Recent questions tagged scala

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scala - spark apply function to columns in parallel

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

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scala - How to create a wrapper of List with a specific type

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scala - Spark sample is too slow

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scala - Type inference with existential type

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scala - Spark: broadcasting jackson ObjectMapper

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

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scala - How to eval code that uses InterfaceStability annotation (that fails with "illegal cyclic reference involving class InterfaceStability")?

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scala - Call Solr asynchronous from Play Framework

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scala - How to create a schema from CSV file and persist/save that schema to a file?

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

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scala - Why Apache Spark take function not parallel?

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

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scala - String interpolation, escaping quotation mark

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

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scala - Mockito's mock throw ClassNotFoundException in Spark application

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scala - RDD to LabeledPoint conversion

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scala - Spark broadcast error: exceeds spark.akka.frameSize Consider using broadcast

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

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scala - Using Tuples in map, flatmap,... partial functions

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

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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

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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?

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

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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?

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

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1 answer 998 views

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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1 answer 1.1k views

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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1 answer 971 views

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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scala - NLineInputFormat not working in Spark

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

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1 answer 906 views

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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