Github user qmlmoon commented on the pull request:
https://github.com/apache/incubator-flink/pull/47#issuecomment-59612985
To allow strings as delimiters, we need `FieldPareser` accepts string
delimiter, which is similar to allow strings as field delimiter in
`CsvInputFormat`.
[Flink-1168](https://issues.apache.org/jira/browse/FLINK-1168?jql=project%20%3D%20FLINK)
also has this proposal.
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