[jira] [Created] (DRILL-3988) Create a sys.functions table to expose available Drill functions

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

Jacques Nadeau created DRILL-3988:
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             Summary: Create a sys.functions table to expose available Drill functions
                 Key: DRILL-3988
                 URL: https://issues.apache.org/jira/browse/DRILL-3988
             Project: Apache Drill
          Issue Type: Improvement
          Components: Metadata
            Reporter: Jacques Nadeau


Create a new sys.functions table that returns a list of all available functions.

Key considerations: 
- one row per name or one per argument set. I'm inclined to latter so people can use queries to get to data.
- we need to create a delineation between user functions and internal functions and only show user functions. 'CastInt' isn't something the user should be able to see (or run).
- should we add a description annotation that could be included in the sys.functions table?




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