mysql-compatibility: Improve MySQL Compatibility (#3151)#3174

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pingcap:release-4.0from

ti-srebot:release-4.0-061857f369ec

Jul 6, 2020

Commits on Jul 6, 2020

cherry pick #3151 to release-4.0

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Update mysql-compatibility.md
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Merge branch 'release-4.0' into release-4.0-061857f369ec
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