Add server default for map_index in Log table (#23056)
Add server default for map_index in Log table (#23056)

When logging CLI actions we insert a record into the Log table.  But for 2.3 we add column map_index to Log, and if the Log model expects map_index to be there the insert will fail and a warning will be emitted.

We can avoid the error and warning by adding a server_default of NULL on map_index in Log. I choose NULL instead of -1 because generally speaking map_index doesn't make sense for Log tables.
Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,apache/airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,lyft/incubator-airflow,apache/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,lyft/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,apache/airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,lyft/incubator-airflow,apache/airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,apache/airflow