Improve serialize dataTable performance (#12289)
* Improve serialize dataTable performance This seems to improve the performance of serializing a data table which is useful when archiving. In my case it made the archiving of a monthly archive twice as fast from about 120 seconds down to like 70seconds. * remove no longer needed variable * faster check whether an array key is set It is known that array_key_exists is quite a bit slower than `isset`. As this is executed easily a few million times this makes a difference in performance but here `array_key_exists` and `isset` work the same in logic as we never set `$consecutiveSubtableIds[$id]=null` * Assignment should be no longer needed as passing by reference
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