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https://issues.apache.org/jira/browse/APEXMALHAR-2015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chinmay Kolhatkar closed APEXMALHAR-2015.
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Resolution: Fixed
Fix Version/s: 3.4.0
> Projection Operator
> -------------------
>
> Key: APEXMALHAR-2015
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2015
> Project: Apache Apex Malhar
> Issue Type: New Feature
> Reporter: Pradeep A Dalvi
> Fix For: 3.4.0
>
>
> Projection Operator will allow apex users to project (select/drop) certain
> fields from the incoming tuples. This operation might be done unconditionally
> or based on certain condition.
> Use case:
> -------------
> Not all fields of tuples are of interest for the downstream operators. In
> such cases, one may want project selective fields to downstream. Also one may
> want to drop few fields, instead of selecting many.
> In certain scenarios, one may want to project certain fields based on given
> condition or expression.
> Functionality:
> -----------------
> 1. Projection operator shall receive POJO as input tuple and emit 2 POJOs on
> separate output ports i.e. selected and dropped. Selected output port shall
> emit POJO with selected fields and dropped output shall emit POJO of dropped
> fields.
> 2. Operator needs select or drop fields as input params. This shall be
> specified using comma separated list of fields.
> 3. Operator shall emit POJO only on connected output ports. In another words,
> if dropped output port is not connected, it shall not even try to generate
> POJOs with dropped fields.
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