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The Dataframe API was released as an abstraction on top of the RDD, followed by the Dataset API. In Spark 1.x, the RDD was the primary application programming interface (API), but as of Spark 2.x use of the Dataset API is encouraged [3] even though the RDD API is not deprecated. [4] [5] The RDD technology still underlies the Dataset API. [6] [7]
[4]: 114 A DataFrame is a 2-dimensional data structure of rows and columns, similar to a spreadsheet, and analogous to a Python dictionary mapping column names (keys) to Series (values), with each Series sharing an index. [4]: 115 DataFrames can be concatenated together or "merged" on columns or indices in a manner similar to joins in SQL.
Reading and searching the first (and only) block of the aux-aux index which is the root of the tree identifies the relevant block in aux-index in the level below. Reading and searching that aux-index block identifies the relevant block to read, until the final level, known as the leaf level, identifies a record in the main database.
In software development, Make is a command-line interface software tool that performs actions ordered by configured dependencies as defined in a configuration file called a makefile.
In computer science and statistics, the Jaro–Winkler similarity is a string metric measuring an edit distance between two sequences. It is a variant of the Jaro distance metric [1] (1989, Matthew A. Jaro) proposed in 1990 by William E. Winkler.
The Kurt J. Hilzinger Stock Index From January 2008 to December 2012, if you bought shares in companies when Kurt J. Hilzinger joined the board, and sold them when he left, you would have a -10.3 percent return on your investment, compared to a -2.8 percent return from the S&P 500.
The Anne M. Finucane Stock Index From January 2011 to December 2012, if you bought shares in companies when Anne M. Finucane joined the board, and sold them when she left, you would have a 37.9 percent return on your investment, compared to a 12.1 percent return from the S&P 500.
In 1997, Abramson published a book, The Defense Is Ready: Life in the Trenches of Criminal Law. [1] In 2004, she was hired by Phil Spector, who was charged with fatally shooting actress Lana Clarkson at his suburban Alhambra, California mansion, replacing his former attorney, Robert Shapiro. [11]