Github user dukechain commented on a diff in the pull request:
https://github.com/apache/incubator-flink/pull/194#discussion_r20141144
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/operators/ProjectOperator.java
---
@@ -93,6 +113,30 @@ public Projection(DataSet<T> ds, int[] fieldIndexes) {
this.fieldIndexes = fieldIndexes;
}
+ public void acceptAdditionalIndexes(int... additionalIndexes) {
--- End diff --
In order to remove types() call in project(), project() should return a
ProjectOperator object. As projectOperator inherites from DataSet, Hence, at
user-end, there is no compiling error for chained projection like
dataset.project(0).project(1). If we do not accept the additional index, the
run-time result would be wrong.
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