Etienne Chauchot created FLINK-21863:
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Summary: SortPartition should allow chaining of KeySelectors to
support different sorting orders for the fields
Key: FLINK-21863
URL: https://issues.apache.org/jira/browse/FLINK-21863
Project: Flink
Issue Type: Improvement
Reporter: Etienne Chauchot
If we need to sort data in a DataSet using a KeySelector (for example to
extract avro fields or when sort using field index or name is not available) we
cannot have different sort orders for the fields. We can sort by a list of
fields by making the keySelector return a tuple but they will all be sorted in
the same order.
To allow _sort by field 1 ASC, field 2 DESC_ kind of semantics with
KeySelectors we need to be able to chain the KeySelectors like this
{code:java}
DataSet.sortPartition(field1KeySelector , Order.ASCENDING)
.sortPartition(field2KeySelector, Order.DESCENDING)
{code}
which is currently not possible.
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