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module Groonga
module ExpressionTree
class FunctionCall
attr_reader :procedure
attr_reader :arguments
def initialize(procedure, arguments)
@procedure = procedure
@arguments = arguments
end
def build(expression)
@procedure.build(expression)
@arguments.each do |argument|
argument.build(expression)
end
expression.append_operator(Operator::CALL, @arguments.size)
end
def estimate_size(table)
return table.size unless @procedure.name == "between"
column, min, min_border, max, max_border = @arguments
if column.is_a?(Groonga::ExpressionTree::IndexColumn)
index_column = column.object
else
index_info = column.column.find_index(Operator::CALL)
return table.size if index_info.nil?
index_column = index_info.index
end
while index_column.is_a?(Groonga::Accessor)
if index_column.have_next?
index_column = index_column.next
else
index_column = index_column.object
index_info = index_column.find_index(Operator::CALL)
return table.size if index_info.nil?
index_column = index_info.index
end
end
lexicon = index_column.lexicon
options = {
:min => min.value,
:max => max.value,
:flags => 0,
}
if min_border.value == "include"
options[:flags] |= TableCursorFlags::LT
else
options[:flags] |= TableCursorFlags::LE
end
if max_border.value == "include"
options[:flags] |= TableCursorFlags::GT
else
options[:flags] |= TableCursorFlags::GE
end
TableCursor.open(lexicon, options) do |cursor|
index_column.estimate_size(:lexicon_cursor => cursor)
end
end
end
end
end
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