Recent questions tagged scala

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scala - Coalesce duplicate columns in spark dataframe

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

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scala - How to model an entity with many children in Sorm?

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

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scala - How to read a file from HDFS in map() quickly with Spark

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

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scala - Coalesce duplicate columns in spark dataframe

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

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scala - How do you stop building an Option[Collection] upon reaching the first None?

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

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scala - Spark Dataset : Example : Unable to generate an encoder issue

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scala - Some questions about difference between call-by-name and 0-arity functions

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

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scala - Write and read raw byte arrays in Spark - using Sequence File SequenceFile

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

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scala - Managing imports in Scalaz7

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

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1 answer 1.1k views

scala - Why can't _ be used inside of string interpolation?

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

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scala - How to clone an iterator?

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scala - How make implicit Ordered on java.time.LocalDate

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scala - Replace groupByKey() with reduceByKey()

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

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scala - How to find exact median for grouped data in Spark

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

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scala - Map from Class[T] to T without casting

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scala - org.apache.spark.SparkException: Task not serializable

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

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1 answer 968 views

scala - Companion class requires import of Companion object methods and nested objects?

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

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scala - How does the NotNull trait work in 2.8 and does anyone actually use it?

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

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1 answer 917 views

scala - Extract label values from a LabelledGeneric instance

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

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1 answer 882 views

scala - Is it possible to install a callback after request processing is finished in Spray?

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 read parquet files using `ssc.fileStream()`? What are the types passed to `ssc.fileStream()`?

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

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1 answer 1.2k views

scala - Akka: actor current mailbox size or number of messages awaiting processing

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

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1 answer 1.0k views

scala - Convert a List into an Option if it is populated

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

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1 answer 1.0k views

scala - DataFrame explode list of JSON objects

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

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1 answer 959 views

scala - Adding a nested column to Spark DataFrame

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

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1 answer 1.3k views

scala - Customer Type Mapper for Slick SQL

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

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1 answer 960 views

scala - Is the PartialFunction design inefficient?

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

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1 answer 901 views

scala - Splitting string into groups

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

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1 answer 1.3k views

scala - Map flatten and flatmap not equivalent

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

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1 answer 1.2k views

scala - Does Spark maintain parquet partitioning on read?

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

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1 answer 1.2k views

scala - Converting a tuple of options to an option of tuple with Scalaz or Shapeless

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

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1 answer 1.1k views

scala - What is the idiomatic way to pattern match sequence comprehensions?

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

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1 answer 906 views

scala - 1 :: List[Nothing] in foldLeft

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

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scala - Insert a new element in a specified position of a list

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

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1 answer 1.5k views

scala - Map[String,Any] to compact json string using json4s

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

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