zjffdu opened a new pull request #3464: [ZEPPELIN-4354]. Enhance z.angular for more flexiable data sharing URL: https://github.com/apache/zeppelin/pull/3464 ### What is this PR for? This PR enhance method `z.angular` in `%spark.r` and `%spark.pyspark` so that angular variables defined in frontedn can be shared in backend `%spark`, `%spark.r`, `%spark.pyspark` ### What type of PR is it? [ Improvement | Feature ] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4354 ### How should this be tested? * CI pass ### 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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