Option to not specify ORDER BY

[dvilker]

Now, if you do not specify any YqlOrderBy, then ORM itself will add sorting by the primary key. But this is not always necessary.

[nvamelichev]

Having an ORDER BY primary key if no explicit sort order is specified is a good default.

We can potentially add opt-ins for "I don't care about query order", like OrderExpression.unordered(schema>)/EntityExpressions.unordered(<entity type>)/OrderBuilder.unordered() and YqlOrderBy.unordered(). Implementation for InMemory might be a no-op (and continue sorting) or (IMHO a better option) it might apply a Collections.shuffle() on the results, to uncover ordering assumptions early in the testing phase.

[nvamelichev]

@dvilker Hi Dmitry, is the opt-in variant of "don't sort the query results" suitable for your needs? If yes, it seems reasonably easy to add to YOJ, and we'll do it.