1) From PG 15 onward, the datlastsysoid has been removed from the table pg_database.
We have added the constant _DATABASE_LAST_SYSTEM_OID = 16383, all the objects below
this value are considered to be system objects. Modified the pgAdmin logic accordingly.
2) Concatenation operator '||' needs a specific typecast to be applied to query variables. Modified SQL's accordingly.
Fixes#7283
1) Boolean checks should not be inverted.
2) Review this redundant assignment.
3) Extract this nested ternary operation into an independent statement.
4) Unexpected empty function.
5) Immediately return this expression instead of assigning it to the temporary variable.
