zjffdu opened a new pull request #3729: [ZEPPELIN-4740]. Display streaming data in flink table api URL: https://github.com/apache/zeppelin/pull/3729 ### What is this PR for? This PR is to allow user to display streaming data in flink table api just like displaying streaming data in stream sql (%flink.ssql). I implement it in both scala and pyflink. Here's one example in flink scala table api ``` val table = stenv.from("cdn_access_log") .select("uuid, ip_to_province(client_ip) as province, response_size, request_time") .groupBy("province") .select( "province, count(uuid) as access_count, sum(response_size) as total_download, sum(response_size) * 1.0 / sum(request_time) as download_speed") z.show(table, streamType="update") ``` ### What type of PR is it? [Feature ] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4740 ### How should this be tested? Unit test is added and also verify it manually. ### 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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