logo
down
shadow

SCALA QUESTIONS

Cannot find x path from request in wiremock
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
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
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
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
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?
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?
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
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
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
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
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?
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
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
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
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?
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?
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
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
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?
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
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
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
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?
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
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
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)
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
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
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
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
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?
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
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
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?
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
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...?
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
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?
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?
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
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?
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
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
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?
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?
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?
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
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?
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)
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
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?
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?
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?
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?
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
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
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
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
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
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

shadow
Privacy Policy - Terms - Contact Us © festivalmusicasacra.org