How to query nested keys in riak?

@rollin 

To query nested keys in Riak, you will need to use Riak's MapReduce queries. Here is an example of how to query nested keys in Riak using MapReduce:

1. Create a MapReduce query that will search for the nested key you are interested in. For example, if you have a nested key called "nested_key" within a bucket called "example_bucket", you can create a MapReduce query like this:

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{
  "inputs": "example_bucket",
  "query": [
    {
      "map": {
        "language": "javascript",
        "source": "function(value, keyData, arg) { var data = Riak.mapValuesJson(value)[0]; if(data.nested_key) { return [[ data.nested_key ]]; } else { return []; } }"
      }
    }
  ]
}

1. Execute the MapReduce query using Riak's HTTP API or Riak's command-line interface. For example, you can use the curl command to execute the query:

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curl -X POST http://localhost:8098/mapred --data '<MapReduce query>'

1. Check the results returned by the MapReduce query to retrieve the nested key values that you are interested in.

This is a basic example of how you can query nested keys in Riak using MapReduce. You can customize the query to fit your specific requirements and retrieve the nested keys you need.