def visit_TSVECTOR(self, type, **kw):
        return "TSVECTOR" 

def downgrade():
    ### commands auto generated by Alembic - please adjust! ###
    op.add_column('web_pages', sa.Column('previous_release', sa.INTEGER(), autoincrement=False, nullable=True))
    op.create_foreign_key('web_pages_previous_release_fkey', 'web_pages', 'web_page_history', ['previous_release'], ['id'])
    op.create_table('web_page_history',
    sa.Column('id', sa.INTEGER(), nullable=False),
    sa.Column('errno', sa.INTEGER(), autoincrement=False, nullable=True),
    sa.Column('url', sa.TEXT(), autoincrement=False, nullable=False),
    sa.Column('file', sa.INTEGER(), autoincrement=False, nullable=True),
    sa.Column('distance', sa.INTEGER(), autoincrement=False, nullable=False),
    sa.Column('is_text', sa.BOOLEAN(), autoincrement=False, nullable=True),
    sa.Column('title', citext.CIText(), autoincrement=False, nullable=True),
    sa.Column('mimetype', sa.TEXT(), autoincrement=False, nullable=True),
    sa.Column('content', sa.TEXT(), autoincrement=False, nullable=True),
    sa.Column('fetchtime', postgresql.TIMESTAMP(), autoincrement=False, nullable=True),
    sa.Column('addtime', postgresql.TIMESTAMP(), autoincrement=False, nullable=True),
    sa.Column('tsv_content', postgresql.TSVECTOR(), autoincrement=False, nullable=True),
    sa.Column('root_rel', sa.INTEGER(), autoincrement=False, nullable=False),
    sa.Column('newer_rel', sa.INTEGER(), autoincrement=False, nullable=True),
    sa.Column('older_rel', sa.INTEGER(), autoincrement=False, nullable=True),
    sa.Column('contenthash', sa.TEXT(), autoincrement=False, nullable=True),
    sa.Column('is_diff', sa.BOOLEAN(), autoincrement=False, nullable=True),
    sa.ForeignKeyConstraint(['file'], ['web_files.id'], name='web_page_history_file_fkey'),
    sa.ForeignKeyConstraint(['newer_rel'], ['web_page_history.id'], name='web_page_history_newer_rel_fkey'),
    sa.ForeignKeyConstraint(['older_rel'], ['web_page_history.id'], name='web_page_history_older_rel_fkey'),
    sa.ForeignKeyConstraint(['root_rel'], ['web_pages.id'], name='web_page_history_root_rel_fkey'),
    sa.PrimaryKeyConstraint('id', name='web_page_history_pkey')
    )
    ### end Alembic commands ### 

def visit_TSVECTOR(self, type, **kw):
        return "TSVECTOR" 

def visit_TSVECTOR(self, type, **kw):
        return "TSVECTOR" 

def visit_TSVECTOR(self, type, **kw):
        return "TSVECTOR" 

def visit_TSVECTOR(self, type):
        return "TSVECTOR" 

def visit_TSVECTOR(self, type_, **kw):
        return "TSVECTOR" 

def special_types_table(self, metadata):

        # create these types so that we can issue
        # special SQL92 INTERVAL syntax
        class y2m(types.UserDefinedType, postgresql.INTERVAL):
            def get_col_spec(self):
                return "INTERVAL YEAR TO MONTH"

        class d2s(types.UserDefinedType, postgresql.INTERVAL):
            def get_col_spec(self):
                return "INTERVAL DAY TO SECOND"

        table = Table(
            "sometable",
            metadata,
            Column("id", postgresql.UUID, primary_key=True),
            Column("flag", postgresql.BIT),
            Column("bitstring", postgresql.BIT(4)),
            Column("addr", postgresql.INET),
            Column("addr2", postgresql.MACADDR),
            Column("price", postgresql.MONEY),
            Column("addr3", postgresql.CIDR),
            Column("doubleprec", postgresql.DOUBLE_PRECISION),
            Column("plain_interval", postgresql.INTERVAL),
            Column("year_interval", y2m()),
            Column("month_interval", d2s()),
            Column("precision_interval", postgresql.INTERVAL(precision=3)),
            Column("tsvector_document", postgresql.TSVECTOR),
        )

        return table 

def test_tsvector_round_trip(self, connection):
        t = Table("t1", self.metadata, Column("data", postgresql.TSVECTOR))
        t.create()
        connection.execute(t.insert(), data="a fat cat sat")
        eq_(connection.scalar(select([t.c.data])), "'a' 'cat' 'fat' 'sat'")

        connection.execute(t.update(), data="'a' 'cat' 'fat' 'mat' 'sat'")

        eq_(
            connection.scalar(select([t.c.data])),
            "'a' 'cat' 'fat' 'mat' 'sat'",
        ) 

def visit_TSVECTOR(self, type, **kw):
        return "TSVECTOR" 

def visit_TSVECTOR(self, type):
        return "TSVECTOR" 

def visit_TSVECTOR(self, type, **kw):
        return "TSVECTOR"