[jira] [Resolved] (DRILL-30) Implement Sequence Reference Operator

["Jacques Nadeau (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-30?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jacques Nadeau resolved DRILL-30.
---------------------------------

    Resolution: Fixed
    
> Implement Sequence Reference Operator
> -------------------------------------
>
>                 Key: DRILL-30
>                 URL: https://issues.apache.org/jira/browse/DRILL-30
>             Project: Apache Drill
>          Issue Type: New Feature
>            Reporter: Timothy Chen
>              Labels: logical
>
> Sequence (1)
> Sequence is a syntactic operator to ease the definition of simple flows.  Since the vast majority of operators are single input operators, sequence allows one to define a 1:1:1...1 flow without having to specifically define input and definition references.  All elements beyond the first element in a sequence must be single input operators.  The first element must either be a source operator or a single input operator.  The last element of a sequence will can be a sink.  The sequence will be a sink if and only if the last element of the sequence is a sink.
> { @id: <opref>, op: “sequence”, 
>   input: <input>, do: [
> 	<operator>, <operator>, ... <operator>
>   ]
> }

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