Sha256: c4918538377be7179cac3c89c0fd864e5bf9e06d62e8059e094f67f657eef9b2
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Contents
# encoding: utf-8 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, LeftOrderOperand, RightOrderOperand, MaterializedOperands, UnoptimizedOperands ) end # class Product end # module Algebra end # class Optimizer end # module Veritas
Version data entries
2 entries across 2 versions & 1 rubygems
Version | Path |
---|---|
veritas-optimizer-0.0.7 | lib/veritas/optimizer/algebra/product.rb |
veritas-optimizer-0.0.6 | lib/veritas/optimizer/algebra/product.rb |