add query_array

[ermolaev]

query_array faster query on 30% and comfortably use convert to hash in some cases

p conn.query_array("select 1 as a, '2' as b union select 3, 'e'").to_h
# {1 => '2', 3 => 'e'}

[SamSaffron]

Nice one, looks good to me!

[SamSaffron]

Hmmm, query_single in theory should be fastest in lots of cases, can you add that to the readme as well?

[ermolaev]

in next PR I suggest replaced code

  s = +""
  Topic.limit(1000).order(:id).pluck(:id, :title).each do |id, title|
    s << id.to_s
    s << title
  end
  s

to

  Topic.limit(1000).order(:id).pluck(:id, :title).each do |id, title|
    [id, title]
  end

because use string add unnecessary overhead into benchmarks

[SamSaffron]

Keep in mind, the benchmark is meant to create the strings, the idea behind it is "What is the fastest way of generating the same exact string from multiple libraries.

[SamSaffron]

cool lets try this out, thanks!