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https://issues.apache.org/jira/browse/CALCITE-663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14481641#comment-14481641
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Julian Hyde commented on CALCITE-663:
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The design was a straw man. It sounds as if you know how you would solve this -
I'm happy to go with your proposal.
Do we want to get this (or part of this) into Calcite 1.2? We have about 24
hours before RC 1.
> Would it be better to have a means for feature inspection?
Yes. I would keep version, as a convenient short-hand for a list of methods,
but also allow individual features to be described.
> One goal we have is to allow for session-less utilization of the query server.
That's a big one. We should discuss in a separate JIRA case. I was thinking we
could allow a single round-trip to include a batch of requests, say
[CreateConnection, CreateStatement, ExecuteStatement, Fetch] and have some way
for request N to refer to IDs generated by requests 0..N-1.
> Add CreateConnectionRequest and protocol version to Avatica protocol
> --------------------------------------------------------------------
>
> Key: CALCITE-663
> URL: https://issues.apache.org/jira/browse/CALCITE-663
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Labels: avatica
>
> Add protocol version to Avatica protocol, to allow forwards and backwards
> compatibility.
> The first request should be a CreateConnectionRequest, let's add the
> attributes there. I propose:
> * CreateConnectionRequest.requestedProtocolType e.g. "json"
> * CreateConnectionRequest.requestedProtocolVersion e.g. "1.2.0"
> * CreateConnectionRequest.driverVersion
> * CreateConnectionRequest.driverName e.g.
> "org.apache.calcite.avatica.remote.Driver"
> * CreateConnectionResponse.protocolType
> * CreateConnectionResponse.protocolVersion
> * CreateConnectionResponse.databaseVersion
> There is currently no CreateConnectionRequest.
> Certain servers configurations would continue to allow connections to be
> implicitly created, but using an explicit CreateConnectionRequest would
> always be possible.
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