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SELECT
  category,
  segment,
  SUM(exposures) AS exposures,
  SUM(impressions)/(SUM(exposures) - SUM(indeterminate_visibility)) AS impression_rate,
  SUM(engagements)/SUM(exposures) AS engagement_rate
FROM (
	  SELECT
	    date,
	    ad_id,

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~% rvm --trace wrapper 1.8.7@wukong wukong                       15:19 reventon
+__rvm_parse_args:414> [[ -z 4.3.9 ]]
+__rvm_parse_args:570> [[ -z '' && -n '' ]]
+__rvm_parse_args:572> [[ 0 -eq 1 || -n '' ]]
+__rvm_parse_args:15> [[ -n wrapper ]]
+__rvm_parse_args:17> rvm_token=wrapper 
+__rvm_parse_args:19> [[ 2 -gt 0 ]]
+__rvm_parse_args:19> next_token=1.8.7@wukong 
+__rvm_parse_args:19> shift
+__rvm_parse_args:21> case wrapper (fetch|version|srcdir|reset|debug|reload|update|monitor|notes|implode|seppuku|question|answer|env)

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~% cat .rvm/bin/wukong_\                                                                                                                                                15:21 reventon
#!/usr/bin/env bash

if [[ -s "/Users/theo/.rvm/environments/ruby-1.8.7-p302@wukong" ]] ; then
  \. "/Users/theo/.rvm/environments/ruby-1.8.7-p302@wukong"
  exec   "$@"
else
  echo "ERROR: Missing RVM environment file: '/Users/theo/.rvm/environments/ruby-1.8.7-p302@wukong'" >&2
  exit 1
fi

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#!/usr/bin/env ruby

require 'zlib'
require 'open-uri'
require 'json'


io = Zlib::GzipReader.new(open("http://api.stackoverflow.com/1.0/questions?tagged=redis&sort=votes&min=1"))
obj = JSON.parse(io.read)

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Result of running bm.rb four times (which runs 100K iterations of encode or decode 
over a set of values), taking the "user" column from the results:

+------------------+--------+---------+---------+---------+---------+
|                  | Method | 1st run | 2nd run | 3rd run | 4th run |
+------------------+--------+---------+---------+---------+---------+
| Baseline         | Decode |    1.92 |    1.92 |    1.94 |    2.22 |
|                  | Encode |    1.90 |    1.91 |    1.91 |    1.92 |
+------------------+--------+---------+---------+---------+---------+
| Constant Strings | Decode |    2.07 |    1.81 |    1.82 |    1.84 |

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% brew install -vd imagemagick
/usr/local/bin/git
==> Cloning git://github.com/adamv/ImageMagick.git
Updating /Users/theo/Library/Caches/Homebrew/imagemagick--git
git fetch git://github.com/adamv/ImageMagick.git
From git://github.com/adamv/ImageMagick
 * branch            HEAD       -> FETCH_HEAD
==> Checking out ref fdb125591a17a4002798742014118d5cfee44394
git checkout-index -a -f --prefix=/private/tmp/homebrew-imagemagick-6.6.7-10-dXf5/
==> ./configure --disable-osx-universal-binary --without-perl --prefix=/usr/local/Cellar/imagemagick/6.6.7-10 --disable-dependency-tracking --enable-shared --disable-static --with-modules --without-gslib --without-magick-plus-plus

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require 'mongo'

mongo = Mongo::Connection.new
db = mongo.db('test')
collection = db.collection('helloworld')
collection.remove
collection.insert({:x => 3})
collection.insert({:x => 2})
collection.insert({:x => 5})

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# This monkey patches tmm1's amqp gem to handle Basic Return

module AMQP
  class ConsumerHijacker
    attr_reader :header, :body
    
    def receive(header, body)
      @header, @body = header, body
    end
    

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CHUNK_SIZE = 1024 * 1024
EMPTY_STRING = ''.freeze
NEWLINE = "\n".freeze

# line_enum('path/to/huge/file').each do |line|
#   puts line
# end
def line_enum(path)
  Enumerator.new do |y|
    File.open(path) do |io|

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=ERROR REPORT==== 18-May-2011::14:20:55 ===
** Generic server <0.15956.26> terminating
** Last message in was {'$gen_cast',emit_stats}
** When Server state == {ch,running,rabbit_framing_amqp_0_9_1,2,<0.15950.26>,
                            <0.15955.26>,<0.15950.26>,<0.15957.26>,
                            #Fun<rabbit_channel_sup.0.15412730>,none,
                            {set,0,16,16,8,80,48,
                                {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],
                                 []},
                                {{[],[],[],[],[],[],[],[],[],[],[],[],[],[],