Reply To: Compression for null string column

[rocuinneagain]

<div>Can you test against a newer version of 4.0? </div>

My 4.1 gets much improved numbers:

q)(.z.K;.z.k)
4.1
2024.04.29
q)n:10000000;tab:([]time:n#.z.p;val:n?1000;str:n#enlist "");(`:tab/;17;2;5) set tab
`:tab/
q)-21!`:tab/str
compressedLength  | 136807
uncompressedLength| 80004096
algorithm         | 2i
logicalBlockSize  | 17i
zipLevel          | 5i
//Your compression 5.6x
q)80004096%14074225
5.684441
//Compression now 584x
80004096%136807
584.7953
q)-21!`$":tab/str#"
compressedLength  | 93
uncompressedLength| 4098
algorithm         | 2i
logicalBlockSize  | 17i
zipLevel          | 5i