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module Groonga
module ExpressionTree
class LogicalOperation
attr_reader :operator
attr_reader :nodes
def initialize(operator, nodes)
@operator = operator
@nodes = nodes
end
def build(expression)
@nodes.each_with_index do |node, i|
node.build(expression)
expression.append_operator(@operator, 2) if i > 0
end
end
def estimate_size(table)
estimated_sizes = @nodes.collect do |node|
node.estimate_size(table)
end
case @operator
when Operator::AND
estimated_sizes.min
when Operator::OR
estimated_sizes.max
else
estimated_sizes.first
end
end
end
end
end
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