Partition key: LIST (date_part('year'::text, mis_ora))
As an aside, you may benefit from switching to range partitioning* depending on how your queries are written. If you have conditions such as "WHERE mis_ora BETWEEN CURRENT_DATE - 30 AND CURRENT_DATE" or similar, then the fact that your partitioning is defined as a function result will mean all partitions gets scanned instead of partitioned being pruned as early as possible in the process. That's my understanding anyway. If you always include date_part( 'year', mis_ora) comparison in your where/join conditions, then you'll likely be just fine. Do as you need.
*eg '01/01/2018' to '01/01/2019' for the 2018 partition since upper bound is always exclusive
