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require "scan_info_data"
module Groonga
class ScanInfoBuilder
def initialize(expression, operator, record_exist)
@data_list = []
@expression = expression
@operator = operator
@record_exist = record_exist
@variable = @expression[0]
@table = Context.instance[@variable.domain]
end
RELATION_OPERATORS = [
Operator::MATCH,
Operator::NEAR,
Operator::NEAR2,
Operator::SIMILAR,
Operator::PREFIX,
Operator::SUFFIX,
Operator::EQUAL,
Operator::NOT_EQUAL,
Operator::LESS,
Operator::GREATER,
Operator::LESS_EQUAL,
Operator::GREATER_EQUAL,
Operator::GEO_WITHINP5,
Operator::GEO_WITHINP6,
Operator::GEO_WITHINP8,
Operator::TERM_EXTRACT,
Operator::REGEXP,
Operator::FUZZY,
]
ARITHMETIC_OPERATORS = [
Operator::BITWISE_OR,
Operator::BITWISE_XOR,
Operator::BITWISE_AND,
Operator::BITWISE_NOT,
Operator::SHIFTL,
Operator::SHIFTR,
Operator::SHIFTRR,
Operator::PLUS,
Operator::MINUS,
Operator::STAR,
Operator::MOD,
]
LOGICAL_OPERATORS = [
Operator::AND,
Operator::OR,
Operator::AND_NOT,
Operator::ADJUST,
]
def build
return nil unless valid?
context = BuildContext.new(@expression)
codes = context.codes
while context.have_next?
code = context.code
code_op = context.code_op
i = context.i
context.next
case code_op
when *RELATION_OPERATORS
context.status = :start
data = context.data
data.op = code_op
data.end = i
data.weight = code.value.value if code.value
data.match_resolve_index
@data_list << data
context.data = nil
when *LOGICAL_OPERATORS
if context.status == :const
data = context.data
data.op = Operator::PUSH
data.end = data.start
@data_list << data
context.data = nil
end
put_logical_op(code_op, i)
# TODO: rescue and return nil
context.status = :start
when Operator::PUSH
context.data ||= ScanInfoData.new(i)
data = context.data
if code.value == @variable
context.status = :var
else
data.args << code.value
if context.status == :start
data.flags |= ScanInfo::Flags::PRE_CONST
end
context.status = :const
end
if code.modify > 0 and
LOGICAL_OPERATORS.include?(codes[i + code.modify].op)
data.op = Operator::PUSH
data.end = data.start
@data_list << data
context.data = nil
context.status = :start
end
when Operator::GET_VALUE
case context.status
when :start
context.data ||= ScanInfoData.new(i)
data = context.data
context.status = :column1
data.args << code.value
when :const, :var
context.status = :column1
data.args << code.value
when :column1
message = "invalid expression: can't use column as a value: "
message << "<#{code.value.name}>: <#{@expression.grn_inspect}>"
raise ErrorMessage, message
when :column2
# Do nothing
else
message = "internal expression parsing error: unknown status: "
message << "<#{context.status.inspect}>: "
message << "<#{@expression.grn_inspect}>"
raise ErrorMessage, message
end
when Operator::CALL
context.data ||= ScanInfoData.new(i)
data = context.data
if (code.flags & ExpressionCode::Flags::RELATIONAL_EXPRESSION) != 0 or
(not context.have_next?)
context.status = :start
data.op = code_op
data.end = i
data.call_relational_resolve_indexes
@data_list << data
context.data = nil
else
context.status = :column2
end
when Operator::GET_REF
context.data ||= ScanInfoData.new(i)
case context.status
when :start
data = context.data
context.status = :column1
data.args << code.value
end
when Operator::GET_MEMBER
data = context.data
index = data.args.pop
data.start_position = index.value
context.status = :column1
when Operator::NOT
success = build_not(context, code, i)
return nil unless success
end
end
if @operator == Operator::OR and !@record_exist
first_data = @data_list.first
if (first_data.flags & ScanInfo::Flags::PUSH) == 0 or
first_data.logical_op != @operator
raise ErrorMessage, "invalid expr"
else
first_data.flags &= ~ScanInfo::Flags::PUSH
first_data.logical_op = @operator
end
else
put_logical_op(@operator, context.n_codes)
end
optimize
end
private
def valid?
n_relation_expressions = 0
n_logical_expressions = 0
status = :start
codes = @expression.codes
codes.each_with_index do |code, i|
case code.op
when *RELATION_OPERATORS
if status == :start || status == :var
return false
end
status = :start
n_relation_expressions += 1
when *ARITHMETIC_OPERATORS
if status == :start || status == :var
return false
end
status = :start
return false if n_relation_expressions != (n_logical_expressions + 1)
when *LOGICAL_OPERATORS
case status
when :start
n_logical_expressions += 1
return false if n_logical_expressions >= n_relation_expressions
when :const
n_logical_expressions += 1
n_relation_expressions += 1
return false if n_logical_expressions >= n_relation_expressions
status = :start
else
return false
end
when Operator::PUSH
if code.modify > 0 and
LOGICAL_OPERATORS.include?(codes[i + code.modify].op)
n_relation_expressions += 1
status = :start
else
if code.value == @variable
status = :var
else
status = :const
end
end
when Operator::GET_VALUE
case status
when :start, :const, :var
status = :column1
when :column1
status = :column2
when :column2
# Do nothing
else
return false
end
when Operator::CALL
if (code.flags & ExpressionCode::Flags::RELATIONAL_EXPRESSION) != 0 or
code == codes.last
status = :start
n_relation_expressions += 1
else
status = :column2
end
when Operator::GET_REF
case status
when :start
status = :column1
else
return false
end
when Operator::GET_MEMBER
case status
when :const
return false unless codes[i - 1].value.value.is_a?(Integer)
status = :column1
else
return false
end
when Operator::NOT
# Do nothing
else
return false
end
end
return false if status != :start
return false if n_relation_expressions != (n_logical_expressions + 1)
true
end
def put_logical_op(operator, start)
n_parens = 1
n_dif_ops = 0
r = 0
j = @data_list.size
while j > 0
j -= 1
data = @data_list[j]
if (data.flags & ScanInfo::Flags::POP) != 0
n_dif_ops += 1
n_parens += 1
else
if (data.flags & ScanInfo::Flags::PUSH) != 0
n_parens -= 1
if n_parens == 0
if r == 0
if n_dif_ops > 0
if j > 0 and operator != Operator::AND_NOT
n_parens = 1
n_dif_ops = 0
r = j
else
new_data = ScanInfoData.new(start)
new_data.flags = ScanInfo::Flags::POP
new_data.logical_op = operator
@data_list << new_data
break
end
else
data.flags &= ~ScanInfo::Flags::PUSH
data.logical_op = operator
break
end
else
if n_dif_ops > 0
new_data = ScanInfoData.new(start)
new_data.flags = ScanInfo::Flags::POP
new_data.logical_op = operator
@data_list << new_data
else
data.flags &= ~ScanInfo::Flags::PUSH
data.logical_op = operator
@data_list =
@data_list[0...j] +
@data_list[r..-1] +
@data_list[j...r]
end
break
end
end
else
if operator == Operator::AND_NOT or operator != data.logical_op
n_dif_ops += 1
end
end
end
if j < 0
raise ErrorMessage, "unmatched nesting level"
end
end
end
def build_not(context, code, i)
last_data = @data_list.last
return false if last_data.nil?
case last_data.op
when Operator::LESS
last_data.op = Operator::GREATER_EQUAL
last_data.end += 1
when Operator::LESS_EQUAL
last_data.op = Operator::GREATER
last_data.end += 1
when Operator::GREATER
last_data.op = Operator::LESS_EQUAL
last_data.end += 1
when Operator::GREATER_EQUAL
last_data.op = Operator::LESS
last_data.end += 1
when Operator::NOT_EQUAL
last_data.op = Operator::EQUAL
last_data.end += 1
else
if @data_list.size == 1
if last_data.search_indexes.empty?
if last_data.op == Operator::EQUAL
last_data.op = Operator::NOT_EQUAL
last_data.end += 1
else
return false
end
else
last_data.logical_op = Operator::AND_NOT
last_data.flags &= ~ScanInfo::Flags::PUSH
@data_list.unshift(create_all_match_data)
end
else
next_code = context.code
return false if next_code.nil?
case next_code.op
when Operator::AND
context.code_op = Operator::AND_NOT
when Operator::AND_NOT
context.code_op = Operator::AND
when Operator::OR
@data_list[-1, 0] = create_all_match_data
put_logical_op(Operator::AND_NOT, i)
else
return false
end
end
end
true
end
def optimize
optimized_data_list = []
i = 0
n = @data_list.size
while i < n
data = @data_list[i]
next_data = @data_list[i + 1]
i += 1
if next_data.nil?
optimized_data_list << data
next
end
if range_operations?(data, next_data)
between_data = create_between_data(data, next_data)
optimized_data_list << between_data
i += 1
next
end
optimized_data_list << data
end
optimize_by_estimated_size(optimized_data_list)
end
def optimize_by_estimated_size(data_list)
return data_list unless Groonga::ORDER_BY_ESTIMATED_SIZE
start_index = nil
data_list.size.times do |i|
data = data_list[i]
if data.logical_op != Operator::AND
if start_index.nil?
start_index = i
else
sort_by_estimated_size!(data_list, start_index...i)
start_index = nil
end
end
end
unless start_index.nil?
sort_by_estimated_size!(data_list, start_index...data_list.size)
end
data_list
end
def sort_by_estimated_size!(data_list, range)
target_data_list = data_list[range]
return if target_data_list.size < 2
start_logical_op = target_data_list.first.logical_op
sorted_data_list = target_data_list.sort_by do |data|
estimator = ScanInfoDataSizeEstimator.new(data, @table)
estimator.estimate
end
sorted_data_list.each do |sorted_data|
sorted_data.logical_op = Operator::AND
end
sorted_data_list.first.logical_op = start_logical_op
data_list[range] = sorted_data_list
end
def range_operations?(data, next_data)
return false unless next_data.logical_op == Operator::AND
op, next_op = data.op, next_data.op
return false if !(lower_condition?(op) or lower_condition?(next_op))
return false if !(upper_condition?(op) or upper_condition?(next_op))
return false if data.args[0] != next_data.args[0]
data_search_indexes = data.search_indexes
return false if data_search_indexes.empty?
data_search_indexes == next_data.search_indexes
end
def lower_condition?(operator)
case operator
when Operator::GREATER, Operator::GREATER_EQUAL
true
else
false
end
end
def upper_condition?(operator)
case operator
when Operator::LESS, Operator::LESS_EQUAL
true
else
false
end
end
def create_all_match_data
data = ScanInfoData.new(0)
data.end = 0
data.flags = ScanInfo::Flags::PUSH
data.op = Operator::CALL
data.logical_op = Operator::OR
data.args = [Context.instance["all_records"]]
data.search_indexes = []
data
end
def create_between_data(data, next_data)
between_data = ScanInfoData.new(data.start)
between_data.end = next_data.end + 1
between_data.flags = data.flags
between_data.op = Operator::CALL
between_data.logical_op = data.logical_op
between_data.args = create_between_data_args(data, next_data)
between_data.search_indexes = data.search_indexes
between_data
end
def create_between_data_args(data, next_data)
between = Context.instance["between"]
@expression.take_object(between)
column = data.args[0]
op, next_op = data.op, next_data.op
if lower_condition?(op)
min = data.args[1]
min_operator = op
max = next_data.args[1]
max_operator = next_op
else
min = next_data.args[1]
min_operator = next_op
max = data.args[1]
max_operator = op
end
if min_operator == Operator::GREATER
min_border = "exclude"
else
min_border = "include"
end
if max_operator == Operator::LESS
max_border = "exclude"
else
max_border = "include"
end
[
between,
column,
min,
@expression.allocate_constant(min_border),
max,
@expression.allocate_constant(max_border),
]
end
class BuildContext
attr_accessor :status
attr_reader :codes
attr_reader :n_codes
attr_reader :i
attr_writer :code_op
attr_accessor :data
def initialize(expression)
@expression = expression
@status = :start
@current_data = nil
@codes = @expression.codes
@n_codes = @codes.size
@i = 0
@code_op = nil
@data = nil
end
def have_next?
@i < @n_codes
end
def next
@i += 1
@code_op = nil
end
def code
@codes[@i]
end
def code_op
@code_op || code.op
end
end
end
end
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