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How to sum arrays element by element after group by in clickhouse

By : Rabbits
Date : October 01 2020, 01:00 AM
Any of those help I am trying to add an array column element by element after a group by another column. , Try this query:
code :
SELECT id, sumForEach(units) units
  /* emulate dataset */
  SELECT data.1 id, data.2 units
  FROM (
    SELECT arrayJoin([(1, [1,1,1]), (2, [3,0,0]), (1, [5,3,7]), (3, [2,5,2]), (2, [3,2,6])]) data))

/* Result
│  1 │ [6,4,8] │
│  2 │ [6,2,6] │
│  3 │ [2,5,2] │

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What's the simplest way in Ruby to group an array of arrays by element order?

By : Žiga Aman
Date : March 29 2020, 07:55 AM
may help you . I think Array#transpose is what you're after:
code :
a = [[1,2], [:a, :b], [:alpha, :beta]]
p a.transpose #=> [[1, :a, :alpha], [2, :b, :beta]]

Group nested arrays by first element

By : Odeta Morkūnaitė
Date : March 29 2020, 07:55 AM
To fix this issue I had a hard time figuring out your logic, especially with that undefined testing array.
I would use a dictionary logic to collect the dates as unique keys. Plus it saves the effort to manage the lengths computing (with all the counters you have defined).
code :
var array = [[12135435123, -2],
[12135435123, 1], 
[12135464565, -2], 
[12423675834, 0], 
[12423675834, 1]];

function transform (array) {
 var dictionary = {};
 for (var i = 0 ; i < array.length ; i++){
   var date = array[i][0].toString();
   var value = array[i][1];

   // add the date to the dictionary if it's not already there
   if ((date in dictionary) === false)
     dictionary[date] = [0, 0];
   // update the count
   // update the net sum
   dictionary[date][1] += value;      

 // transform dictionary values to array
 var result = [];
 for (var key in dictionary) {
    if (Object.prototype.hasOwnProperty.call(dictionary, key)) {
        var val = dictionary[key];
 return result;


How to convert nested arrays to a group of one-element arrays

By : S. Gowri
Date : March 29 2020, 07:55 AM
I wish this helpful for you Since you now learned Smalltalk, I suggest you take a look at a recursive solution:
https://stackoverflow.com/a/9878747/1396822 .

How to group arrays in array by first element object key

By : Michael Petrick
Date : March 29 2020, 07:55 AM
wish helps you Got an array of arrays like this:
code :
let arr = [
var myMap = new Map();
for (i = 0; i < arr.length; i++) { 
    }else if(myMap.get(arr[i][0]['key'])===undefined){

var out =[];
for(var v of myMap.values()){
    var s = String(v).split(",");
    var fi = s[0]
    var subarray =[]
    for(var i in s){
    out[fi] = subarray;

where should the remote-server element located when configurating clickhouse cluster

By : Zoe Xu
Date : March 29 2020, 07:55 AM
Any of those help I'm setting up a clickhouse cluster, as the tutorial said the "remote_servers" should be added, then I turn to /etc/clickhouse-server/config.xml, I see followed with [1]: http://i.stack.imgur.com/AHBBg.png . , It could be specified in two ways.
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