feature request: make support for java.sql.Types.DISTINCT optional

Hello,

I have noticed that the driver's method getColumns() returns
java.sql.Types.DISTINCT as DATA_TYPE for columns that are defined
through a domain. According to the JDBC specification, chapter 16.7.3,
support for the DISITNCT type is not obligatory. Current PostgreSQL
driver implementation makes impossible to use tools which doesn't handle
the DISTINCT type properly together with domain types (like Crystal
Reports Java or Hibernate reverse engineering). Since many popular
database systems does not support the DISTINCT type in their JDBC
drivers (e.g. MySQL, MS SQL Server, Oracle), I would suggest to add an
optional connection parameter for PostgreSQL which would allow for
turning off the support for DISTINCT type and cause the getColumns()
method to return base types in the DATA_TYPE field.

Regards,

Maciej Kasprzyk

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