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From "Paul Rogers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5181) Storage plugins have no visibility to session options
Date Mon, 09 Jan 2017 16:53:58 GMT
Paul Rogers created DRILL-5181:

             Summary: Storage plugins have no visibility to session options
                 Key: DRILL-5181
                 URL: https://issues.apache.org/jira/browse/DRILL-5181
             Project: Apache Drill
          Issue Type: Improvement
    Affects Versions: 1.8.0
            Reporter: Paul Rogers

Storage plugins are defined as global constructs: they span multiple user sessions.

Individual actions (table lookups, scan creation) operate within the context of a single query
operating within a specific user session.

The storage plugin API has no concept of session or query: all items are global or highly
local (ask for a table, but with no connection to session or query, just a request without

These semantics are fine for resources without permissions or state. But if a plugin wants
to provide session options, it cannot do so at plan time. If a plugin wants to provide a user-specific
view of the world, or wants to restrict actions based on user identity, it cannot do so at
plan time.

The workaround may be to give the planner "God" permissions, but enforce specifics at execution
time when the user and session information is known. This does, however, prevent the planner
from making use of user-specific information.

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