Extending GIN

Just like any other index, GIN can be extended. The following strategies are available:

On top of this, the following support functions are available:

If you are looking for a good example of how to extend GIN, consider looking at the btree_gin module in the PostgreSQL contrib directory. It is a valuable source of information and a good way for you to start your own implementation. 

If you are interested in full-text search, more information will be provided later on in this chapter.