Contains names and specification of variables that can be used in
expand methods of classes that inherit from
A data.table with the following columns:
a character vector, names of class that is able to fetch given variable.
a character vector, names of
variables in the two available styles,
a logical vector, whether the variable is scalar,
i.e. does the length of a fetched variable vector is equal to the length
ids field. Every scalar variable may be used in
a logical vector, whether the object needs the
stats = TRUE to fetch this variable.
a character vector, names of functions that are
used to compress variables to scalar variables when using
compress = TRUE) or
expand for non-scalar variables.
"NULL" means that a variable is non-compressible.
A variable can be used by the object's
extend method if it's
Scalar value is
Compression is not equal to
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