As a result of theĀ EZP-29938 Story which introduced PostgreSQL, the ezpublish-kernel data/mysql/schema.sql SQL schema file was supposed to be deprecated, but it's not stated clearly there.
Discovered while processing EZP-31586.
EZP-31586 Some columns are missing in schema.sql
EZP-29938 As a Maintainer I want to install eZ Platform OSS on PostgreSQL database
PR: ezsystems/ezpublish-kernel#3024