Execution example:

```shell
load --table Memos
[
{"content": "Groonga is fast and embeddable full text search engine."},
{"content": "PGroonga is a PostgreSQL extension that uses Groonga."},
{"content": "PostgreSQL is a RDBMS."}
]
# [[0,1337566253.89858,0.000355720520019531],3]
```
