Github user felixcheung commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/328#issuecomment-144271689
I guess it's not required but the name is used as the group if absent
Interpreter.java
```
public static void register(String name, String className) {
register(name, name, className);
}
public static void register(String name, String group, String className) {
register(name, group, className, new HashMap<String,
InterpreterProperty>());
}
public static void register(String name, String group, String className,
Map<String, InterpreterProperty> properties) {
registeredInterpreters.put(group + "." + name, new
RegisteredInterpreter(
name, group, className, properties));
}
```
Agreed if there is only one interpreter in the group then it's better to
have `%sh` instead of `%sh.sh`
Ideally we should know if the interpreter is the default of its group in
that case we could list `%spark, %spark.pyspark, %spark.sql, %spark.dep`?
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