Hi,
In case of list partitioned table:
1. If there is a partition accepting only null values and nothing else, then
currently the partition constraints for such a partition are constructed as
"((a IS NULL) OR (a = ANY (ARRAY[]::integer[])))".
I think there it is better to avoid constructing an empty array to avoid
executing ANY expression.
2.Also, we are constructing an expression using index 0 of arrays in
PartitionKey since currently we have only one column for list partition in key,
added an assert for this.
PFA.
Regards,
Jeevan Ladhe
