Class: Queris::Query::UnionOp

Inherits:
Op
  • Object
show all
Defined in:
lib/queris/query/operations.rb

Direct Known Subclasses

DiffOp

Constant Summary collapse

COMMAND = 
:zunionstore
SYMBOL = 
:'∪'
NAME = 
:union
OPTIMIZATION_THRESHOLD_MULTIPLIER = 
3

Instance Attribute Summary

Attributes inherited from Op

#fragile, #operands

Instance Method Summary collapse

Methods inherited from Op

#command, #initialize, #json_redis_dump, #keys, #marshal_dump, #notready!, #operand_key, #operand_key_weight, #optimized?, #prepare, #push, #query_run_stage_inspect, #query_run_stage_release, #run, #subqueries, #symbol, #target_key_weight, #temp_keys, #temp_keys?, #to_s, #weights

Constructor Details

This class inherits a constructor from Queris::Query::Op

Instance Method Details

#optimize(smallkey, smallsize, page = nil) ⇒ Object 



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# File 'lib/queris/query/operations.rb', line 304

def optimize(smallkey, smallsize, page=nil)
  m = self.class::OPTIMIZATION_THRESHOLD_MULTIPLIER
  super do |key, size, op|
    if op.is_query? && !op.index.paged?
      #puts "optimizing unpaged subquery #{op.index} later"
      op.delayed_optimize_query(smallkey, m)
    elsif smallsize * m < size
      #puts "optimization reduced union(?) operand #{op} from #{size} to #{smallsize}"
      op.preintersect(smallkey, key)
    elsif page && page.size * m < size
      #puts "paging reduced union(?) operand #{op} from #{size} to #{page.size}"
      op.preintersect(page.key, key)
    end
  end
  return smallkey, smallsize
end