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Posted to dev@drill.apache.org by "Jacques Nadeau (JIRA)" <ji...@apache.org> on 2013/02/01 17:08:12 UTC
[jira] [Commented] (DRILL-30) Implement Sequence Reference Operator
[ https://issues.apache.org/jira/browse/DRILL-30?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13568830#comment-13568830 ]
Jacques Nadeau commented on DRILL-30:
-------------------------------------
I believe this is already done. Please reopen if not.
> 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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