Accessor
Allow reading another file from a specific offset.
The filename is taken as an offset into the delegate.
SELECT read_file(accessor="offset", filename=pathspec(
DelegateAccessor="data",
DelegatePath="Hello world",
Path="/6"))
FROM scope()
-> "world"
This accessor is useful in cases where we need to rebase the zero offset into the file. For example when reading a filesystem partition from an image.