Github user LantaoJin commented on the issue: https://github.com/apache/spark/pull/22353 Thanks @dongjoon-hyun . That would be a problem. Seems setting to 200 or 500 are cause a limited regression on hover text. Hard code to 500 shows: <img width="215" alt="screen shot 2018-09-10 at 5 03 53 pm" src="https://user-images.githubusercontent.com/1853780/45287713-8c74a800-b51b-11e8-94aa-9d3f0cd36f28.png">
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