Class: Droonga::Plugins::Search::DistributedSearchPlanner::QueryTransformer
- Inherits:
-
Object
- Object
- Droonga::Plugins::Search::DistributedSearchPlanner::QueryTransformer
- Defined in:
- lib/droonga/plugins/search/distributed_search_planner.rb
Constant Summary collapse
- ASCENDING_OPERATOR =
"<"
- DESCENDING_OPERATOR =
">"
Instance Attribute Summary collapse
-
#mappers ⇒ Object
readonly
Returns the value of attribute mappers.
-
#reducers ⇒ Object
readonly
Returns the value of attribute reducers.
Instance Method Summary collapse
- #array_style_attributes ⇒ Object
- #build_attributes_mapper_and_reducer! ⇒ Object
- #build_count_mapper_and_reducer! ⇒ Object
- #build_elapsed_time_mapper_and_reducer! ⇒ Object
- #build_records_mapper_and_reducer! ⇒ Object
- #build_records_reducer ⇒ Object
- #calculate_offset_and_limit! ⇒ Object
- #calculate_output_offset! ⇒ Object
- #calculate_sort_offset! ⇒ Object
- #final_limit ⇒ Object
- #final_offset ⇒ Object
- #have_records? ⇒ Boolean
-
#initialize(dataset, query) ⇒ QueryTransformer
constructor
A new instance of QueryTransformer.
- #output_attribute_names ⇒ Object
- #output_limit ⇒ Object
- #output_offset ⇒ Object
- #rich_sort? ⇒ Boolean
- #sort_attribute_names ⇒ Object
- #sort_limit ⇒ Object
- #sort_offset ⇒ Object
- #source_column_names ⇒ Object
- #transform! ⇒ Object
- #unifiable? ⇒ Boolean
- #update_output_attributes! ⇒ Object
Constructor Details
#initialize(dataset, query) ⇒ QueryTransformer
Returns a new instance of QueryTransformer.
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 105 def initialize(dataset, query) @dataset = dataset @query = query @output = @query["output"] @reducers = {} @mappers = {} @output_records = true transform! end |
Instance Attribute Details
#mappers ⇒ Object (readonly)
Returns the value of attribute mappers.
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 103 def mappers @mappers end |
#reducers ⇒ Object (readonly)
Returns the value of attribute reducers.
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 103 def reducers @reducers end |
Instance Method Details
#array_style_attributes ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 340 def array_style_attributes attributes = @output["attributes"] || [] if attributes.is_a?(Hash) attributes.keys.collect do |key| attribute = attributes[key] case attribute when String { "label" => key, "source" => attribute, } when Hash attribute["label"] = key attribute end end else attributes end end |
#build_attributes_mapper_and_reducer! ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 281 def build_attributes_mapper_and_reducer! return unless @output["elements"].include?("attributes") @reducers["attributes"] = { "type" => "or", } @mappers["attributes"] = { "names" => output_attribute_names, } end |
#build_count_mapper_and_reducer! ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 247 def build_count_mapper_and_reducer! return unless @output["elements"].include?("count") @reducers["count"] = { "type" => "sum", } if unifiable? unless @dataset.single_slice? if @query["sortBy"].is_a?(Hash) @query["sortBy"]["limit"] = UNLIMITED end @output["limit"] = UNLIMITED end mapper = { "target" => "records", } unless @output["elements"].include?("records") @records_limit = UNLIMITED unless @dataset.single_slice? @output["elements"] << "records" @output["attributes"] ||= ["_key"] @output_records = false end @mappers["count"] = mapper end end |
#build_elapsed_time_mapper_and_reducer! ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 273 def build_elapsed_time_mapper_and_reducer! return unless @output["elements"].include?("elapsedTime") @reducers["elapsedTime"] = { "type" => "sum", } end |
#build_records_mapper_and_reducer! ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 293 def build_records_mapper_and_reducer! # Skip reducing phase for a result with no record output. return if !@output["elements"].include?("records") || @records_limit.zero? # Append sort key attributes to the list of output attributes # temporarily, for the reducing phase. After all extra columns # are removed on the gathering phase. final_attributes = output_attribute_names update_output_attributes! @reducers["records"] = build_records_reducer mapper = {} if @output_records mapper["format"] = @records_format unless @records_format == "simple" mapper["attributes"] = final_attributes unless final_attributes.empty? mapper["offset"] = @records_offset unless @records_offset.zero? mapper["limit"] = @records_limit unless @records_limit.zero? else mapper["no_output"] = true end @mappers["records"] = mapper end |
#build_records_reducer ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 396 def build_records_reducer attributes = source_column_names key_column_index = attributes.index("_key") operators = @sort_keys.collect do |sort_key| operator = ASCENDING_OPERATOR if sort_key[0] == "-" operator = DESCENDING_OPERATOR sort_key = sort_key[1..-1] end { "operator" => operator, "column" => attributes.index(sort_key), } end reducer = { "type" => "sort", "operators" => operators, } if unifiable? and !key_column_index.nil? reducer["key_column"] = key_column_index end # On the reducing phase, we apply only "limit". We cannot apply # "offset" on this phase because the collector merges a pair of # results step by step even if there are three or more results. # Instead, we apply "offset" on the gathering phase. reducer["limit"] = @output["limit"] reducer end |
#calculate_offset_and_limit! ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 134 def calculate_offset_and_limit! @original_sort_offset = sort_offset @original_output_offset = output_offset @original_sort_limit = sort_limit @original_output_limit = output_limit calculate_sort_offset! calculate_output_offset! # We have to calculate limit based on offset. # <A, B = limited integer (0...MAXINT)> # | sort limit | output limit | => | worker's sort limit | worker's output limit | final limit | # ============================= ==================================================================== # | UNLIMITED | UNLIMITED | => | UNLIMITED | UNLIMITED | UNLIMITED | # | UNLIMITED | B | => | final_offset + B | final_offset + B | B | # | A | UNLIMITED | => | final_offset + A | final_offset + A | A | # | A | B | => | final_offset + max(A, B) | final_offset + min(A, B)| min(A, B) | # XXX final_limit and final_offset calculated in many times @records_offset = final_offset @records_limit = final_limit updated_sort_limit = nil updated_output_limit = nil if final_limit == UNLIMITED updated_output_limit = UNLIMITED else if rich_sort? updated_sort_limit = final_offset + [sort_limit, output_limit].max end updated_output_limit = final_offset + final_limit end if updated_sort_limit and updated_sort_limit != @query["sortBy"]["limit"] @query["sortBy"]["limit"] = updated_sort_limit end if updated_output_limit and @output["limit"] and updated_output_limit != @output["limit"] @output["limit"] = updated_output_limit end end |
#calculate_output_offset! ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 208 def calculate_output_offset! @output["offset"] = 0 if have_records? and @output["offset"] end |
#calculate_sort_offset! ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 176 def calculate_sort_offset! # Offset for workers must be zero, because we have to apply "limit" and # "offset" on the last gathering phase instead of each reducing phase. if rich_sort? @query["sortBy"]["offset"] = 0 end end |
#final_limit ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 218 def final_limit return @original_output_limit if @dataset.single_slice? if @original_sort_limit == UNLIMITED and @original_output_limit == UNLIMITED UNLIMITED else if @original_sort_limit == UNLIMITED @original_output_limit elsif @original_output_limit == UNLIMITED @original_sort_limit else [@original_sort_limit, @original_output_limit].min end end end |
#final_offset ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 212 def final_offset return @original_output_offset if @dataset.single_slice? @original_sort_offset + @original_output_offset end |
#have_records? ⇒ Boolean
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 235 def have_records? @output["elements"].include?("records") end |
#output_attribute_names ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 317 def output_attribute_names attributes = @output["attributes"] || [] if attributes.is_a?(Hash) attributes.keys else attributes.collect do |attribute| if attribute.is_a?(Hash) attribute["label"] || attribute["source"] else attribute end end end end |
#output_limit ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 204 def output_limit @output["limit"] || 0 end |
#output_offset ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 192 def output_offset @output["offset"] || 0 end |
#rich_sort? ⇒ Boolean
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 239 def rich_sort? @query["sortBy"].is_a?(Hash) end |
#sort_attribute_names ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 381 def sort_attribute_names sort_attributes = @sort_keys.collect do |key| key = key[1..-1] if key[0] == "-" key end attributes = source_column_names sort_attributes.reject! do |attribute| attributes.include?(attribute) end sort_attributes end |
#sort_limit ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 196 def sort_limit if rich_sort? @query["sortBy"]["limit"] || UNLIMITED else UNLIMITED end end |
#sort_offset ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 184 def sort_offset if rich_sort? @query["sortBy"]["offset"] || 0 else 0 end end |
#source_column_names ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 361 def source_column_names attributes = @output["attributes"] || [] if attributes.is_a?(Hash) attributes_hash = attributes attributes = [] attributes_hash.each do |key, attribute| attributes << attribute["source"] || key end attributes else attributes.collect do |attribute| if attribute.is_a?(Hash) attribute["source"] || attribute["label"] else attribute end end end end |
#transform! ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 115 def transform! # The collector module supports only "simple" format search results. # So we have to override the format and restore it on the gathering # phase. @records_format = @output["format"] || "simple" if @output["format"] and @output["format"] != "simple" @output["format"] = "simple" end @sort_keys = @query["sortBy"] || [] @sort_keys = @sort_keys["keys"] || [] if @sort_keys.is_a?(Hash) calculate_offset_and_limit! build_count_mapper_and_reducer! build_elapsed_time_mapper_and_reducer! build_attributes_mapper_and_reducer! build_records_mapper_and_reducer! end |
#unifiable? ⇒ Boolean
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 243 def unifiable? @output["unifiable"] end |
#update_output_attributes! ⇒ Object
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# File 'lib/droonga/plugins/search/distributed_search_planner.rb', line 332 def update_output_attributes! @output["attributes"] = array_style_attributes @output["attributes"] += sort_attribute_names if unifiable? and !source_column_names.include?("_key") @output["attributes"] << "_key" end end |