Array types are not working with query cache

[victornoel]

Describe the bug

Because

• array types require that values are specified using a java array
• QueryKey used by hibernate's query cache simply wraps the values inside a Map
• and most cache simply delegates to the Map's equals/hashCode

Then the query cache is not able to detect that two same queries with the same parameters involving some array type from this library are actually equal and so the cache is never exploited.

To Reproduce

Not sure how to reproduce it but I think the definition above is enough so that you can tell me if my understanding is correct.

If it is, with your guidance, I can try to make a PR to fix it :)

[vladmihalcea]

You can use this test case as a reference for the replicating test case.

After you create the test case, you can see whether the fix will make it pass.

[victornoel]

FYI I have a fix ready, I need to polish a bit the tests and I will create a PR before end of next week :)