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Contents
module Veritas class Optimizer module Algebra # Abstract base class representing Product optimizations class Product < Relation::Operation::Combination # Optimize when left operand is a TABLE DEE class TableDeeLeft < self # Test if the left operand is a TABLE DEE # # @return [Boolean] # # @api private def optimizable? left = self.left left.header.empty? && !left.kind_of?(Veritas::Relation::Empty) end # A Product with a left TABLE DEE is equivalent to the right operand # # @return [Relation] # # @api private def optimize right end end # class TableDeeLeft # Optimize when right operand is a TABLE DEE class TableDeeRight < self # Test if the right operand is a TABLE DEE # # @return [Boolean] # # @api private def optimizable? right = self.right right.header.empty? && !right.kind_of?(Veritas::Relation::Empty) end # A Product with a right TABLE DEE is equivalent to the left operand # # @return [Relation] # # @api private def optimize left end end # class TableDeeRight Veritas::Algebra::Product.optimizer = chain( TableDeeLeft, TableDeeRight, EmptyLeft, EmptyRight, MaterializedOperand, UnoptimizedOperand ) end # class Product end # module Algebra end # class Optimizer end # module Veritas
Version data entries
1 entries across 1 versions & 1 rubygems
Version | Path |
---|---|
veritas-0.0.2 | lib/veritas/optimizer/algebra/product.rb |