`createIndex` support `CONCURRENT` flag

Description

Right now Liquibase changelog doesn't support the flag `CONCURRENT` https://www.liquibase.org/documentation/changes/create_index.html. However, in some database such as Postgres that will cause the database to be locked, so really unsafe for high volume production databases https://leopard.in.ua/2016/09/20/safe-and-unsafe-operations-postgresql#add-an-index-unsafe . Therefore it will be best if we can have a `CONCURRENT` flag for `createIndex` so we don't need to write raw SQL queries for this.

Environment

postgres 11
docker maven:3.6.1-jdk-11 image

Status

Assignee

Unassigned

Reporter

Cynthia Qiu

Labels

None

Affects versions

3.6.3

Priority

Major