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$ wc -l big1.txt big2.txt big3.txt 
 3515200 big1.txt
...

$ ls -lh hash2.db 
-rw-r--r-- 1 mario mario 160M Feb  7 22:57 hash2.db

$ time ./linux-q -T "select name, sum(value) from hash.db:::kv_store g
+roup by name order by sum(value) desc, name" >out.txt

real  0m49.136s
user  0m48.667s
sys   0m0.423s

#!/usr/bin/env bash
# https://perlmonks.org/?node_id=11150232
...
done

exec "$SQLCMND" "$DB" < <(echo "$SQLSCRIPT")

#!/usr/bin/env bash
# https://perlmonks.org/?node_id=11150232
...
SQLSCRIPT="$( make_script )"

exec "$SQLCMND" "$DB" < <(echo "$SQLSCRIPT")