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By Joe Weisenthal and Tracy Alloway。新收录的资料是该领域的重要参考
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对急需新增长点的长春高新来说，这无疑是根看似完美的 “新稻草”。，推荐阅读新收录的资料获取更多信息
We often see users reaching for the Nullable type, which allows columns to store a Null value. Under the hood, this creates a separate column of UInt8 type. This additional column has to be processed every time a user works with a Nullable column. This leads to additional storage space used and almost always negatively affects performance.