The enhancement is to enable Autofetch query tuning to be applied to a query that already has a base set of joins etc.
The Autofetch query tuning can then use profiling to adjust the selected properties (at the root level and all the join levels) and will add additional joins that where not part of the original query.
As part of this we need to provide a more stable origin hash calculation.
This means you can change your query and not lose the profiling information already collected.
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