I'm developing a new type for character string, like varchar. I wrote operators for btree and so forth. I wonder how pattern matching operators using btree index, because btree operator class ony knows about >, >=, <=, and = operators, but operators for pattern matching, such as LIKE, are not known for btree access method.
Now my question is:
Is Postgre using btree for pattern matching query for varchar or other character string types?