Trigger with conditional predicates

Hi all and a happy new Year!

We have an Oracle schema that is to be converted to PostgreSQL, where conditional predicates are used in some triggers.

In particular, columns are populated with values if they are not specified in the update statement which is used.
Usually with an expression like this:

IF NOT UPDATING('IS_CANCELED')
THEN
:new.is_canceled := ...;
END IF;

I have not found anything similar in PostgreSQL. What is the common approach to this problem?

BR
Dirk

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