Recent questions tagged scala

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

scala - "Unknown artifact. Not resolved or indexed" error for scalatest

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887 views 1 answer

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

scala - Converting nested case classes to nested Maps using Shapeless

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614 views 1 answer

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

scala - Returning original collection type in generic method

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606 views 1 answer

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

scala - Abstract types versus type parameters

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534 views 1 answer

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

scala - How to calculate the best numberOfPartitions for coalesce?

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578 views 1 answer

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

scala - Difference between MutableList and ListBuffer

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632 views 1 answer

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

scala - Merge maps by key

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768 views 1 answer

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

scala - Can't prove that singleton types are singleton types while generating type class instance

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618 views 1 answer

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

scala - Insert if not exists in Slick 3.0.0

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899 views 1 answer

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

scala - Reading JSON with Apache Spark - `corrupt_record`

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854 views 1 answer

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

scala class constructor parameters

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745 views 1 answer

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

scala - Reading DataFrame from partitioned parquet file

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864 views 1 answer

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

scala - Why is parameter in contravariant position?

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649 views 1 answer

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

scala - Filter spark DataFrame on string contains

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753 views 1 answer

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

scala - Why is Function[-A1,...,+B] not about allowing any supertypes as parameters?

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602 views 1 answer

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

scala - SBT stop run without exiting

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738 views 1 answer

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

scala - Spark - Error "A master URL must be set in your configuration" when submitting an app

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765 views 1 answer

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

scala - How to sort by column in descending order in Spark SQL?

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580 views 1 answer

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

scala - Why does join fail with "java.util.concurrent.TimeoutException: Futures timed out after [300 seconds]"?

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633 views 1 answer

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

scala - Any vs underscore in generics

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504 views 1 answer

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

scala - Easy idiomatic way to define Ordering for a simple case class

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562 views 1 answer

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

scala - Are HLists nothing more than a convoluted way of writing tuples?

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444 views 1 answer

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

scala - Is there a reason not to use SparkContext.getOrCreate when writing a spark job?

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531 views 1 answer

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

scala - Play: How to implement action composition

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628 views 1 answer

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

scala - Spark DataFrames when udf functions do not accept large enough input variables

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696 views 1 answer

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

scala - How to pattern match into an uppercase variable?

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654 views 1 answer

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

scala - Cake pattern with overriding abstract type don't work with Upper Type Bounds

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615 views 1 answer

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

scala - Spark Row to JSON

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881 views 1 answer

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