scala Questions
2
Solved
Is there an SBT task to increment a project's version?
Given an initial configuration of something like the following build.sbt
name := 'My Project'
organization := 'org.example'
version := '0....
7
Solved
Scala case classes have a limit of 22 fields in the constructor. I want to exceed this limit, is there a way to do it with inheritance or composition that works with case classes?
Brimmer asked 28/11, 2013 at 5:32
7
Solved
I want to something which is similar to the Scala grouped function. Basically, pick 2 elements at a time and process them. Here is a reference for the same:
Split list into multiple lists with fixe...
Feint asked 29/1, 2015 at 9:11
1
It looks like the Scala compiler can't handle enums that implement an interface with a static method that captures the enum type as a method parameter.
Consider the following interface:
//Identif...
2
Solved
Currently learning about Scala 3 implicits but I'm having a hard time grasping what the as and with keywords do in a definition like this:
given listOrdering[A](using ord: Ordering[A]) as Ordering...
4
I am working with following spark config
maxCores = 5
driverMemory=2g
executorMemory=17g
executorInstances=100
Issue:
Out of 100 Executors, My job ends up with only 10 active executors, nonet...
Sindhi asked 20/12, 2017 at 13:51
4
Solved
val columnName=Seq("col1","col2",....."coln");
Is there a way to do dataframe.select operation to get dataframe containing only the column names specified .
I know I can do dataframe.select("col...
Halflife asked 21/3, 2016 at 12:59
5
Solved
I'm working on a homework assignment where we are asked to implement an evaluation strategy called "call by name" in a certain language that we developed (using Scheme).
We were given an example ...
Beardsley asked 3/6, 2010 at 2:34
1
Solved
I asked a question about how to implement a spark dataset with case class inheritance (see Spark Dataset with case class inheritance) and got a helpful reply to use org.typelevel.frameless to injec...
Khano asked 18/4 at 17:27
3
Solved
If I want to store an Algebraic Data Type (ADT) (ie a Scala sealed trait hierarchy) within a Spark DataSet column, what is the best encoding strategy?
For example, if I have an ADT where the leaf ...
Christos asked 8/12, 2016 at 1:3
6
Solved
How can I create a Spark DataFrame in Scala with 100 rows and 3 columns that have random integer values in range (1, 100)?
I know how to create a DataFrame manually, but I cannot automate it:
val...
Loach asked 7/2, 2018 at 8:38
11
Solved
Environment: Play 2.3.0/Scala 2.11.1/IntelliJ 13.1
I used Typesafe Activator 1.2.1 to create a new project with Scala 2.11.1. After the project was created, I ran gen-idea. The generated IDEA proj...
Hydria asked 3/6, 2014 at 16:5
1
Solved
I'd like to be able to store different related types in a Spark DataFrame but work with strongly typed case classes via a DataSet. E.g. say I have a Base trait and two case classes A and B that ext...
Freidafreight asked 15/4 at 21:18
17
Solved
I installed Spark using the AWS EC2 guide and I can launch the program fine using the bin/pyspark script to get to the spark prompt and can also do the Quick Start quide successfully.
However, I c...
Lovettalovich asked 7/8, 2014 at 22:48
3
What these phrases mean:
xs @ _*
ps @ _*
Copied from documentation:
assemblyMergeStrategy in assembly := {
case PathList("javax", "servlet", xs @ _*) => MergeStrategy.firs...
Hawking asked 14/3, 2017 at 13:18
4
When running a new project utilising LeadIQ's play boilerplate, we will run into an UnsatisfiedLinkError in older versions of JNA below version 5.7.0.
I think this is due to incompatible binaries b...
9
Solved
I need to get only field names of case class. I'm not interested in its values.
I thought getClass.getDeclaredFields.map(_.getName) would return a list of field names.
scala> case class User(id...
Lumpen asked 2/7, 2015 at 16:19
3
Let's say I have this:
val myAnon:(Option[String],String)=>String = (a:Option[String],defVal:String) => {
a.getOrElse(defVal)
}
Don't mind what the function does. Is there anyway of makin...
Maneuver asked 31/3, 2010 at 16:9
7
Solved
Basically I need to unzip a .zip file which contains a folder called modeled which in turn contains a number of excel files.
I have had some luck in finding code that was already written (ZipArch...
3
Solved
I need to delete certain data from a delta-lake table before I load it. I am able to delete the data from delta table if it exists but it fails when the table does not exist.
Databricks scala code ...
Hamo asked 6/10, 2020 at 16:39
5
I have another question that is related to the split function.
I am new to Spark/Scala.
below is the sample data frame -
+-------------------+---------+
| VALUES|Delimiter|
+-------------------+--...
Addict asked 14/7, 2021 at 15:41
10
Solved
did anyone succeed to hide a parameter from generated documentation? I found an issue here, but using @ApiParam(access="internal", required=false) before @HeaderParam did not seem to work.
2
I wanted to append a dataframe to another empty dataframe in a loop and finally write to a Location.
My Code -
val myMap = Map(1001 -> "rollNo='12'",1002 -> "rollNo='13'")...
Hereinto asked 23/7, 2020 at 15:4
5
I am trying to perform a load testing with gradle-gattling, below are my build.gradle and my BasicSimulation.scala
plugins {
id "com.github.lkishalmi.gatling" version "3.0.2"
}
repositories {
ma...
Saith asked 30/8, 2019 at 11:16
3
I have a JSON file that contains a JSON Array
test.json
[
{ "Name": "Bob" },
{ "Age": "37" },
{ "DOB": "12/01/1985"}
]
I would like to test each respective element in the JSON array against ...
Littlest asked 5/9, 2018 at 14:27
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