|PostgreSQL Reference Manual - Volume 2 - Programming Guide|
by The PostgreSQL Global Development Group
Paperback (6"x9"), 408 pages
RRP £19.95 ($34.95)
Sales of this book support the PostgreSQL project! Get a printed copy>>>
5.14 Interfacing Extensions To Indexes
The procedures described thus far let you define new types, new functions, and new operators. However, we cannot yet define an index on a column of a new data type. To do this, we must define an operator class for the new data type. Later in this section, we will illustrate this concept in an example: a new operator class for the B-tree index method that stores and sorts complex numbers in ascending absolute value order.
Note: Prior to PostgreSQL release 7.3, it was necessary to make manual additions to the system catalogs
pg_opclassin order to create a user-defined operator class. That approach is now deprecated in favor of using
CREATE OPERATOR CLASS, which is a much simpler and less error-prone way of creating the necessary catalog entries.
|ISBN 0954612035||PostgreSQL Reference Manual - Volume 2 - Programming Guide||See the print edition|