embedded HSQLDB: reclaim space occupied by deleted rows

Disadvantage is that saving/closing the file may take a significantly longer time

Change-Id: I1cc35c34b49e60d73e8d341549c5a3c5ef314b6d

connectivity/source/drivers/hsqldb/HConnection.cxx

@@ -180,7 +180,7 @@ namespace connectivity { namespace hsqldb
                 if ( !m_bReadOnly )
                 {
                     Reference< XStatement > xStmt( m_xConnection->createStatement(), UNO_QUERY_THROW );
-                    xStmt->execute( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "CHECKPOINT" ) ) );
+                    xStmt->execute( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "CHECKPOINT DEFRAG" ) ) );
                 }
             }