I want to reuse queries, and I know it is possible to change parameter, but how does one change the condition? And do we have to always call query.close()?
How to change query condition (not parameter)?
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For a built query only the parameter values can be changed. To get different conditions (== new query) a new query needs to be built.
And yes, calling query.close() is recommended to immediately free used resources. However, it's fine to keep a query around if your code will use it again.
https://docs.objectbox.io/queries#reusing-queries-and-parameters