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SCALA QUESTIONS

akka http not handling parameters with dollar signs properly?
akka http not handling parameters with dollar signs properly?
Any of those help There is an issue with your route tree configuration, probably two candidate routes are evaluated and each one produce a MalformedQueryParamRejection for the $top query parameter.
TAG : scala
Date : November 26 2020, 03:01 PM , By : Jerome Bourgeais
what is the use back ticks in scala
what is the use back ticks in scala
help you fix your problem Using back tickets invalid variable name can be valid. You can use scala reserved key words as variable names as well when you use backticks. You can use space separated and even newline separated variables with back ticks a
TAG : scala
Date : November 26 2020, 03:01 PM , By : lida60
Scala. Play: get data and test result
Scala. Play: get data and test result
I hope this helps . Please do check signature for your doQueryIgnoreRowErrors method I would suspect it should be something like:
TAG : scala
Date : November 26 2020, 03:01 PM , By : Viral Media Solution
Can spark-submit with named argument?
Can spark-submit with named argument?
wish of those help you can write your own custom class which parses the input arguments based on the key something like below:
TAG : scala
Date : November 25 2020, 03:01 PM , By : Shuaib Cader
Scala alternative to series of if statements that append to a list?
Scala alternative to series of if statements that append to a list?
With these it helps I have a Seq[String] in Scala, and if the Seq contains certain Strings, I append a relevant message to another list. , If you want to use some scala iterables sugar I would use
TAG : scala
Date : November 25 2020, 03:01 PM , By : Lang Wu
Convert string column to Array
Convert string column to Array
To fix this issue I guess you have a text file with the information provided in the question. I can suggest your two ways : 1) to use dataframe and split and 2) to use rdd and split.1) dataframe way
TAG : scala
Date : November 24 2020, 03:01 PM , By : Haripriya Tiruveedhu
Unable to authenticate OAuth2 with Akka-Http
Unable to authenticate OAuth2 with Akka-Http
Hope this helps This was an error in IntelliJ.The code runs fine but due to some reason IntelliJ Idea shows error all over it.
TAG : scala
Date : November 21 2020, 03:00 PM , By : honorem
Iterate through rows in DataFrame and transform one to many
Iterate through rows in DataFrame and transform one to many
may help you . You can filter matching-conditions dataframes and then finally union all of them.
TAG : scala
Date : November 21 2020, 03:00 PM , By : TonyDS
Spark Scala Delete rows in one RDD based on columns of another RDD
Spark Scala Delete rows in one RDD based on columns of another RDD
Hope that helps I'm very new to scala and spark and not sure how to start.
TAG : scala
Date : November 20 2020, 03:01 PM , By : Grzegorz Tworkowski
SPARK RDD Between logic using scala
SPARK RDD Between logic using scala
With these it helps I want to check a between logic using 2 RDD's. I am not able to figure out how I can do that
TAG : scala
Date : November 20 2020, 03:01 PM , By : ChristosL
Converting a Spark Dataframe to a mutable Map
Converting a Spark Dataframe to a mutable Map
wish helps you This can be broken down into 3 steps, each one already solved on SO: Convert DataFrame to RDD[(String, Int)] Call collectAsMap() on that RDD to get an immutable map Convert that map into a mutable one (e.g. as described here)
TAG : scala
Date : November 20 2020, 03:01 PM , By : Mohamed.Khaled
Run a function in scala with a list as input
Run a function in scala with a list as input
I hope this helps you . Well, first if you want to have method that takes list of strings, then it should look like:
TAG : scala
Date : November 18 2020, 03:01 PM , By : user7454494
Convert arbitrary number of columns to Vector
Convert arbitrary number of columns to Vector
With these it helps This can be done in a simple way using VectorAssembler. The columns that are to be merged into a Vector are used as input, in this case all columns except the first.
TAG : scala
Date : November 18 2020, 03:01 PM , By : Yemen Ali
how to call a method from another method using scala?
how to call a method from another method using scala?
hop of those help? The return type of your methodtocallnextquery function is not what you think it is I suspect. logger.error probably returns Unit (I'm guessing here, but that seems likely). If so the return type of that method is Any, which probabl
TAG : scala
Date : November 18 2020, 03:01 PM , By : PrincessLily
Scala: Traversable foreach definition
Scala: Traversable foreach definition
To fix this issue I suppose foreach method in Traversable trait is defined as follows: , foreach[U](A => U) is a method in the trait Traversable[+A].
TAG : scala
Date : November 18 2020, 03:01 PM , By : N. Cifer
How to handle multiple invalid query params in akka http?
How to handle multiple invalid query params in akka http?
will help you I've raised a feature request for this:https://github.com/akka/akka-http/issues/1490
TAG : scala
Date : November 17 2020, 03:01 PM , By : worldpatentmarketing
Scala error: value $ is not a member of object org.apache.spark.api.java.JavaSparkContext
Scala error: value $ is not a member of object org.apache.spark.api.java.JavaSparkContext
Hope this helps UPDATE: Whether the configuration is valid or not is something you'll have to work on, but this addresses the error you asked about in your original question.Your code is (almost) valid Java, but not valid Scala. Did you mean somethin
TAG : scala
Date : November 17 2020, 03:01 PM , By : FloordAlex
Extract a specific JSON structure from a json string in a Spark Rdd - Scala
Extract a specific JSON structure from a json string in a Spark Rdd - Scala
With these it helps I have a json string such as: , We can read data with JSON structure, for example:
TAG : scala
Date : November 16 2020, 03:01 PM , By : Abanibi
Spark: How do I query an array in a column?
Spark: How do I query an array in a column?
I wish this helpful for you Please I'm new to Spark (Stackoverflow as well). For the following RDD and DataFrame (same data) I want to get the most viewed tags of playlists with over N videos. My issue is that tags are in an array, in addition I don'
TAG : scala
Date : November 16 2020, 03:01 PM , By : Abbas Sani Kuramial_
scala - Functional way to take a string and create a dictionary using specific delimiters
scala - Functional way to take a string and create a dictionary using specific delimiters
Hope that helps For instance if this is the string I have , Like this:
TAG : scala
Date : November 16 2020, 03:01 PM , By : Newbie Power
Spark Scala: convert arbitrary N columns into Map
Spark Scala: convert arbitrary N columns into Map
wish help you to fix your issue First, you have to tranform your DataFrame into one with a schema matching your case class, then you can use .as[MovieRatings] to convert DataFrame into a Dataset[MovieRatings]:
TAG : scala
Date : November 15 2020, 03:01 PM , By : JIVRAJ MERIYA
How to delete file right after processing it with Play Framework
How to delete file right after processing it with Play Framework
this will help You could use watchTermination on the Source to delete the file once the stream has completed. For example:
TAG : scala
Date : November 14 2020, 03:01 PM , By : Md.ismail Hossain
scala: mapping future of tuple
scala: mapping future of tuple
should help you out The difference is this:map is a higher-order function (HOF) that takes a function as its argument. This function - let's call it the mapping function for convenience - itself takes a single argument, which is the value of the comp
TAG : scala
Date : November 13 2020, 03:01 PM , By : Angkor Meas
why does sameElements returns true for sets?
why does sameElements returns true for sets?
wish help you to fix your issue For scala.collection.immutable.Set.sameElements(Set) to return true, both sets need to have the same elements, in the same order.The default Set implementations are not ordered, so the element ordering depends upon the
TAG : scala
Date : November 12 2020, 03:00 PM , By : pooler
Scala: Class of Options to Option of Class
Scala: Class of Options to Option of Class
should help you out There're two small notes, before we jump into implementation. 1) With shapeless, you can convert any case class (or ADT) to its generic representation and back.
TAG : scala
Date : November 12 2020, 03:00 PM , By : hao wanghao
timeout in scala's future firstcompletedof
timeout in scala's future firstcompletedof
I think the issue was by ths following , Your task while (true) {} never completes. It blocks a thread in an execution context forever. So every time you run f, you lose one thread in the execution context until it runs out of threads and you start r
TAG : scala
Date : November 11 2020, 03:01 PM , By : Done
No 'scala-library*.jar' in every new IntelliJ Scala Project
No 'scala-library*.jar' in every new IntelliJ Scala Project
I wish this help you If you are using sbt 1.0.2, this problem might be due to a bug in sbt. A fix is expected for sbt 1.0.3.Related issues:
TAG : scala
Date : November 11 2020, 03:01 PM , By : Ronak Pareek
What is the meaning of "new {}" in Scala?
What is the meaning of "new {}" in Scala?
like below fixes the issue In short, it is creating new instance of Anonymous TypeAccording to the Scala Language Spec:
TAG : scala
Date : November 11 2020, 03:01 PM , By : stein_errrr
Why I cannot use iterator again in Scala
Why I cannot use iterator again in Scala
should help you out Noticed that method hasNext()? That method tells you when "everything was iterated". Why do you expect the method to return true again, after it told you: "you saw all the elements" before? How should the iterator "know" that you
TAG : scala
Date : November 10 2020, 03:01 PM , By : Tsokoko
Spark worker throws FileNotFoundException on temporary shuffle files
Spark worker throws FileNotFoundException on temporary shuffle files
this will help The problem turns out to be a stack overflow (ha!) occurring on the worker.On a hunch, I rewrote the operation to be performed entirely on the driver (effectively disabling Spark functionality). When I ran this code, the system still c
TAG : scala
Date : November 10 2020, 03:01 PM , By : Saurabh Sutrave
Version conflict: some are suspected to be binary incompatible
Version conflict: some are suspected to be binary incompatible
this one helps. It means that you have different dependencies, each utilizing different version of the same library. Namely, circe and fs2 are relying on cats 0.9.0, where pathservice is depending on 1.0.0-MF.Now, due to the way .ivy works, the lates
TAG : scala
Date : November 10 2020, 03:01 PM , By : C947
Sbt: when to use testQuick and how does it determine which tests to skip?
Sbt: when to use testQuick and how does it determine which tests to skip?
around this issue By default its kept in target/streams/test/test/$global/streams/succeded_tests (path may vary depending on build settings) if You are interested how exactly its picking tests to run check testQuickFilter method in: https://github.co
TAG : scala
Date : November 09 2020, 03:01 PM , By : Masoud Harati
IntelliJ: Scala worksheet don't pick up code changes without restart
IntelliJ: Scala worksheet don't pick up code changes without restart
Any of those help This seems to fix it, though I would love to know why the default setting is broken, or what this undocumented setting does: Go to File -> Settings -> Languages Frameworks -> Scala -> Worksheet (tab) . Unselect "Run worksheet in th
TAG : scala
Date : November 08 2020, 03:01 PM , By : Matt N.
The relationship between Type Symbol and Mirror of Scala reflection
The relationship between Type Symbol and Mirror of Scala reflection
this will help When working with the Scala Reflection API you encounter a lot more types that what you're used to if you've used the Java Reflection API. Given an example scenario where you start with a String containing a fully qualified class name
TAG : scala
Date : November 08 2020, 03:01 PM , By : Steve Mecking
Difference between [ ] and ( ) to create new Scala objects
Difference between [ ] and ( ) to create new Scala objects
will be helpful for those in need Props is a case class with a companion object. In Scala code you will see two major ways people will construct objects. One is with a constructor on a class. Another major way is by calling an apply() method on a com
TAG : scala
Date : November 07 2020, 03:01 PM , By : Kopro
Error: Could not find or load main class Main Scala
Error: Could not find or load main class Main Scala
help you fix your problem For me it turns out that the src/main was not marked as Sources Root which causes the following error
TAG : scala
Date : November 06 2020, 03:01 PM , By : Anumeet Nepaul
Maximum value of an mllib Vector?
Maximum value of an mllib Vector?
seems to work fine I've created an ML pipeline with Apache Spark using mllib. The evaluator result is a DataFrame with a column "probability", which is a mllib vector of probabilities (similar to predict_proba in scikit-learn). , Vector doesn't have
TAG : scala
Date : November 05 2020, 03:01 PM , By : Andinet
Scalafx: create lineChart in scala
Scalafx: create lineChart in scala
wish help you to fix your issue I think the problem here is the use of the .delegate conversion at the end of the ObservableBuffer declaration, which changes data into a JavaFX ObservableList.ObservableBuffer (part of ScalaFX) is declared to be equiv
TAG : scala
Date : November 05 2020, 03:01 PM , By : Nishit Patel
Conversion to tuple with by-name parameter
Conversion to tuple with by-name parameter
I wish this help you I would like to create a function with the following signature: , I have two proposals to implement this:
TAG : scala
Date : November 02 2020, 03:01 PM , By : SKo00o
How to convert RDD of JSONs to Dataframe?
How to convert RDD of JSONs to Dataframe?
hope this fix your issue Your json rdd seems to be invalid jsons. You need to convert them to valid jsons as
TAG : scala
Date : October 30 2020, 04:01 PM , By : Vaibhav Adetwar
Spark: display log messages
Spark: display log messages
this will help You set the level of logging for spark classes to WARN, so you're seeing this warning. If you want to filter out all Spark warnings (not really recommended), you can set the level to ERROR in your log4j properties file:
TAG : scala
Date : October 29 2020, 04:01 PM , By : Guilherme Gainsborou
How to bind Slick dependency with Lagom?
How to bind Slick dependency with Lagom?
help you fix your problem So, I have this dependency which is used to create tables and interact with Postgres. Here is a Sample Class: , This is how it is woking:
TAG : scala
Date : October 25 2020, 09:10 AM , By : Corsade
Sorting numeric String in Spark Dataset
Sorting numeric String in Spark Dataset
wish of those help Let's assume that I have the following Dataset: , Use the expression in the orderBy. Check this out:
TAG : scala
Date : October 24 2020, 08:10 AM , By : user2172285
understanding unapply without case class
understanding unapply without case class
help you fix your problem the error tell you, that scala can't see the properties in class Emp. in order to expose them, you need smth like this (more on this in here):
TAG : scala
Date : October 22 2020, 08:10 AM , By : user2172971
Parsing more than 22 fields with Spray Json without nesting case classes
Parsing more than 22 fields with Spray Json without nesting case classes
this one helps. You can implement RootJsonFormat as described here to work around Tupple22 and Function22 limitations. There is no limit of 22 parameters in case classes anymore (with caveats) so you can keep your class structure flat. You don't even
TAG : scala
Date : October 19 2020, 08:10 PM , By : user2173848
Why is Scala returning a ';' expected but ',' found error?
Why is Scala returning a ';' expected but ',' found error?
may help you . @sepp2k pointed out correctly in the comment that if you want to create a tuple, then you need to wrap it around parentheses.
TAG : scala
Date : October 19 2020, 08:10 AM , By : user2174105
Spark reading Avro file
Spark reading Avro file
help you fix your problem Turns out I didn't have to use the databricks jar. I added apache spark avro to my dependencies:
TAG : scala
Date : October 18 2020, 08:10 PM , By : Mrobo Robert
How to refactor similar and repetitive functions in scala
How to refactor similar and repetitive functions in scala
I wish did fix the issue. You haven't provided any relevant information on types X or T, but from your example code it looks like you could do something like this.
TAG : scala
Date : October 18 2020, 08:10 AM , By : Degalem Wondale
Getting ClassCastException while trying to save file in avro format in spark
Getting ClassCastException while trying to save file in avro format in spark
wish helps you Indeed, you have to define an avro schema, or use external librairies such as avro4s, to get it from your case class.Using native Avro:
TAG : scala
Date : October 17 2020, 08:10 AM , By : Jay Hancock
How to Microbenchmark using data from a file?
How to Microbenchmark using data from a file?
it fixes the issue OP here: after several hours, I was finally able to get through the pathetically outdated documentation, what exists anyway, and figure out the following:In addition to my edit above, there are several ways to override execution co
TAG : scala
Date : October 16 2020, 08:10 PM , By : Caroline
Overloaded method value trigger with alternatives for '=> Unit' parameter
Overloaded method value trigger with alternatives for '=> Unit' parameter
will be helpful for those in need Note MyRx.trigger { () => in the error message. First, you need to remove the () => part (it may be on the next line after { as well).=> Unit as a parameter type is a by-name parameter, it automatically turns a block
TAG : scala
Date : October 14 2020, 08:10 PM , By : Joe Amodio
Unselecting "Run worksheet in the compiler process" causes source file not to be found
Unselecting "Run worksheet in the compiler process" causes source file not to be found
should help you out This is a known bug, please vote on the issue: https://youtrack.jetbrains.com/issue/SCL-14694
TAG : scala
Date : October 14 2020, 02:24 PM , By : Diego Lima
Why adding two List[Map[String, Any]] changes the output result type to List[Equals] in scala?
Why adding two List[Map[String, Any]] changes the output result type to List[Equals] in scala?
I wish this helpful for you I believe the reason is because it's the common trait between List[Tuple2] and List[Map[String, Any]].If you did something like this, the types would align:
TAG : scala
Date : October 14 2020, 02:21 PM , By : Neil
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