zjffdu opened a new pull request #3628: [ZEPPELIN-4593]. Failed to get completion in ShinyInterpreter URL: https://github.com/apache/zeppelin/pull/3628 ### What is this PR for? The root cause is that we didn't implement `completion` method, so it would always return null which cause the error. This PR fix it by always return empty List for `completion` method in `AbstractInterpreter`. ### What type of PR is it? [Bug Fix] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4593 ### How should this be tested? * Tested manully ### Screenshots (if appropriate) ### Questions: * Does the licenses files need update? No * Is there breaking changes for older versions? No * Does this needs documentation? No
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