[jira] [Created] (DRILL-3572) Provide a simple interface to append metadata to files and directories

["Jacques Nadeau (JIRA)" <ji...@apache.org>]

Jacques Nadeau created DRILL-3572:
-------------------------------------

             Summary: Provide a simple interface to append metadata to files and directories
                 Key: DRILL-3572
                 URL: https://issues.apache.org/jira/browse/DRILL-3572
             Project: Apache Drill
          Issue Type: Bug
          Components: Storage - Other
            Reporter: Jacques Nadeau
            Assignee: Jacques Nadeau
             Fix For: 1.3.0


We need a way to store small amounts of metadata about a file or a collection of files.  The current thinking was a way to have a "dot drill file" that ascribes metadata to a particular asset. 

Initial example file might be something that includes the following:

{code}
{
  // Drill version identifier
  version: "dd1"  
  
  // Format Plugin Configuration
  format: {  
    type: "httpd", 
    format: "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" \"%{Cookie}i\""}
  },
  
  // Traits of underlying data (a.k.a physical properties)
  traits: [ // traits of the underlying data
    {type: "sort_nulls_first", columns: ["request.uri", "client.host"]}
    {type: "unique", columns ["abc"]}
    {type: "unqiue", columns ["xy", "zz"]}
  ],
  
  // Mappings between directory names and exposed columns
  dirs: [
    {skip: true}, // don't include this directory name in the directory path.
    {name: "year", type: "integer"},
    {name: "month", type: "integer"},
    {name: "day", type: "integer"}
  ],
  
  // whether or not a user can add new columns to the table through insert
  rigid_table: true
  
}

{code}


We also need to support adding more machine-generated/managed data such as statistics.  That should be done using a separate file from the one that is human description.

A user should be able to ascribe this metadata directly through the file system as well as through sql commands such as 
{code}
ALTER TABLE ADD METADATA ...
{code}



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