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From "Pradeep A Dalvi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (APEXMALHAR-2082) Data Filter Operator
Date Mon, 09 May 2016 16:23:12 GMT
Pradeep A Dalvi created APEXMALHAR-2082:

             Summary: Data Filter Operator 
                 Key: APEXMALHAR-2082
                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-2082
             Project: Apache Apex Malhar
          Issue Type: Bug
            Reporter: Pradeep A Dalvi

Data Filter Operator which will allow apex users to filter (select/drop) tuples based on the
certain condition from incoming stream.

Use case:
In many cases, not all tuples are of interest for the downstream operators. In such cases,
one may want select/filter out tuples to downstream. Also one may want to process tuples which
did not meet the condition/expression.

1. Any tuple for which expression could not be evaluated shall be emitted on error output

2. Filter operator shall receive POJO as input tuple and emit POJO on either of remaining
output ports i.e. truePort and falsePort. As the output ports' name signify, when condition
is met then the POJO shall be emitted on truePort and if condition is not met then that POJO
shall be emitted on falsePort.

3. Operator needs condition/expression as a input param. This condition is based on expression
language support we already have in Malhar.

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