Recent questions tagged scala

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Function returns an empty List in Spark

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729 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Spark: produce RDD[(X, X)] of all possible combinations from RDD[X]

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692 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Why are singleton objects more object-oriented?

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619 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Spark DataFrame: does groupBy after orderBy maintain that order?

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676 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - How to save a spark DataFrame as csv on disk?

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750 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Play 2.4: Form: could not find implicit value for parameter messages: play.api.i18n.Messages

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737 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - How to turn json to case class when case class has only one field

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654 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Defaults for missing properties in play 2 JSON formats

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592 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Spark: Add column to dataframe conditionally

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669 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - How to create a Source that can receive elements later via a method call?

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594 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Why are `private val` and `private final val` different?

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710 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Memory barriers and coding style over a Java VM

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502 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - How to write spark streaming DF to Kafka topic

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545 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - How do you do dependency injection with the Cake pattern without hardcoding?

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533 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Stream vs Views vs Iterators

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810 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - How to use COGROUP for large datasets

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645 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - How to get ID of a map task in Spark?

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1.0k views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - By-name parameter vs anonymous function

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649 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Type mismatch on abstract type used in pattern matching

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761 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Filling gaps in timeseries Spark

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706 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - If an Int can't be null, what does null.asInstanceOf[Int] mean?

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656 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - java.lang.NoClassDefFoundError: org/apache/spark/streaming/twitter/TwitterUtils$ while running TwitterPopularTags

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526 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Weird behavior trying to convert case classes to heterogeneous lists recursively with Shapeless

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495 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - withFilter instead of filter

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720 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Mixing in a trait dynamically

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832 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - How to find spark RDD/Dataframe size?

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1.1k views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - Change nullable property of column in spark dataframe

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748 views 1 answer

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

scala - How to add "provided" dependencies back to run/test tasks' classpath?

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468 views 1 answer

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