Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/2810
Hi @tonycox , the
[`RowCsvInputFormat`](https://github.com/apache/flink/blob/master/flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/runtime/io/RowCsvInputFormat.scala#L100)
read columns from left to right and write the value into `holders`. I mean we
should have a `fieldMapping` to determine this value should be put into
`holders` under which index.
I think it will have a better performance than applying a map after that.
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