The citext module provides a case-insensitive character string data type,
citext. Essentially, it internally calls the
lower() function when comparing values. Otherwise, it behaves almost exactly like the
text data type.
The Greenplum Database
citext module is equivalent to the PostgreSQL
citext module. There are no Greenplum Database or MPP-specific considerations for the module.
citext module is installed when you install Greenplum Database. Before you can use any of the data types, operators, or functions defined in the module, you must register the
citext extension in each database in which you want to use the objects. Refer to Installing Additional Supplied Modules for more information.
See citext in the PostgreSQL documentation for detailed information about the data types, operators, and functions defined in this module.