Hello,
The manual says: https://www.postgresql.org/docs/current/sql-createtrigger.html
A column list cannot be specified when requesting transition relations.
And (I think the same point):
The standard allows transition tables to be used with column-specific UPDATE triggers, but then the set of rows that should be visible in the transition tables depends on the trigger's column list. This is not currently implemented by PostgreSQL.
Are there any plans to allow transition tables to be used with column-specific UPDATE triggers? Or, is there another way for a trigger function to see the rows changed by a column-specific UPDATE trigger?
Thanks