The sort function in table does not sort numerically in Zeppelin
Type:Number not work
Related
{
A: "numeric",
B: "numeric",
C: "numeric",
}
In general, what is the time complexity of sorting by multiple columns?
I have never found a website that has an option for multi-column sorting. That begs the question, is this operation simply to costly?
If the number of columns that you are sorting by is constant, than it doesn't factor into the big O runtime complexity of the sorting algorithm.
The different columns are handled in the comparator. Pseudo code for that is:
if column A values different
compare values from column A
else if column B values different
compare values from column B
else if column C values different
compare values from column C
else
they are equal
The first thing column you are sorting by is usually the only column consulted. The others are just used for tie breakers. It doesn't matter if you are sorting just one column or several, your sorting algorithm is still going to run in O(n*log(n)) time complexity.
I'm new to Apache Flink. I'm confused why there isn't any aggregate() transformation for non-widowed datastreams. I only have reduce(). So, for now, my workaround has been to call map() just before the reduce() and to use map to create an accumulator of size 1 (ie essentially, the element I wish to add); then, the reduce function essentially does what the merge function in the normal aggregate would do, but this is potentially not very efficient. Is there a good workaround?
I am relatively new to data structures and algorithms and while learning about the nuances of binary search I noticed that almost every solution assumes an array sorted in ascending order and hence their solutions wont work for test cases with input array sorted in descending order.
So I was wondering whether is it a pre-requisite to mention the sorting order in the problem statement or should I go with a generalised approach that runs for both ascending and descending order?
Any help/suggestions would be appreciated. Thanks.
You need to know about the order of sorting (whether it is ascending or descending) before binary searching.
Assuming you have a binary search implementation that works for ascending order, but your array is in descending order. You can simply reverse the array and do a binary search on it.
You are able to sort an array related to another array using the overloaded version of Array.Sort()
But is this possible in any way for the Array.Reverse() method too? I am required to reverse sort an array, and sort a related array with the same sort as the reversed one.
Assuming that CSV file has very large data set on each column.I want to read from one specific column and sort (Bubble or insertion sort) them in descending order. I'm sure how to approach this problem.