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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                根據用戶定義的函數類可以分為如下三種: * UDF(User-Defined-Function):自定義標準函數 * 特點:一進一出 * UDAF(User-Defined Aggregation Function):自定義聚合函數 * 特點:多進一出,類似`count/max/min`等函數 * UDTF(User-Defined Table-Generating Functions):自定義表生成函數 * 特點:一進多出,類似`lateral view explore()`函數
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