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From "Julian Hyde (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NIFI-1280) Create FilterCSVColumns Processor
Date Fri, 13 May 2016 04:49:12 GMT

    [ https://issues.apache.org/jira/browse/NIFI-1280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15282398#comment-15282398
] 

Julian Hyde commented on NIFI-1280:
-----------------------------------

Another possible integration with Calcite would be for Nifi to be a source for streaming (i.e.
continuously executing) Calcite queries. Calcite wouldn't be embedded in Nifi, but rather,
Calcite (or a streaming engine such as Flink, Storm, Samza, Apex, Beam) would continuously
read from Nifi. These queries would be continuous and would therefore start with the words
"select stream ...".

> Create FilterCSVColumns Processor
> ---------------------------------
>
>                 Key: NIFI-1280
>                 URL: https://issues.apache.org/jira/browse/NIFI-1280
>             Project: Apache NiFi
>          Issue Type: Task
>          Components: Extensions
>            Reporter: Mark Payne
>            Assignee: Toivo Adams
>
> We should have a Processor that allows users to easily filter out specific columns from
CSV data. For instance, a user would configure two different properties: "Columns of Interest"
(a comma-separated list of column indexes) and "Filtering Strategy" (Keep Only These Columns,
Remove Only These Columns).
> We can do this today with ReplaceText, but it is far more difficult than it would be
with this Processor, as the user has to use Regular Expressions, etc. with ReplaceText.
> Eventually a Custom UI could even be built that allows a user to upload a Sample CSV
and choose which columns from there, similar to the way that Excel works when importing CSV
by dragging and selecting the desired columns? That would certainly be a larger undertaking
and would not need to be done for an initial implementation.



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