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https://issues.apache.org/jira/browse/CALCITE-558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14290082#comment-14290082
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Vladimir Sitnikov commented on CALCITE-558:
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{quote} But it doesn't help solve the problem that you have to translate
relational algebra into a very different language {quote}
Technically, it does. This translation is already implemented, so
AbstractNode.evaluate can bootstrap the interpreter "for free".
> Add BINDABLE convention and make it the default convention for query root
> -------------------------------------------------------------------------
>
> Key: CALCITE-558
> URL: https://issues.apache.org/jira/browse/CALCITE-558
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> The default convention is currently ENUMERABLE, which means that to execute a
> query, and in particular to use the JDBC driver, RelNodes need to be able to
> convert themselves to code. This introduces a lot of dependencies that make
> CALCITE-466 difficult to solve.
> We propose to add a new convention that can be more easily implemented by a
> RelNode, using an interpreter or otherwise.
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