julianhyde opened a new pull request, #3937:
URL: https://github.com/apache/calcite/pull/3937

   In [CALCITE-4199](https://issues.apache.org/jira/browse/CALCITE-4199) we 
enabled CheckerFramework (via annotations and CI jobs) in the 'core' and 
'linq4j' modules; this change further enables CheckerFramework in the 'server' 
module, and fixes all violations.
   
   There are also a large number of 'cosmetic' modifications to improve code 
quality without changing behavior, including:
    * Replace `this.x = x; assert x != null;` with `this.x = 
requireNonNull(x);` in constructors
    * Replace `assert` in other code locations where it implements an 
invariant. We don't use `requireNonNull` because it throws 
`NullPointerException`; we would prefer to throw `AssertionError` or 
`IllegalStateException`
    * Replace `x.equals("")` and `x.size() == 0` with `x.isEmpty()`
    * Make fields `final` where possible
    * Make private methods and inner classes `static` where possible
    * In class `Pair<K, V>` make the type variables `K` and `V` no longer 
nullable by default (you can make each of them nullable if you need)


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