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https://issues.apache.org/jira/browse/CALCITE-785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14614395#comment-14614395
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Ted Dunning commented on CALCITE-785:
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Didn't somebody already do pretty much this in the Drill project?
Or was it that they just tweaked the Pig parser to generate a Drill plan?
> Add "Piglet", a subset of Pig Latin on top of Calcite algebra
> -------------------------------------------------------------
>
> Key: CALCITE-785
> URL: https://issues.apache.org/jira/browse/CALCITE-785
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> Implement a subset of Pig Latin on top of Calcite, mapping it onto Calcite
> algebra (via RelBuilder) that can then be optimized and executed on any
> back-end.
> This serves several purposes:
> * Illustrate how to implement a data language on Calcite
> * Clear technical roadblocks so that the real Pig can be implemented on
> Calcite
> * Strengthen Calcite's support for nested collections and related operations
> such as cogroup
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