facebook/presto — pull request #1316 by dain (2014-05-19 21:44:27+00:00)
Title: Hidden columns

Allow connectors to expose columns that are hidden. A hidden column will not appear in describe table or information schema `columns` table, and will not be selected with `*`. The only way to access a hidden column is explicitly by name.

Additionally, I have added a hidden column, `row_number`, to the tpch connector for testing.