[jira] [Created] (FLINK-2692) Untangle CsvInputFormat into PojoTypeCsvInputFormat and TupleTypeCsvInputFormat

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-2692:
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             Summary: Untangle CsvInputFormat into PojoTypeCsvInputFormat and TupleTypeCsvInputFormat 
                 Key: FLINK-2692
                 URL: https://issues.apache.org/jira/browse/FLINK-2692
             Project: Flink
          Issue Type: Improvement
            Reporter: Till Rohrmann
            Priority: Minor


The {{CsvInputFormat}} currently allows to return values as a {{Tuple}} or a {{Pojo}} type. As a consequence, the processing logic, which has to work for both types, is overly complex. For example, the {{CsvInputFormat}} contains fields which are only used when a Pojo is returned. Moreover, the pojo field information are constructed by calling setter methods which have to be called in a very specific order, otherwise they fail. E.g. one first has to call {{setFieldTypes}} before calling {{setOrderOfPOJOFields}}, otherwise the number of fields might be different. Furthermore, some of the methods can only be called if the return type is a {{Pojo}} type, because they expect that a {{PojoTypeInfo}} is present.

I think the {{CsvInputFormat}} should be refactored to make the code more easily maintainable. I propose to split it up into a {{PojoTypeCsvInputFormat}} and a {{TupleTypeCsvInputFormat}} which take all the required information via their constructors instead of using the {{setFields}} and {{setOrderOfPOJOFields}} approach.



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