HHH-8318 updated test case
HHH-8318 - Problem determining qualifier to use for column names from HQL query parser in certain circumstances
HHH-8319
HHH-8319 checkstyle
HHH-8331 Create PostgreSQL9Dialect
HHH-7002 added support for "if exists" on "drop constraint"
HHH-8331 keep postgres81 as the default
Merge branch 'master' of github.com:hibernate/hibernate-orm into HHH-8306