PostgreSQL doesn't have type in identity column.

Namespace: NHibernate.Dialect
Assembly: NHibernate (in NHibernate.dll) Version: 3.2.0.4000 (3.2.0.4000)

Syntax

C#
public override bool HasDataTypeInIdentityColumn { get; }

Visual Basic
Public Overrides ReadOnly Property HasDataTypeInIdentityColumn As Boolean Get

Visual C++
public: virtual property bool HasDataTypeInIdentityColumn { bool get () override; }

Remarks

To create an identity column it uses the SQL syntax CREATE TABLE tablename (colname SERIAL); or CREATE TABLE tablename (colname BIGSERIAL);