July 2017
Intermediate to advanced
796 pages
18h 55m
English
Content preview from Scala and Spark for Big Data Analytics
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Left anti join
Left anti join results in rows from only statesPopulationDF if, and only if, there is NO corresponding row in statesTaxRatesDF.
Join the two datasets by the State column as follows:
val joinDF = statesPopulationDF.join(statesTaxRatesDF, statesPopulationDF("State") === statesTaxRatesDF("State"), "leftanti")%sqlval joinDF = spark.sql("SELECT * FROM statesPopulationDF LEFT ANTI JOIN statesTaxRatesDF ON statesPopulationDF.State = statesTaxRatesDF.State")scala> joinDF.countres22: Long = 28scala> joinDF.show(5)+--------+----+----------+| State|Year|Population|+--------+----+----------+| Alaska|2010| 714031||Delaware|2010| 899816| ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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