NAME

       ALTER_EXTENSION - change the definition of an extension

SYNOPSIS

       ALTER EXTENSION name UPDATE [ TO new_version ]
       ALTER EXTENSION name SET SCHEMA new_schema
       ALTER EXTENSION name ADD member_object
       ALTER EXTENSION name DROP member_object

       where member_object is:

         AGGREGATE agg_name (agg_type [, ...] ) |
         CAST (source_type AS target_type) |
         COLLATION object_name |
         CONVERSION object_name |
         DOMAIN object_name |
         FOREIGN DATA WRAPPER object_name |
         FOREIGN TABLE object_name |
         FUNCTION function_name ( [ [ argmode ] [ argname ] argtype [, ...] ] ) |
         OPERATOR operator_name (left_type, right_type) |
         OPERATOR CLASS object_name USING index_method |
         OPERATOR FAMILY object_name USING index_method |
         [ PROCEDURAL ] LANGUAGE object_name |
         SCHEMA object_name |
         SEQUENCE object_name |
         SERVER object_name |
         TABLE object_name |
         TEXT SEARCH CONFIGURATION object_name |
         TEXT SEARCH DICTIONARY object_name |
         TEXT SEARCH PARSER object_name |
         TEXT SEARCH TEMPLATE object_name |
         TYPE object_name |
         VIEW object_name

DESCRIPTION

       ALTER EXTENSION changes the definition of an installed extension. There are several subforms:

       UPDATE
           This form updates the extension to a newer version. The extension must supply a suitable update
           script (or series of scripts) that can modify the currently-installed version into the requested
           version.

       SET SCHEMA
           This form moves the extension's objects into another schema. The extension has to be relocatable for
           this command to succeed.

       ADD member_object
           This form adds an existing object to the extension. This is mainly useful in extension update
           scripts. The object will subsequently be treated as a member of the extension; notably, it can only
           be dropped by dropping the extension.

       DROP member_object
           This form removes a member object from the extension. This is mainly useful in extension update
           scripts. The object is not dropped, only disassociated from the extension.
       See Section 36.15, “Packaging Related Objects into an Extension”, in the documentation for more
       information about these operations.

       You must own the extension to use ALTER EXTENSION. The ADD/DROP forms require ownership of the
       added/dropped object as well.

PARAMETERS

       name
           The name of an installed extension.

       new_version
           The desired new version of the extension. This can be written as either an identifier or a string
           literal. If not specified, ALTER EXTENSION UPDATE attempts to update to whatever is shown as the
           default version in the extension's control file.

       new_schema
           The new schema for the extension.

       object_name, agg_name, function_name, operator_name
           The name of an object to be added to or removed from the extension. Names of tables, aggregates,
           domains, foreign tables, functions, operators, operator classes, operator families, sequences, text
           search objects, types, and views can be schema-qualified.

       agg_type
           An input data type on which the aggregate function operates. To reference a zero-argument aggregate
           function, write * in place of the list of input data types.

       source_type
           The name of the source data type of the cast.

       target_type
           The name of the target data type of the cast.

       argmode
           The mode of a function argument: IN, OUT, INOUT, or VARIADIC. If omitted, the default is IN. Note
           that ALTER EXTENSION does not actually pay any attention to OUT arguments, since only the input
           arguments are needed to determine the function's identity. So it is sufficient to list the IN, INOUT,
           and VARIADIC arguments.

       argname
           The name of a function argument. Note that ALTER EXTENSION does not actually pay any attention to
           argument names, since only the argument data types are needed to determine the function's identity.

       argtype
           The data type(s) of the function's arguments (optionally schema-qualified), if any.

       left_type, right_type
           The data type(s) of the operator's arguments (optionally schema-qualified). Write NONE for the
           missing argument of a prefix or postfix operator.

       PROCEDURAL
           This is a noise word.

EXAMPLES

       To update the hstore extension to version 2.0:

           ALTER EXTENSION hstore UPDATE TO '2.0';

       To change the schema of the hstore extension to utils:

           ALTER EXTENSION hstore SET SCHEMA utils;

       To add an existing function to the hstore extension:

           ALTER EXTENSION hstore ADD FUNCTION populate_record(anyelement, hstore);

COMPATIBILITY

       ALTER EXTENSION is a PostgreSQL extension.

SEE ALSO

       CREATE EXTENSION (CREATE_EXTENSION(7)), DROP EXTENSION (DROP_EXTENSION(7))

Postgres-XC 1.1                                    2014-04-07                                 ALTER EXTENSION(7)