See my comments below.

Unfortunately, that doesn't add much more detail to what exactly failed
> here...
>

Since it says that map query failed on node
4d469cd1-1448-4f4e-a1bc-65f1d746a504 you need to check logs on that node. I
think there exception should be more informative.


> I can't paste the code as it is owned by a client, but the problem seems
> clearly related to the use of the IN operator.


If I don't know steps to reproduce the issue, I can't help you. I suggest
you to write a simple artificial test reproducing the problem, it will save
us lots of time. Most probably IN operator works correctly but you do
something wrong.


> Is it OK to pass the set
> parameter of the query as a java.util.Set?


Again, I'm not sure what do you mean by that. How the query looks like? How
do you set query arguments?


> I couldn't find an actual example
> of a SqlQuery with an IN operator. Is there maybe some test code in the
> Ignite project that uses this feature and could serve as an example?
>
>
You can look at GridCacheCrossCacheQuerySelfTest, I modified some existing
there queries to check if IN operator works correctly and it does. The
problem is most probably in incorrect usage.

Sergi




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