When adding a column with a unique constraint using the addColumn change, the name of the unique constraint is ignored. A unique constraint is created but with a system-generated name.
As an example (using Liquibase 3.3.0 with Oracle 18c)
generates the following SQL statements:
but it should generate:
A workaround is to add the column with addColumn and then add the unique constraint using the addUniqueConstraint change.
Liquibase 3.3.0, Oracle 18c