Recent questions tagged scala

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scala - how to filter out a null value from spark dataframe

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

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scala - How to set heap size for sbt?

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

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scala - How to write unit tests in Spark 2.0+?

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scala - How to create SBT project with IntelliJ Idea?

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

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scala - @karate How to pass parameter to a feature file in gatling simulation class?

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

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scala - Apache Spark how to append new column from list/array to Spark dataframe

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scala - How to get ClassTag form TypeTag, or both at same time?

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scala - Why doesn't Array's == function return true for Array(1,2) == Array(1,2)?

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

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scala - Why can't I return a concrete subtype of A if a generic subtype of A is declared as return parameter?

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

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scala - call of distinct and map together throws NPE in spark library

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

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scala - How do I make a function involving futures tail recursive?

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scala - Explanation of fold method of spark RDD

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

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scala - How to get path to the uploaded file

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

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scala - What are the rules to govern underscore to define anonymous function?

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

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scala - Result type of an implicit conversion must be more specific than AnyRef

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scala - No Json serializer as JsObject found for type play.api.libs.json.JsObject

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

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scala - Is there a way to control which implicit conversion will be the default used?

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

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1 answer 904 views

scala - What is going wrong with `unionAll` of Spark `DataFrame`?

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

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1 answer 859 views

scala - Run custom task automatically before/after standard task

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

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scala - How to convert unix timestamp to date in Spark

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

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1 answer 1.3k views

scala - Cartesian product of two lists

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

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1 answer 1.3k views

scala - How to use Column.isin with list?

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

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scala - Better way to convert a string field into timestamp in Spark

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

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1 answer 891 views

scala - Syntax sugar: _* for treating Seq as method parameters

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

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1 answer 720 views

scala - Stackoverflow due to long RDD Lineage

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

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1 answer 821 views

scala - java.io.IOException: Could not locate executable nullinwinutils.exe in the Hadoop binaries. spark Eclipse on windows 7

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

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1 answer 888 views

scala - how do I get sbt to use a local maven proxy repository (Nexus)?

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

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1 answer 973 views

scala - Shuffle a list of integers with Java 8 Streams API

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

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1 answer 323 views

scala - Customize SparkContext using sparkConf.set(..) when using spark-shell

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

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1 answer 488 views

scala - How to define a custom aggregation function to sum a column of Vectors?

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

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1 answer 310 views

scala - Setting up sbt to use Java 7 for compilation?

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

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1 answer 488 views

scala - how to convert json string to dataframe on spark

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

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1 answer 320 views

scala - DataFrame-ified zipWithIndex

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

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scala - Get field names list from case class

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

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1 answer 287 views

scala - Spark: what's the best strategy for joining a 2-tuple-key RDD with single-key RDD?

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

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