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https://issues.apache.org/jira/browse/DRILL-29?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacques Nadeau reassigned DRILL-29:
-----------------------------------
Assignee: Christopher Merrick
> Implement Flatten Reference Operator
> ------------------------------------
>
> Key: DRILL-29
> URL: https://issues.apache.org/jira/browse/DRILL-29
> Project: Apache Drill
> Issue Type: New Feature
> Reporter: Timothy Chen
> Assignee: Christopher Merrick
> Labels: logical
>
> Flatten (1)
> Flatten will generate one or more output records based on a single input
> record. The output record will be the input record along with an appended
> additional appended field(s) for the flattening. The specific behavior
> depends upon the type of the flatten expression provided. In all cases, the
> drop parameter defines whether or not all fields referenced in the target
> expression are maintained in the output record or removed.
> Scalar/Map: In the case that the provided expression returns a scalar or map,
> flatten will return a single record for each input record with one additional
> field at the ref location defined with the same value as the input
> expression.
> Array: If the provided expression returns an array, flatten will return
> multiple copies of the original input record where each is appended with the
> value within the array at the ref position.
> { @id†: <opref>, op: “flatten”,
> input†: <input>,
> ref: <name>,
> expr: <expr>,
> drop: <boolean>
> }
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