[jira] [Commented] (FLINK-1919) Add HCatOutputFormat for Tuple data types

["James Cao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-1919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14735873#comment-14735873 ] 

James Cao commented on FLINK-1919:
----------------------------------

pull request for this issue:
https://github.com/apache/flink/pull/1079

> Add HCatOutputFormat for Tuple data types
> -----------------------------------------
>
>                 Key: FLINK-1919
>                 URL: https://issues.apache.org/jira/browse/FLINK-1919
>             Project: Flink
>          Issue Type: New Feature
>          Components: Java API, Scala API
>            Reporter: Fabian Hueske
>            Assignee: James Cao
>            Priority: Minor
>              Labels: starter
>
> It would be good to have an OutputFormat that can write data to HCatalog tables.
> The Hadoop `HCatOutputFormat` expects `HCatRecord` objects and writes these to HCatalog tables. We can do the same thing, by creating these `HCatRecord` object with a Map function that precedes a `HadoopOutputFormat` that wraps the Hadoop `HCatOutputFormat`.
> Better support for Flink Tuples can be added by implementing a custom `HCatOutputFormat` that also depends on the Hadoop `HCatOutputFormat` but internally converts Flink Tuples to `HCatRecords`. This would also include to check if the schema of the HCatalog table and the Flink tuples match. For data types other than tuples, the OutputFormat could either require a preceding Map function that converts to `HCatRecords` or let users specify a MapFunction and invoke that internally.
> We have already a Flink `HCatInputFormat` which does this in the reverse directions, i.e., it emits Flink Tuples from HCatalog tables.



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