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Datasets are a strictly Java Virtual Machine (JVM) language feature that work only with Scala and Java. Using Datasets, you can define the object that 阅读全文
posted @ 2019-02-23 14:51
DataNerd
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What Is SQL? Big Data and SQL: Apache Hive Big Data and SQL: Spark SQL The power of Spark SQL derives from several key facts: SQL analysts can now tak 阅读全文
posted @ 2019-02-23 11:05
DataNerd
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Spark Core DataSource: CSV JSON Parquet ORC JDBC/ODBC connections Plain text files The Structure of the Data Sources API Read API Structure The core s 阅读全文
posted @ 2019-02-23 09:58
DataNerd
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