bash command for group by count - bash

Question

I have a file in the following format
abc|1
def|2
abc|8
def|3
abc|5
xyz|3
I need to group by these words in the first column and sum the value of the second column. For instance, the output of this file should be
abc|14
def|5
xyz|3
Explanation: the corresponding values for word "abc" are 1, 8, and 5. By adding these numbers, the sum comes out to be 14 and the output becomes "abc|14". Similarly, for word "def", the corresponding values are 2 and 3. Summing up these, the final output comes out to be "def|5".
Thank you very much for the help :)
I tried the following command
awk -F "|" '{arr[$1]+=$2} END {for (i in arr) {print i"|"arr[i]}}' filename
another command which I found was
awk -F "," 'BEGIN { FS=OFS=SUBSEP=","}{arr[$1]+=$2 }END {for (i in arr) print i,arr[i]}' filename
Both didn't show me the intended results. Although I'm also in doubt of the working of these commands as well.

Answer 1

Short GNU datamash solution:
datamash -s -t\| -g1 sum 2 < filename
The output:
abc|14
def|5
xyz|3
-t\| - field separator
-g1 - group by the 1st column
sum 2 - sum up values of the 2nd column

Answer 2

I will just add an answer to fix the sorting issue you had, in your Awk logic, you don't need to use sort/uniq piped to the output of Awk, but process in Awk itself.
Referring to GNU Awk Using Predefined Array Scanning Orders with gawk, you can use the PROCINFO["sorted_in"] variable(gawk specific) to control how you want Awk to sort your final output.
Referring to the section below,
#ind_str_asc
Order by indices in ascending order compared as strings; this is the most basic sort. (Internally, array indices are always strings, so with a[2*5] = 1 the index is 10 rather than numeric 10.)
So using this in your requirement in the END clause just do,
END{PROCINFO["sorted_in"]="#ind_str_asc"; for (i in unique) print i,unique[i]}
with your full command being,
awk '
BEGIN{FS=OFS="|"}{
unique[$1]+=$2;
next
}
END{
PROCINFO["sorted_in"]="#ind_str_asc";
for (i in unique)
print i,unique[i]
}' file

Answer 3

awk -F\| '{ arry[$1]+=$2 } END { asorti(arry,arry2);for (i in arry2) { print arry2[i]"|"arry[arry2[i]]} }' filename
Your initial solution should work apart from the issue with sort. Use asorti function to sort the indices from arry to arry2 and then process these in the loop.