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IP屬地:河北
  • 大佬验毡,有入門的資料嗎?

    flowable 流程引擎總結(jié)

    最近公司使用Flowable開發(fā)了自己的OA系統(tǒng),因此對Flowable的相關(guān)內(nèi)容進行如下總結(jié) 一、Flowable 是什么 目前最新版是Flowable 6.4.2(201...

  • 我們現(xiàn)在也要用這個 以前沒接觸過 請問怎么樣開始??

  • 我也覺得是這樣,但是我去面試的時候說DataFrame是DataSet的子集,面試官驚訝(他覺得我說的是錯的)

    RDD、DataFrame和DataSet的區(qū)別

    spark 2.X開始,三者的關(guān)系發(fā)生了變化损离,可以參考《且談Apache Spark的API三劍客:RDD、DataFrame和Dataset》 ,在2.X中DataFram...

  • 我有個疑問:
    官網(wǎng)原文
    A DataFrame is a Dataset organized into named columns. It is conceptually equivalent to a table in a relational database or a data frame in R/Python, but with richer optimizations under the hood. DataFrames can be constructed from a wide array of sources such as: structured data files, tables in Hive, external databases, or existing RDDs. The DataFrame API is available in Scala, Java, Python, and R. In Scala and Java, a DataFrame is represented by a Dataset of Rows. In the Scala API, DataFrame is simply a type alias of Dataset[Row]. While, in Java API, users need to use Dataset<Row> to represent a DataFrame.
    其中兩句:
    DataFrame is represented by a Dataset of Rows
    A DataFrame is a Dataset organized into named columns
    意思是不是DataFrame是DataSet的子集绝编,而不是DataSet是DataFrame的特例僻澎?

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