Recent questions tagged scala

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

scala - How to pre-package external libraries when using Spark on a Mesos cluster

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549 views 1 answer

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

scala - How to change the column type from String to Date in DataFrames?

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691 views 1 answer

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

scala - Logging options for Slick

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726 views 1 answer

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

scala - covariant type T occurs in contravariant position

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740 views 1 answer

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

scala - What is the difference between Try and Either?

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719 views 1 answer

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

scala - abstract type pattern is unchecked since it is eliminated by erasure

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933 views 1 answer

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

scala - Re-run with -feature for details

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1.0k views 1 answer

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

scala - Add new column in DataFrame base on existing column

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737 views 1 answer

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

scala - Slick: query multiple tables/databases with getting column names

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983 views 1 answer

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

scala - List files on S3

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822 views 1 answer

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

scala - Setting up sbt environment to hack on multiple libraries at once

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593 views 1 answer

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

scala - converting Akka's Future[A] to Future[Either[Exception,A]]

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694 views 1 answer

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

scala - Mock Objects in Play[2.0]

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664 views 1 answer

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

scala - Spark runs out of memory when grouping by key

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642 views 1 answer

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

scala - How do I convert a WrappedArray column in spark dataframe to Strings?

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1.8k views 1 answer

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

scala - how to use Regexp_replace in spark

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965 views 1 answer

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

scala - How to uncache RDD?

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702 views 1 answer

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

scala - GSON JsonObject "Unsupported Operation Exception: null" getAsString

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735 views 1 answer

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

scala - RestAPI service call from Spark Streaming

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758 views 1 answer

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

scala - Spark - Sum of row values

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909 views 1 answer

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

scala - How to profile the time spent for a task in SBT

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838 views 1 answer

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

scala - How to make tree mapping tail-recursive?

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676 views 1 answer

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

scala - How to catch slick postgres exceptions for duplicate key value violations

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866 views 1 answer

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

scala - Why does Seq.contains accept type Any rather than the type parameter A?

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712 views 1 answer

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

scala - Spark Streaming mapWithState seems to rebuild complete state periodically

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572 views 1 answer

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

scala - Is it possible to override a type field?

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695 views 1 answer

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

scala - When to use Option

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585 views 1 answer

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

scala - Difference between sc.broadcast and broadcast function in spark sql

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748 views 1 answer

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