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Here is the script with comments:
awk ' # Start awk script...
BEGIN { FS = OFS = "|" }# Before reading any lines from the input file, set the
# input file field separator (FS) and the output...

It is always a good idea to tell us what operating system and shell you're using when you start a thread like this.

The following is untested, but should do what you want (including copying the...

Perhaps something like:
awk '
function printlast() {
if(last)
print last, count, appr
count = 0
}
BEGIN { FS = OFS = ","
}
FNR == 1 {
print
next
}
last != $1 OFS $2 OFS $3 OFS $4 {...