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diff --git a/connectivity/source/drivers/postgresql/pq_xcolumns.hxx b/connectivity/source/drivers/postgresql/pq_xcolumns.hxx
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+++ b/connectivity/source/drivers/postgresql/pq_xcolumns.hxx
@@ -0,0 +1,122 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ *  Effective License of whole file:
+ *
+ *    This library is free software; you can redistribute it and/or
+ *    modify it under the terms of the GNU Lesser General Public
+ *    License version 2.1, as published by the Free Software Foundation.
+ *
+ *    This library is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *    Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with this library; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *    MA  02111-1307  USA
+ *
+ *  Parts "Copyright by Sun Microsystems, Inc" prior to August 2011:
+ *
+ *    The Contents of this file are made available subject to the terms of
+ *    the GNU Lesser General Public License Version 2.1
+ *
+ *    Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ *    Contributor(s): Joerg Budischewski
+ *
+ *  All parts contributed on or after August 2011:
+ *
+ *    This Source Code Form is subject to the terms of the Mozilla Public
+ *    License, v. 2.0. If a copy of the MPL was not distributed with this
+ *    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <string_view>
+
+#include <rtl/ref.hxx>
+
+#include "pq_xcontainer.hxx"
+#include "pq_xbase.hxx"
+
+namespace com::sun::star::sdbc { class XRow; }
+
+namespace pq_sdbc_driver
+{
+
+void alterColumnByDescriptor(
+    std::u16string_view schemaName,
+    std::u16string_view tableName,
+    ConnectionSettings *settings,
+    const css::uno::Reference< css::sdbc::XStatement > &stmt,
+    const css::uno::Reference< css::beans::XPropertySet > & past,
+    const css::uno::Reference< css::beans::XPropertySet > & future);
+
+OUString columnMetaData2SDBCX(
+    ReflectionBase *pBase, const css::uno::Reference< css::sdbc::XRow > &xRow );
+
+class Columns final : public Container
+{
+    OUString m_schemaName;
+    OUString m_tableName;
+
+public: // instances Columns 'exception safe'
+    static css::uno::Reference< css::container::XNameAccess > create(
+        const ::rtl::Reference< comphelper::RefCountedMutex > & refMutex,
+        const css::uno::Reference< css::sdbc::XConnection >  & origin,
+        ConnectionSettings *pSettings,
+        const OUString &schemaName,
+        const OUString &tableName,
+        rtl::Reference<Columns> *pColumns);
+
+private:
+    Columns(
+        const ::rtl::Reference< comphelper::RefCountedMutex > & refMutex,
+        const css::uno::Reference< css::sdbc::XConnection >  & origin,
+        ConnectionSettings *pSettings,
+        const OUString &schemaName,
+        const OUString &tableName);
+
+
+    virtual ~Columns() override;
+
+public: // XAppend
+    virtual void SAL_CALL appendByDescriptor(
+        const css::uno::Reference< css::beans::XPropertySet >& descriptor ) override;
+
+// public: // XDrop
+//     virtual void SAL_CALL dropByName( const OUString& elementName )
+//         throw (css::sdbc::SQLException,
+//                css::container::NoSuchElementException,
+//                css::uno::RuntimeException);
+    virtual void SAL_CALL dropByIndex( sal_Int32 index ) override;
+
+public: // XRefreshable
+    virtual void SAL_CALL refresh(  ) override;
+
+public: // XDataDescriptorFactory
+    virtual css::uno::Reference< css::beans::XPropertySet > SAL_CALL createDataDescriptor(  ) override;
+};
+
+
+class ColumnDescriptors : public Container
+{
+public:
+    ColumnDescriptors(
+        const ::rtl::Reference< comphelper::RefCountedMutex > & refMutex,
+        const css::uno::Reference< css::sdbc::XConnection >  & origin,
+        ConnectionSettings *pSettings );
+
+public: // XDataDescriptorFactory
+    virtual css::uno::Reference< css::beans::XPropertySet > SAL_CALL createDataDescriptor(  ) override;
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */