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in general, user should save output of `DESC foo.bar` to a file, and pass the path to the file as the argument of `--schema-file` option of `scylla sstable` commands. the CQL statement generated from `DESC` command always include the keyspace name of the table. but in case user create the CQL statement manually and misses the keyspace name. he/she would have following assertion failure ``` scylla: cql3/statements/cf_statement.cc:49: virtual const sstring &cql3::statements::raw::cf_statement::keyspace() const: Assertion `_cf_name->has_keyspace()' failed. ``` this is not a great user experience. so, in this change, we check for the existence of keyspace before looking it up. and throw a runtime error with a better error mesage. so when the CQL statement does not have the keyspace name, the new error message would look like: ``` error processing arguments: could not load schema via schema-file: std::runtime_error (tools::do_load_schemas(): CQL statement does not have keyspace specified) ``` since this check is only performed by `do_load_schemas()` which care about the existence of keyspace, and it only expects the CQL statement to create table/keyspace/type, we just override the new `has_keyspace()` method of the corresponding types derived from `cf_statement`. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#16981