groonga/groonga — pull request #28 by kou (2012-08-27 00:59:17+00:00)
Title: Add all_records()

It matches all records. It's fast rather than "true" literal because
all_records() doesn't evaluate on each record. It just copies all
record IDs to result set table.

Note that getting all records is heavy process. You should use it only
when you need it.