collect Questions
3
Solved
I have the following array :
$array = [
'2' => ['3' => ['56' => '2'], '6' => ['48' => '2']],
'4' => ['4' => ['433' => '2', '140' => '2'], '8' => ['421' => '2', '...
3
I have a data structure in the following format:
data_hash = [
{ price: 1, count: 3 },
{ price: 2, count: 3 },
{ price: 3, count: 3 }
]
Is there an efficient way to get the values of :price ...
1
I need to do a fuzzy join between two large dataset (assuming 30Gb for each dataset) based on the similarity of two columns of string. For example:
Table 1:
Key1 |Value1
-------------
1 |qsdm f...
Susian asked 25/2, 2016 at 9:24
6
Solved
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production.
I have a table in the below format.
Name Department
Johny Dep1
Jacky Dep2
Ramu Dep1
I need an output in the below f...
8
Solved
Is there a more succinct way to get one column of a dplyr tbl as a vector, from a tbl with database back-end (i.e. the data frame/table can't be subset directly)?
require(dplyr)
db <- src_sqlit...
Catfish asked 7/2, 2014 at 2:55
3
Solved
Most ruby developers know how to save a few keystrokes by doing something like this:
array.map(&:methodname)
rather than
array.map {|x| x.methodname }
Is there any way I could apply a similar...
Ameba asked 24/11, 2013 at 19:9
2
I am trying to understand the full capabilities of collect function by going through some documentation. I am running into some challenges, specifically in the last example quoted on the page (also...
Livengood asked 28/12, 2019 at 23:15
2
Solved
Suppose I have a list of persons and would like to have Map<String, Person>, where String is person name. How should I do that in kotlin?
Allow asked 12/7, 2015 at 15:31
6
Solved
I have Googled this and got patchy / contradictory opinions - is there actually any difference between doing a map and doing a collect on an array in Ruby/Rails?
The docs don't seem to suggest an...
Aleishaalejandra asked 10/3, 2011 at 2:19
2
Solved
First things first, let me add the actual "example code":
Map<CarBrand, List<Car>> allCarsAndBrands = new HashMap();
final String bmwBrandName = "BMW";
final String...
Glynisglynn asked 10/9, 2020 at 21:2
8
Solved
Is it possible to use one call to collect to make 2 new lists? If not, how can I do this using partition?
2
Solved
I thought I was getting pretty good at Java 8 streams, but then...
I have a Foo interface:
public interface Foo {
String getKey();
Stream<Bar> bars();
}
I know I can collect a Stream<...
Germ asked 22/6, 2016 at 0:28
2
Solved
How can I use collect_set or collect_list on a dataframe after groupby. for example: df.groupby('key').collect_set('values'). I get an error: AttributeError: 'GroupedData' object has no attribute '...
9
Solved
In Ruby, what is the most expressive way to map an array in such a way that certain elements are modified and the others left untouched?
This is a straight-forward way to do it:
old_a = ["a", "b"...
Religion asked 5/3, 2009 at 11:3
2
Solved
As below:
IntStream iStream = IntStream.range(1,4);
iStream.forEach(System.out::print);
List list1 = iStream.collect(Collectors.toList());//error!
Java 1.8 compiler gives type deduction...
Brewington asked 16/11, 2018 at 7:44
3
Solved
Hey if anyone has an idea I would be really thankfull.
I'm in a Java stream and i would like to sort my list that i'll be returning.
I need to sort the list via TradPrefis ( MyObject::getTradPrefix...
Rugging asked 12/11, 2018 at 16:4
5
Look at the code:
Collection<MyDto> col = ...
MyBuilder builder = new MyBuilder();
for (MyDto dto: col) {
switch (dto.getType()) {
case FIELD1:
builder.field1(dto.getValue());
break:
...
Bullate asked 12/9, 2018 at 14:43
2
Solved
This generates a list of arrays:
$ echo -e "a 1\nb 2" | jq -R 'split(" ")'
[
"a",
"1"
]
[
"b",
"2"
]
When I slurp the input I get an array:
$ echo -e "a 1\nb 2" | jq -R 'split(" ")' | jq -s...
1
According to the accepted answer in pyspark collect_set or collect_list with groupby, when you do a collect_list on a certain column, the null values in this column are removed. I have checked and ...
Lys asked 20/3, 2018 at 22:54
2
Solved
I'm using Java 8 for grouping by data. But the results obtained are not in the order formed.
Map<GroupingKey, List<Object>> groupedResult = null;
if (!CollectionUtils.isEmpty(groupByC...
Outdistance asked 27/2, 2015 at 11:33
2
Solved
I am using Spark 1.5.
I have a column of 30 ids which I am loading as integers from a database:
val numsRDD = sqlContext
.table(constants.SOURCE_DB + "." + IDS)
.select("id")
.distinct
.map(...
Bang asked 6/12, 2016 at 16:31
4
when I am trying to run it on this folder it is throwing me ExecutorLostFailure everytime
Hi I am a beginner in Spark. I am trying to run a job on Spark 1.4.1 with 8 slave nodes with 11.7 GB memory...
Godred asked 21/7, 2015 at 2:51
2
Solved
I am quite new to Java lambdas, and I am not sure if what I want is achievable:
I have a list of objects, which I'd like to filter to extract those of them that are matching a given condition, and ...
Heywood asked 24/5, 2017 at 8:20
2
Solved
I have group of students. First I want to group them by the marks. Then I want to further group those sets into same name students together.
Map<Integer,Map<String,List<String>>>...
Kirimia asked 21/10, 2016 at 9:7
1
Solved
I'm trying to get the COLLECT function to work for me. I'm using 10g and therefore found that LISTAGG and WM_CONCAT will not work (invalid identifier errors). The data I have is for example as foll...
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