Abdullah Alamoudi closed ASTERIXDB-2194.
    Resolution: Fixed

> Introduce datasource functions
> ------------------------------
>                 Key: ASTERIXDB-2194
>                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-2194
>             Project: Apache AsterixDB
>          Issue Type: Improvement
>          Components: COMP - Compiler
>            Reporter: Abdullah Alamoudi
>            Assignee: Abdullah Alamoudi
>            Priority: Major
> Sometimes, we would like to be able to query system status. For example:
>    1. Disk space.
>    2. Number of components of a dataset.
>    3. Memory usage.
> And many others. Being able to query such information and utilize the power 
> of the query language and the runtime makes a great investigative/diagnostic 
> tool.
> Currently, there is no easy way to do that. Such functionality can be 
> achieved through:
> 1. External datasets but that takes a lot of work in terms of development and 
> usage.
> 2. Use specific diagnostic end points but then that is also a lot of 
> development work and you end up losing the ability to use the query language.
> Current proposal is to introduce datasource functions. A datasource function 
> is different from normal functions as:
> 1. Takes constants ( as opposed to variables).
> 2. Has location constraints "For a start, it can be on all nodes".
> An example would be the function dataset_resources(String dataverse, String 
> dataset);
> This function takes a dataverse and a dataset and produce a set of json 
> representing the disk resources of the dataset.

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