 'lib/veritas/optimizer/algebra/summarization.rb', line 140

def optimize
  operation = self.operation
  Veritas::Relation::Empty.new(operation.header, operation)
end