Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/2297
@StephanEwen I renamed `EMPTY_STRING` to `EMPTY_COLUMN`. All parsers that
have a "format" (like Double, Boolean, Integer etc.) return `-1` and set
`EMPTY_COLUMN`. The `StringParser` returns the String but sets `EMPTY_COLUMN`
in case no quoting could be found.
So in `..,12,,xyz,..` the column `,,` will always be set as `EMPTY_COLUMN`
consistently across all parsers.
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