Creates a Generic universal parser that can access many tabular databases, and perform SQL queries.

The databases can be heterogenic, so you can perform searches mixing data from postgres, mysql, csv or Google Analytics.

For example:

  iex> {:ok, result} = ExoSQL.query(
  ...>   "SELECT urls.url, status_code FROM urls INNER JOIN request ON request.url = urls.url",
  ...>    %{
  ...>      "A" => {ExoSQL.Csv, path: "test/data/csv/"},
  ...>      "B" => {ExoSQL.HTTP, []}
  ...>    })
  ...> ExoSQL.format_result(result)
  '''
  A.urls.url | B.request.status_code
  -------------------------------------
  https://serverboards.io/e404 | 404
  http://www.facebook.com | 302
  https://serverboards.io | 200
  http://www.serverboards.io | 301
  ''' |> to_string

It also contains functions for all the steps of the process: parse |> plan |> execute. They can be useful for debugging pourposes.

Finally there are helper functions as explain that prints out an explanation of the plan, and format_result for pretty printing results.