Add query.PredExp implement java.io.Serializable interface

[ghost]

Given that it doesn't make sense to have AerospikeClient implement Serializable interface, adding the components that can allow rebuilding the client on another hosts, should implement Serializable interface. The first step is to make query.PredExp implement Serializable interface.

[BrianNichols]

PredExp seems a bit arbitrary, but it's complex enough that implementing serializable internally may provide benefit without application code side effects. We will support this (along with serialVersionUID declaration) in the next java client release.

[ghost]

oh cool! That sounds wonderful. Given that it directly impacts the project I am working on, I am happy to work on the patch myself. I understand that the choice of PredExp may sound arbitrary, do you have any suggestions to fix it in a more elegant way?

[BrianNichols]

The PredExp changes with serialVersionUID declaration has already been implemented. I don't think there is a more elegant way.

[BrianNichols]

Java client 4.1.4 makes PredExp serializable.

https://www.aerospike.com/download/client/java/4.1.4/

[ghost]

Awesome, thank you