How to declare GIN index on array type column when bootstrap?

[Zhang Mingli]

 Hi, all

I want to add some columns of int(or Oid) array and declare GIN index for it in 
catalog when bootstrap.

But current catalogs all use btree, I tried to declare a GIN index but failed, 
ex:
pg_class.h
```
CATALOG(pg_class
...
Int32   my_new_column[1] BKI_DEFAULT(_null_);
...
} FormData_pg_class;

DECLARE_INDEX(pg_class_my_index, 7200, on pg_class using gin(my_new_column 
array_ops));
#define ClassMYIndexId 7200
```
But this failed when init in heap_form_tuple().

I could use SQL to create GIN index column for user tables.

But is it possible to declare array column with GIN index in catalog when 
bootstrap?

Thanks.


Zhang Mingli
www.hashdata.xyz