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Note that the above list of operator examples is not exhaustive.
E.g. There is only one example with a 'ValueJoinerWithKey'. All other examples pass a 'ValueJoiner' into the operator.In the pull request all relevant Javadocs will be updated with the information on how to keep the old behavior for a given operator / method.

Moreover, we will hint to the DSL users via Java docs that they have now have the option to distinguish between the following scenarios within a left join operator:
"null-key" v.s. "not-null-key but null-value" by passing a 'ValueJoinerWithKey' instead of 'ValueJoiner' to the left join operator.
The remark will be made in the Java docs of all left join methods with a 'ValueJoiner' as a parameter.

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