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https://issues.apache.org/jira/browse/DRILL-13?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603228#comment-13603228
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Miguel Branco commented on DRILL-13:
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I don't have concrete thoughts on this but a few points:
- JOIN-pushdowns are useful, where the storage engine is smart enough to
locally join data before shipping it up
- The PostgreSQL foreign data wrappers API might be a useful reference:
http://www.postgresql.org/docs/9.2/static/fdw-functions.html . This is work in
progress but e.g. join-pushdowns were smtg being discussed
- Jacques mentioned incremental schema support. That's critical and I'm
guessing it will be decisive to this interface.
- Perhaps something in the lines of rule-based query rewrites would be useful.
Engines advertise rules that get applied to the plan.
> Storage Engine: Define Java Interface
> -------------------------------------
>
> Key: DRILL-13
> URL: https://issues.apache.org/jira/browse/DRILL-13
> Project: Apache Drill
> Issue Type: Task
> Reporter: Jacques Nadeau
> Assignee: Jacques Nadeau
>
> We're going to need to define a storage engine API. At a minimum, we'll need
> to generate a Java one. We will probably need to also create a CPP one.
> This task is for the former. Things that are likely to be included in a the
> Java interface are: reader (scanner), writer, capabilities interface, schema
> interface, statistics interface, data layout and ordering
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