presto-main/src/main/java/io/prestosql/metadata/BoundVariables.java/BoundVariables/setValue
class BoundVariables:    private static <T> void setValue(Map<String, T> map, String variableName, T value)
    {
        checkState(variableName != null, "variableName is null");
        checkState(value != null, "value for variable '%s' is null", variableName);
        map.put(variableName, value);
    }