juripetersen commented on PR #385:
URL: https://github.com/apache/incubator-wayang/pull/385#issuecomment-1842213546
I can imagine using something like this when defining the Join:
```java
final ExecutionOperator joinOperator = new
HsqldbJoinOperator<Integer>(
new JoinDescriptor<Record, Record, Integer>(
"tableName1",
"tableName2",
"keyName1",
"keyName2",
Record.class,
Record.class,
Integer.class
)
);
```
Where `JoinDescriptor` extends `TransformationDescriptor` and
`JdbcJoinOperator` can only be derived from `JoinOperator`s that are defined
with `JoinDescriptor`.
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