zjffdu opened a new pull request #3715: [ZEPPELIN-4714]. Flink table api doesn't work in multiple threads URL: https://github.com/apache/zeppelin/pull/3715 ### What is this PR for? This PR is to fix the issue of FLINK-16936 by a workaround, already creating tableenv before execution scala or python code. Building tablenv is pretty light which won't cost much time. So it is acceptable for this workaround. Another this PR try to fix is the ClassLoader issue for PyFlinkInterpreter. This PR will always set classloader before executing python code so that pyflink api can call udf defined in scala. ### What type of PR is it? [Bug Fix ] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4714 ### 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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