Recent questions tagged scala

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scala - How to filter duplicate records having multiple key in Spark Dataframe?

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - Need to convert a Seq[Option[A]] to Option[Seq[A]]

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - Deriving nested shapeless lenses using only a type

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - Spark MLib Word2Vec Error: The vocabulary size should be > 0

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - How to transform a Seq[Try] to a Try[Seq]

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - How risky is it to call Await.result on db calls

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - "./sbt/sbt assembly" errors "Not a valid command: assembly" for Apache Spark project

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - SBT before/after hooks for a task

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.6k views

scala - How to access Spark RDD Array of elements based on index

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 961 views

scala - What is return type of `if` statement

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - Disambiguate constructor parameter with same name as class field of superclass

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - Read data from Cassandra for processing in Flink

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.3k views

scala - Spark not working with pureconfig

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 924 views

scala - Akka: "Trying to deserialize a serialized ActorRef without an ActorSystem in scope" error

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 984 views

scala - Apache Spark's RDD splitting according to the particular size

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - Proper way to make a Spark Fat Jar using SBT

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.1k views

scala - publish jar files with sbt (3rd party)

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.2k views

scala - How to create a Schema file in Spark

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 951 views

scala - Practical use of futures? Ie, how to kill them?

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 982 views

scala - SBT Assembly - Deduplicate error & Exclude error

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.2k views

scala - Play Slick: How to inject DbConfigProvider in tests

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.0k views

scala - Function literal with multiple implicit arguments

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 977 views

scala - How to test a Try[T] with ScalaTest correctly?

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.2k views

scala - Error initializing SparkContext: A master URL must be set in your configuration

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.2k views

scala - Using JUnit @Rule with ScalaTest (e.g. TemporaryFolder)

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.0k views

scala - Inconsistent behaviour for xs.sliding(n) if n is less than size?

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.3k views

scala - How to escape column names with hyphen in Spark SQL

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 959 views

scala - Apache Flink: ProcessWindowFunction KeyBy() multiple values

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 938 views

scala - Spark Shell Add Multiple Drivers/Jars to Classpath using spark-defaults.conf

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 883 views

scala - Unnecessary recompilations by SBT

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 947 views

scala - How to replace empty values in a column of DataFrame?

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 953 views

scala - Using ReduceByKey to group list of values

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 920 views

scala - Why does RDD.foreach fail with "SparkException: This RDD lacks a SparkContext"?

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 896 views

scala - problem with implicit ambiguity between my method and conforms in Predef

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer 1.1k views

scala - How to order execution of tests in sbt?

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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