Pgsql output: Remove code that alters table in append mode

This code is a half-measure that can detect some needed changes in your
database tables when you change the config after import. But this was
never tested properly and what is implemented is not enough to make this
a useful feature.

Fixes #1329

Author: joto

src/table.cpp

@@ -123,24 +123,6 @@ void table_t::start(std::string const &conninfo, std::string const &table_space)
 
         //create the table
         m_sql_conn->exec(sql);
-    } //appending
-    else {
-        //check the columns against those in the existing table
-        auto const res = m_sql_conn->query(
-            PGRES_TUPLES_OK, "SELECT * FROM {} LIMIT 0"_format(qual_name));
-        for (auto const &column : m_columns) {
-            if (res.get_column_number(column.name) < 0) {
-                log_info("Adding new column \"{}\" to \"{}\"", column.name,
-                         m_target->name);
-                m_sql_conn->exec("ALTER TABLE {} ADD COLUMN \"{}\" {}"_format(
-                    m_target->name, column.name, column.type_name));
-            }
-            // Note: we do not verify the type or delete unused columns
-        }
-
-        //TODO: check over hstore columns
-
-        //TODO: change the type of the geometry column if needed - this can only change to a more permissive type
     }
 
     prepare();