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15ed83adbc
The method `functions::get` is used to get the `functions::function` object of the CQL function called using `expr::function_call`. Until now `functions::get` required the caller to pass both the keyspace and the column family. The keyspace argument is always needed, as every CQL function belongs to some keyspace, but the column family isn't used in most cases. The only case where having the column family is really required is the `token()` function. Each variant of the `token()` function belongs to some table, as the arguments to the function are the consecutive partition key columns. Let's make the column family argument optional. In most cases the function will work without information about column family. In case of the `token()` function there's gonna be a check and it will throw an exception if the argument is nullopt. Signed-off-by: Jan Ciolek <jan.ciolek@scylladb.com>