Liquibase createIndex column order - liquibase

Question

I'm trying to use Liquibase for our project. We mainly use Oracle database and some other database less often. I'm trying to figureout how to specify column order in case of indexes. Below is a typical create index change set.
<createIndex indexName="PK_xxxxxxx" tableName="xxxxx" unique="true">
<column name="column_1"/>
<column name="column_2"/>
<column name="column_3"/>
</createIndex>
When it comes to performance and application scalablity, column order in index matters a lot. Can you please guide me if there is a way to specify same while creating index?
PS: As per column tag documentation, attributes afterColumn, position exists and they are applicable only for create table I assume. Here is what documentation says about it.
If used in an 'addColumn' command, this attribute allows you to control where in the table column order the new column goes. Only one of beforeColumn, afterColumn or position are allowed. Since 3.1

Answer 1

Liquibase will use the order of columns as listed in the createIndex tag - very much like the DBMS uses the order specified in the create index statement.
The following changeset:
<changeSet author="arthur" id="1">
<createTable tableName="foo">
<column name="col_1" type="integer"/>
<column name="col_2" type="integer"/>
<column name="col_3" type="integer"/>
</createTable>
<createIndex indexName="ix_one" tableName="foo">
<column name="col_1"/>
<column name="col_2"/>
<column name="col_3"/>
</createIndex>
<createIndex indexName="ix_two" tableName="foo">
<column name="col_3"/>
<column name="col_2"/>
<column name="col_1"/>
</createIndex>
<createIndex indexName="ix_three" tableName="foo">
<column name="col_2"/>
<column name="col_3"/>
<column name="col_1"/>
</createIndex>
</changeSet>
will produce the following statements (when e.g. run with updateSQL):
CREATE TABLE public.foo (col_1 INT, col_2 INT, col_3 INT);
CREATE INDEX ix_one ON public.foo(col_1, col_2, col_3);
CREATE INDEX ix_two ON public.foo(col_3, col_2, col_1);
CREATE INDEX ix_three ON public.foo(col_2, col_3, col_1);