zsxwing opened a new pull request #27732: [SPARK-30984][SS]Add UI test for Structured Streaming UI URL: https://github.com/apache/spark/pull/27732 ### What changes were proposed in this pull request? - Add a UI test for Structured Streaming UI - Fix the unsafe usages of `SimpleDateFormat` by using a ThreadLocal shared object. - Use `start` to replace `submission` to be consistent with the API `StreamingQuery.start()`. ### Why are the changes needed? Structured Streaming UI is missing UI tests. ### Does this PR introduce any user-facing change? No ### How was this patch tested? The new test.
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