Recent questions tagged scala

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scala - Creating a method which returns one or two parameters generically

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

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scala - Why do I get conflicting cross-version in sbt on one environment but not another?

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

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scala - Explode multiple columns in Spark SQL table

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

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scala - How to stop gracefully the actor system for an akka-http server that must be deployed.

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

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scala - Spark decimal type precision loss

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

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scala - Creating/accessing dataframe inside the transformation of another dataframe

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

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scala - How to apply a function to a column of a Spark DataFrame?

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scala - UNRESOLVED DEPENDENCIES installing Deadbolt on Play Framework 2.2.1

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

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scala - Test if implicit conversion is available

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

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scala - How to convert keys in a Map to lower case?

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

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scala - How to pattern-match against every numeric class in one case?

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scala - joda DateTime format cause null pointer error in spark RDD functions

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

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scala sbt assembly "no main manifest attribute"

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

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scala - Is there a way to test at compile-time that a constant is a compile-time constant?

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

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scala - strange error message: bad symbolic reference. A signature in package.class refers to term apache in package org which is not available

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

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scala - Handling Doubles in ScalaTest

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

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scala - why doesn't null.asInstanceOf[Int] throw a NullPointerException?

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

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scala - Why wrapping a generic method call with Option defers ClassCastException?

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

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scala - Play 2 - Set header on all responses?

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

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1 answer 877 views

scala - NLineInputFormat not working in Spark

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

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scala - How does spray.routing.HttpService dispatch requests?

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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1 answer 859 views

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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1 answer 888 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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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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1 answer 1.1k views

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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1 answer 915 views

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

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

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1 answer 921 views

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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