$columns = $this->safe_query_fetch($sql);
/*foreach($columns as $colk => $col) foreach($col as $key => $val) {
if(in_array($col['Field'],$disable_cols)) $columns[$colk]['Extra']='auto_increment';
$columns = $this->safe_query_fetch($sql);
/*foreach($columns as $colk => $col) foreach($col as $key => $val) {
if(in_array($col['Field'],$disable_cols)) $columns[$colk]['Extra']='auto_increment';