Liquibase changesets and PostgreSQL JSONB arrow functions

Question

I have a problem with liquibase and PostgreSQL JSONB arrow functions. When I trying to use such functions in liquibase changesets, for example:

CREATE UNIQUE INDEX foo_index ON public.foo (bar ->> 'bar');

I get some:

liquibase.exception.DatabaseException: ERROR: syntax error at or near "->>"

as a result during compilation. Maybe anybody knows how can such behavior be avoided. (Ignore syntax check or rewrite statement maybe).

Answer 1

CREATE UNIQUE INDEX foo_index ON public.foo (bar ->> 'bar');

Expressions need to wrapped in an extra layer of parentheses.

CREATE UNIQUE INDEX foo_index ON public.foo ((bar ->> 'bar'));

This is purely a PostgreSQL syntax issue, I think liquibase has nothing to do with it.