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Nagarajan Chinnasamy commented on DRILL-5043:
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Thanks for the references.
Went through QueryContext.java, UserSession.java and ContextFunctions.java and
understood how ContextInformation instance is injected into a function.
As per my understanding, there is no property in UserSession that can give a
unique-id to represent a user session. So UserSession needs to be modified to
introduce a new property that represents a session_id. But, I want to know what
are the considerations that should go into having such a property. Can it be a
simple "static" variable? what should be its datatype? Any clustered
environment related points that I should take care???!!!! Is there already
existing unique-id generator utility function that I can make use of?
Does it have to be a UDF? Why not another one of ContextFunctions???
Appreciate your inputs. Thanks.
> Function that returns a unique id per session/connection similar to MySQL's
> CONNECTION_ID()
> -------------------------------------------------------------------------------------------
>
> Key: DRILL-5043
> URL: https://issues.apache.org/jira/browse/DRILL-5043
> Project: Apache Drill
> Issue Type: Improvement
> Components: Functions - Drill
> Affects Versions: 1.8.0
> Reporter: Nagarajan Chinnasamy
> Priority: Minor
> Labels: CONNECTION_ID, SESSION, UDF
>
> Design and implement a function that returns a unique id per
> session/connection similar to MySQL's CONNECTION_ID().
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