Accessor
Access the content of gzip files.
The filename is a pathspec with a delegate accessor opening the actual gzip file.
Since gzip compressed files do not have an actual file hierarchy,
they can not be directly searched with glob(). This accessor is
therefore only really useful for opening the file for reading - or for
chaining with another accessor.
SELECT read_file(accessor="gzip", filename="F:/hello.txt.gz", length=10)
FROM scope()
Performance: GZIP files are non-seekable. This means they must be
read in sequence from start to finish. If the VQL query attempts to
seek within the file, this accessor will automatically decompress the
entire file into a temporary file so it can seek within it. This means
that performance can be extremely bad in some cases.