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

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-1919:
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             Summary: 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
            Priority: Minor


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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