A DataFrame is an immutable distributed collection of data like an RDD, but unlike an RDD, data is organized into named columns of a table in a relational database. This makes processing easier by imposing a structure onto a distributed…
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In 1999, I pivoted from mechanical engineering to become a self-taught Java expert. Over the past 19+ years, I have built a high-demand contracting career, delivering mission-critical solutions for 13+ top-tier organisations. With a proven track record that has generated over 130+ job offers, I help enterprises solve complex data challenges at scale.
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Author of the book "Java/J2EE job interview companion", which sold 35,000+ copies on amazon.com & superseded by this site with 2000+ registered users.
Amazon.com profile | LinkedIn | LinkedIn Group | YouTube
Email: java-interview@hotmail.com
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