shard.T:select() cannot be performed w/o a primary key

[Totktonada]

A shard.T:select{} request without a primary key will search all shards.

https://tarantool.io/ru/doc/1.9/reference/reference_rock/shard.html

It is not so.

The link from https://stackoverflow.com/questions/49400956/calling-selects-to-tarantool-shards