awk improve command - Count & Sum - awk

Question

Would like to get your suggestion to improve this command and want to remove unwanted execution to avoid time consumption,
actually i am trying to find CountOfLines and SumOf$6 group by $2,substr($3,4,6),substr($4,4,6),$10,$8,$6.
GunZip Input file contains around 300 Mn rows of lines.
Input.gz
2067,0,09-MAY-12.04:05:14,09-MAY-12.04:05:14,21-MAR-16,600,INR,RO312,20120321_1C,K1,,32
2160,0,26-MAY-14.02:05:27,26-MAY-14.02:05:27,18-APR-18,600,INR,RO414,20140418_7,K1,,30
2160,0,26-MAY-14.02:05:27,26-MAY-14.02:05:27,18-APR-18,600,INR,RO414,20140418_7,K1,,30
2160,0,26-MAY-14.02:05:27,26-MAY-14.02:05:27,18-APR-18,600,INR,RO414,20140418_7,K1,,30
2104,5,13-JAN-13.01:01:38,,13-JAN-17,4150,INR,RO113,CD1301_RC50_B1_20130113,K2,,21
Am using the below command and working fine.
zcat Input.gz | awk -F"," '{OFS=","; print $2,substr($3,4,6),substr($4,4,6),$10,$8,$6}' | \
awk -F"," 'BEGIN {count=0; sum=0; OFS=","} {key=$0; a[key]++;b[key]=b[key]+$6} \
END {for (i in a) print i,a[i],b[i]}' >Output.txt
Output.txt
0,MAY-14,MAY-14,K1,RO414,600,3,1800
0,MAY-12,MAY-12,K1,RO312,600,1,600
5,JAN-13,,K2,RO113,4150,1,4150
Any suggestion to improve the above command are welcome ..

Answer 1

This seems more efficient:
zcat Input.gz | awk -F, '{key=$2","substr($3,4,6)","substr($4,4,6)","$10","$8","$6;++a[key];b[key]=b[key]+$6}END{for(i in a)print i","a[i]","b[i]}'
Output:
0,MAY-14,MAY-14,K1,RO414,600,3,1800
0,MAY-12,MAY-12,K1,RO312,600,1,600
5,JAN-13,,K2,RO113,4150,1,4150
Uncondensed form:
zcat Input.gz | awk -F, '{
key = $2 "," substr($3, 4, 6) "," substr($4, 4, 6) "," $10 "," $8 "," $6
++a[key]
b[key] = b[key] + $6
}
END {
for (i in a)
print i "," a[i] "," b[i]
}'

Answer 2

You can do this with one awk invocation by redefining the fields according to the first awk script, i.e. something like this:
$1 = $2
$2 = substr($3, 4, 6)
$3 = substr($4, 4, 6)
$4 = $10
$5 = $8
No need to change $6 as that is the same field. Now if you base the key on the new fields, the second script will work almost unaltered. Here is how I would write it, moving the code into a script file for better readability and maintainability:
zcat Input.gz | awk -f parse.awk
Where parse.awk contains:
BEGIN {
FS = OFS = ","
}
{
$1 = $2
$2 = substr($3, 4, 6)
$3 = substr($4, 4, 6)
$4 = $10
$5 = $8
key = $1 OFS $2 OFS $3 OFS $4 OFS $5 OFS $6
a[key]++
b[key] += $6
}
END {
for (i in a)
print i, a[i], b[i]
}
You can of course still run it as a one-liner, but it will look more cryptic:
zcat Input.gz | awk '{ key = $2 FS substr($3,4,6) FS substr($4,4,6) FS $10 FS $8 FS $6; a[key]++; b[key]+=$6 } END { for (i in a) print i,a[i],b[i] }' FS=, OFS=,
Output in both cases:
0,MAY-14,MAY-14,K1,RO414,600,3,1800
0,MAY-12,MAY-12,K1,RO312,600,1,600
5,JAN-13,,K2,RO113,4150,1,4150