Recent questions tagged scala

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scala - flatMap with Shapeless yield FlatMapper not found

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

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scala - Parametric type + function requires a string as second parameter?

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scala - How to hide scrollbars in the JavaFX WebView

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scala - Spark join produces wrong results

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scala reflection

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scala - Error when trying to write to hdfs: Server IPC version 9 cannot communicate with client version 4

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scala - Add additional directory to clean task in SBT build

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scala - Why can't i define a variable recursively in a code block?

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scala - Spark DataFrame equivalent to Pandas Dataframe `.iloc()` method?

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

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1 answer 677 views

scala - Difference in flattening an Option[List[Int]] in 2.9.1 and 2.10 nightly

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

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scala - sbt-assembly : including test classes

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

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scala - How to concatenate two streams in Apache Flink

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scala - Non-integer ids in Spark MLlib ALS

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

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scala - How to create encoder for Option type constructor, e.g. Option[Int]?

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

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scala - Why can I not flatMap a List[Option] using underscore?

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

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scala - Spark Dataset aggregation similar to RDD aggregate(zero)(accum, combiner)

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1 answer 719 views

scala - Cross-compiling aggregate projects with different crossScalaVersions for subprojects

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

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1 answer 736 views

scala - NullPointerException in Spark RDD map when submitted as a spark job

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

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scala - Predict Class Probabilities in Spark RandomForestClassifier

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

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1 answer 839 views

scala - How to convert List[Double] to Columns?

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

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1 answer 735 views

scala - Load Spark data locally Incomplete HDFS URI

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

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1 answer 939 views

scala - Gatling - execute scenarios sequentialy

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

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1 answer 1.0k views

scala - Play tests with database: "Too many connections"

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

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scala - Can I overload curried methods?

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

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scala - Read specific column from Parquet without using Spark

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

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1 answer 874 views

scala - Using dynamic Datasource with Tomcat

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

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1 answer 697 views

scala - What does Dotty offer to replace type projections?

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

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1 answer 895 views

scala - Unresolved Dependencies when building play 2.0 project

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

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1 answer 510 views

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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1 answer 471 views

scala - Load Dataset from Dynamically generated Case Class

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

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1 answer 465 views

scala - Why does implement abstract method using val and call from superclass in val expression return NullPointerException

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

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1 answer 524 views

scala - Is there a native grouping function that works like the sortWith function?

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

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1 answer 781 views

scala - udf No TypeTag available for type string

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

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1 answer 501 views

scala - filter and report multiple predicates

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

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1 answer 686 views

scala - How to let Spark parse a JSON-escaped String field as a JSON Object to infer the proper structure in DataFrames?

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

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