The PostgreSQL schema currently has a unified message table, however, the table is fed from separate CSV files.

In order to allow for easier easy experimenting, we are to add an options to the PostgreSQL converter (load.sh):

• PG_CREATE_MESSAGE_FILE: control creating a unified message data file of posts and comments. Possible values:
  • no: don't create message file, as we traditionally did. This is the default.
  • create: create message file, with no guarantee on being sorted
  • sort_by_date: create message file, sorted by creation date