There are seven methods that an index operator class for
GiST must provide:
consistent
Given a predicate p on a tree page, and a user
query, q, this method will return false if it is
certain that both p and q cannot
be true for a given data item.
union
This method consolidates information in the tree. Given a set of
entries, this function generates a new predicate that is true for all
the entries.
compress
Converts the data item into a format suitable for physical storage in
an index page.
decompress
The reverse of the compress method. Converts the
index representation of the data item into a format that can be
manipulated by the database.
penalty
Returns a value indicating the "cost" of inserting the new
entry into a particular branch of the tree. items will be inserted
down the path of least penalty in the tree.
picksplit
When a page split is necessary, this function decides which entries on
the page are to stay on the old page, and which are to move to the new
page.
same
Returns true if two entries are identical, false otherwise.
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