In create table wizard of PGAdmin 4 when you open the column type drop-down menu, there is a type named ltree_gist.
Knowing that GIST is probably the best index option to use upon ltree columns, I suspect that ltree_gist is just ltree with an index defined on it as it is reasonable to create a ltree type column with a GIST index in just one move. But looks like its not that!
Long story short, could someone please explain the difference between ltree and ltree_gist in PGAdmin4 interface?
I could not find anything in the documentation.
ltree_gist is an implementation detail that is used for the implementation of GiST index support for ltree values. It is used for storing index entries.
That type cannot be used in SQL or table definitions directly.