SCALA QUESTIONS

Cannot find x path from request in wiremock

hop of those help? Age element is under the http://abc.example.com/b namespace URI. From Wiremock documentation you can declare the in scope namespace for your XPath expression like this:

TAG : scala

Date : January 11 2021, 05:14 PM , By : user3099933

Does the Scala compiler try to reduce object creation between several sequential maps and flatmaps

like below fixes the issue It doesn't matter how smart the compiler is, it must still conform to what the language specifies.In this case the language says that each map/flatMap operation must appear to complete before the next one starts. So the com

TAG : scala

Date : January 11 2021, 03:34 PM , By : Anthony

Scala ignore generic type

will be helpful for those in need In short you cant do this way. When wildcard is involved, the type parameter of an expression is always different from others, even they come from the same variable. The type A body.content and the type parameter A o

TAG : scala

Date : January 11 2021, 03:26 PM , By : user3099057

Equivalent to balancer, broadcast and merge in pure akka streams

I wish did fix the issue. Use Source.combine and Sink.combine. From the documentation:

TAG : scala

Date : January 10 2021, 02:06 PM , By : user3098233

Using a defined value in a filter function concerning a DataFrame in Scala Spark

will be helpful for those in need you don't need to use take in the intermediate steps (this wont scale), use a join instead:

TAG : scala

Date : January 10 2021, 02:06 PM , By : Edain

what does def * (def asterisk) mean?

will help you It's the name of an abstract method in Slick's Table, used to tell Slick how it should convert those columns into a Scala object, and the Scala object back into the database columns. The complete code in your question would be

TAG : scala

Date : January 10 2021, 02:04 PM , By : user3097984

How do Scala macro typechecks resolve identifiers to types?

I wish did fix the issue. I'm trying to create an annotation macro which can only be applied to a certain type. When I run my tests I see a type not found error when the annotation is applied to top level objects only. , Try

TAG : scala

Date : January 09 2021, 05:38 AM , By : LogCat

How to solve SBT Dependency Problem with Spark and whisklabs/docker-it-scala

help you fix your problem I tried two approaches1. Approach: Shading the dependency in the xxxxxxx project

TAG : scala

Date : January 08 2021, 10:52 AM , By : djimi

flatMap results when read from a file is different from same line passed as a string

I wish this help you I have just started learning spark and scala. I have a file test.txt which has one line "My name is xyz". , This is using sc and so is parallized in Spark.

TAG : scala

Date : January 08 2021, 03:18 AM , By : user3097103

Merging n CSV strings ignoring headers from every string except the first one

Does that help IMHO from a performance standpoint, it is highly beneficial to eliminate the headers of each individual csv file and then merging them together. To eliminate the header you can delete the first element of the list which happens in O(1)

TAG : scala

Date : January 07 2021, 03:08 PM , By : user3096813

Proper way to maintain an SSE connection in Play

This might help you Periodically send an empty Event to keep the connection alive:

TAG : scala

Date : January 07 2021, 03:08 PM , By : user3096794

How to pass a case class into a function parameter and get a schema accordingly?

around this issue the function which will return me the schemaI made a function called getschema(MyCaseClass) which will return me the schema by encoding using Encoders.product[MyCaseClass].schema but Encoders.product is not taking that case class as

TAG : scala

Date : January 07 2021, 03:08 PM , By : user3096671

List[Try[T]] to Try[List[T]] in Scala

Hope this helps I would like to know how to convert a List[Try[T]] to Try[List[T]] in Scala? , Using cats it's as easy as:

TAG : scala

Date : January 06 2021, 03:27 AM , By : louiss15

How to loop over array and concat elements into one print statement or variable Spark Scala

will help you Here is my suggested solution. I don't have the rest of your codebase, so there is no way for me to test it on my own machine, but here is my best attempt:

TAG : scala

Date : January 03 2021, 08:18 AM , By : Stephsanola

Type classes vs Data Types in functional Libraries in scala such as Cats and ScalaZ

like below fixes the issue I would say it's mostly Haskell influence: everything that you would declare as class in Haskell is called "type class", and is usually located in cats._ everything that you would declare as data in Haskell is called "data

TAG : scala

Date : January 02 2021, 06:48 AM , By : Maji Yazuka

How can I group (in Scala) rows of a dataframe and can I sum values of a column of this rows?

wish help you to fix your issue Here you can use window functions to define your groups.To define if it is a new group, we need to check if the previous value of seconds is between 9 and 11.

TAG : scala

Date : January 02 2021, 06:48 AM , By : Esben Østergaard

Where does this .get(x) behavior come from?

will be helpful for those in need , It is StringOps.apply from implicit conversion

TAG : scala

Date : January 02 2021, 06:48 AM , By : Ashish Agarwal

case class - combine pattern match

Hope that helps There are several issue with what you tried: You are using the || (Or operator) instead of the | (Pipe operator) to represent multiple case, as @Luis commented - see this question You are to try to reference a variable when multiple c

TAG : scala

Date : January 02 2021, 06:48 AM , By : user6037666

Define function that flips its arguments

To fix the issue you can do It depends on what you mean by flip.Flip as in "change the value of two variables"

TAG : scala

Date : January 02 2021, 06:48 AM , By : Shikha Gupta

DDD functional way: Why is it better to decouple state from the behavior when applying DDD with functional language?

I wish did fix the issue. One advantage might be being able to add another link to the chain without having to modify and recompile domain model. For example, say we wanted to add another validation step to check for fraud

TAG : scala

Date : January 02 2021, 06:48 AM , By : anuo

Getting error while running Scala Spark code to list blobs in storage

I hope this helps you . This is happening because Spark uses older version of Guava library than google-cloud-storage library that doesn't have Preconditions.checkArgument method. This leads to java.lang.NoSuchMethodError exception.You can find more

TAG : scala

Date : January 02 2021, 06:48 AM , By : 张选彬

Running a function that returns Try asynchronously

like below fixes the issue Consider making the meaning of get more explicit by folding Try like so

TAG : scala

Date : January 02 2021, 06:48 AM , By : mitz

Gen.sequence ignores size of given Traversable

may help you . This might be due to Test Case Minimisation

TAG : scala

Date : January 02 2021, 06:48 AM , By : Mr.zhao

how to print the index of failure in catch expression in scala?

seems to work fine I have a code looking like this: , You can do this instead using Cats:

TAG : scala

Date : January 02 2021, 06:48 AM , By : Matiajelo

Scala Pattern type is incompatible with expected type

seems to work fine Lets start by scratch, that should help you grasp the concepts.We will create our own simple functional List.

TAG : scala

Date : January 02 2021, 06:48 AM , By : vikszn

Find the top N numbers in an endless stream of integers in a functional programming style

may help you . I came across this interesting Scala problem and not sure how to solve it: , If you have a function topNSoFar:

TAG : scala

Date : January 02 2021, 06:48 AM , By : Brad Roberts

Writing file using FileSystem to S3 (Scala)

To fix this issue you need to ask for the specific filesystem for that scheme, then you can create a text file directly on the remote system.

TAG : scala

Date : January 02 2021, 06:48 AM , By : jalal

How to change date from yyyy-mm-dd to dd-mm-yyy using Spark function

To fix the issue you can do I'm working on Apache spark project on eclipse using Scala , Can be done with regex.

TAG : scala

Date : January 02 2021, 06:48 AM , By : Kormakov N.

Filtering Dataframe by nested array

Does that help See if this helps. solution is to flatten the inner arrays and use org.apache.spark.sql.functions.array_contains function to filter.If you are using spark 2.4+ you may use higher order function org.apache.spark.sql.functions.flatten in

TAG : scala

Date : January 02 2021, 06:48 AM , By : John

How do I access a nested function in a scala object

I hope this helps you . You can consider func2 to be the equivalent of a nested variable. You aren't able to access this outside of its parent function. Try changing a few things around to make this example more obvious:

TAG : scala

Date : January 02 2021, 06:48 AM , By : R Mtnez

Execute operation on Future's value for its side effects, discarding result and retaining original value, but retaining

wish of those help Try Future.andThen for side-effects

TAG : scala

Date : January 02 2021, 06:48 AM , By : Muhammad Arifudin

Skewed Window Function & Hive Source Partitions?

hope this fix your issue Hive based solution :You can enable Skew join optimization using hive configuration. Applicable settings are:

TAG : scala

Date : January 02 2021, 06:48 AM , By : Ismail Issa

using the object in the match clause of pattern match in Scala

Hope that helps I have code like this:

TAG : scala

Date : January 02 2021, 06:48 AM , By : Destalem Haylay

How to execute list of scala futures sequentially

hop of those help? I want to execute List of functions which returns futures sequentially. , Try creating a pool with one thread and use Future.traverse like so

TAG : scala

Date : January 02 2021, 06:48 AM , By : ones

is there a way to modify the sbt version of an existing project in IntelliJ IDEA?

it should still fix some issue I am learning this course. , Try changing version in yourproject/project/build.properties

TAG : scala

Date : January 02 2021, 06:48 AM , By : Matthieu Fereyre

Is it possible to make a generic function that takes different case classes

like below fixes the issue Here is an example using shapeless lenses as per Harald Gliebe's and Thilo's suggestion:

TAG : scala

Date : January 02 2021, 06:48 AM , By : Santiago Corleone

How do I implement a function that generates natural numbers 1,3,5,7...?

Hope this helps How do I implement a function that generates infinite odd natural numbers 1,3,5,7...? , you can use Stream.from(from: Int, step: Int) :

TAG : scala

Date : January 02 2021, 06:48 AM , By : luomin

how to implement flatten for stream using flatmap

I wish did fix the issue. How do I implement flatten for Stream using flatmap? For function to preserve content of input stream, but simplifies its structure into a single stream? , You can try:

TAG : scala

Date : January 02 2021, 06:48 AM , By : 李银涛

Akka Streams - How to check if a stream ran successfully?

it fixes the issue runWith returns a future having Sucess or Failure. We can use onComplete callback to extract the value.

TAG : scala

Date : January 02 2021, 06:48 AM , By : Александр Крекс

How can I combine shared tests with fixtures that require cleanup?

this will help Currently, I have a set of shared Scalatest tests that live in a trait and are mixed in to test classes where necessary, like so: , Try

TAG : scala

Date : January 02 2021, 06:48 AM , By : Jusonibond

is it possible (and how) to specify an sql query on command line with spark-submit

To fix the issue you can do Seems that the process is burning part of the query during input. One solution to this problem would be to send the entire argument of you select query in one line and input it into a string value. In that format it can be

TAG : scala

Date : January 02 2021, 06:48 AM , By : Maus

How do I compare tuple values?

wish helps you I just have a quick syntax question and I don't find the answer. I have a tuple, for example (2, 3), and I want to compare those values. For the sake of the question, I boiled it down to one specific case with the problem. , Here's two

TAG : scala

Date : January 02 2021, 06:48 AM , By : Bart Van Miegem

Updating column value in loop in spark

this will help You should use a when function instead of such complicated syntax, also there is no need for an explicit loop, Spark handles it itself. When you perform a withColumn it is applied to each row

TAG : scala

Date : January 02 2021, 06:48 AM , By : THDCO

Parallelism in Cassandra read using Scala

To fix the issue you can do I'd recommend you go with below approaach source Russell Spitzer's BlogManually dividing our partitions using a Union of partial scans : Pushing the task to the end-user is also a possibility (and the current workaround.)

TAG : scala

Date : January 02 2021, 06:48 AM , By : Mostafa Mirzapour

How to create my own custom scalafmt style that my projects can depend on?

I hope this helps . Consider defining a custom task to download .scalafmt.conf from remote repository

TAG : scala

Date : January 02 2021, 06:48 AM , By : 陈晓琦

how to sort each line on the file in scala?

I wish this helpful for you I want sorted list of the names, last name first, one per line. Names will be ordered by the number of characters in the first name in ascending order, shortest first. Within each group of names of each length, they will b

TAG : scala

Date : January 02 2021, 06:48 AM , By : Masud rana Mamun

Iterate boolean comparison over two DataFrames?

I hope this helps . I have created two DF sets, one with a generic number list and another with a specific number list. I want to iterate over the first list and compare it to the second list; if GenericList[X] is equal to any number in SpecificNumbe

TAG : scala

Date : January 02 2021, 06:48 AM , By : beePEA

Eliminating identity wrapper types from Scala APIs

hop of those help? Suppose I am trying to "abstract over execution": , This more of long comment rather than an answer...

TAG : scala

Date : January 02 2021, 06:48 AM , By : Sumit Kumar

When running scala code in spark I get "Task not serializable" , why?

help you fix your problem I resolved it, but I'm not entirely sure what was wrong. I deleted the line val sc = SparkContext.getOrCreate() and now it works, maybe it is because some "spark context" already are running, when I'm starting the clusters u

TAG : scala

Date : January 02 2021, 06:48 AM , By : Alslert

Akka - Best Approach to configure an Actor that consumes a REST API service (blocking operation)

may help you . Using a RESTful API from a web service does not have to be blocking.An easy way to consume a RESTful API from an actor is to use Akka HTTP Client. This allows you to send an HTTP request and have the result sent back as a message to an

TAG : scala

Date : January 02 2021, 06:48 AM , By : JohnnyBoy

how to substring a variable string

around this issue suppose I have a variable , Try this

TAG : scala

Date : January 02 2021, 06:48 AM , By : patated

How to write empty data frame headers only to csv file?

this one helps. You can't do this with Spark 2.x and there is no workaround, so you will have to create the file manually. It will work from 3.0 onwards though. Here is the ticket: https://issues.apache.org/jira/browse/SPARK-26208

TAG : scala

Date : January 02 2021, 06:48 AM , By : Nicolás Améstica Vid

How to sort data in Scala?

it should still fix some issue It looks like you need an Ordering for your java.time.LocalDate - see this answer

TAG : scala

Date : January 02 2021, 06:48 AM , By : mrbluecoat

What (exactly) are "First Class" modules?

fixed the issue. Will look into that further A module, as well as a subroutine, is a way of organizing your code. When we develop programs, we pack instructions into subroutines, subroutines into structures, structures into packages, libraries, assem

TAG : scala

Date : January 02 2021, 06:48 AM , By : Eddie Noureddine

How to divide values of two columns with another name in sqlcontext?

I wish did fix the issue. I have afile callled tagupdate(UserId,MovieId,Tag)and also I have table consists of (MovieId,Tag,occurrence,count) change name of MovieId,Tag,occurrence as eachTagCount ,count as totalcount. I want to divide value of eachTag

TAG : scala

Date : January 02 2021, 06:48 AM , By : Rick

Is it possible to have a generic logging filter in finagle that can be "inserted anywhere" in a chain of andTh

Does that help I couldn't work out a way of defining an automagic logger. My first idea was relying on compiler type inference as per @Krzysztof's suggestion, but that ended up with a type error due to a logger with parameters [Nothing, Nothing] so i

TAG : scala

Date : January 02 2021, 06:48 AM , By : Shewakena Kassa

Split one row into multiple rows of dataframe

help you fix your problem The easiest solution for such a simple schema is to use Dataset.flatMap after defining case classes for the input and output schema.A simple UDF solution would return a sequence and then you can use functions.explode. Far le

TAG : scala

Date : January 02 2021, 06:48 AM , By : T-Mac

Scala Tuple2Zipped vs IterableLike zip

will help you In case it's not obvious, the values and types of v1 and v2 differ: v1 has type List[(Int, Int)] with the value List((1, 5), (2, 6), (3, 7)); v2 has type scala.runtime.Tuple2Zipped[Int, List[Int], Int, List[Int]] and has the value (List

TAG : scala

Date : January 02 2021, 06:48 AM , By : meshiura

How can i check for empty values on spark Dataframe using User defined functions

wish help you to fix your issue UDF which get nullable columns as Row can be used, for get empty column names. Then rows with non-empty columns can be filtered:

TAG : scala

Date : January 02 2021, 06:48 AM , By : Herione

Import Scala object based on value of commandline argument

help you fix your problem Make sure that One and Two share some common interface, choose the instance of this interface at runtime, then import the members of the instance:

TAG : scala

Date : January 02 2021, 06:48 AM , By : Marcos Mauri