Changes the definition of a text search configuration.

Synopsis

ALTER TEXT SEARCH CONFIGURATION <name>
    ALTER MAPPING FOR <token_type> [, ... ] WITH <dictionary_name> [, ... ]
ALTER TEXT SEARCH CONFIGURATION <name>
    ALTER MAPPING REPLACE <old_dictionary> WITH <new_dictionary>
ALTER TEXT SEARCH CONFIGURATION <name>
    ALTER MAPPING FOR <token_type> [, ... ] REPLACE <old_dictionary> WITH <new_dictionary>
ALTER TEXT SEARCH CONFIGURATION <name>
    DROP MAPPING [ IF EXISTS ] FOR <token_type> [, ... ]
ALTER TEXT SEARCH CONFIGURATION <name> RENAME TO <new_name>
ALTER TEXT SEARCH CONFIGURATION <name> OWNER TO <new_owner>
ALTER TEXT SEARCH CONFIGURATION <name> SET SCHEMA <new_schema>

Description

ALTER TEXT SEARCH CONFIGURATION changes the definition of a text search configuration. You can modify its mappings from token types to dictionaries, or change the configuration’s name or owner.

You must be the owner of the configuration to use ALTER TEXT SEARCH CONFIGURATION.

Parameters

name

The name (optionally schema-qualified) of an existing text search configuration.

token\_type

The name of a token type that is emitted by the configuration’s parser.

dictionary\_name

The name of a text search dictionary to be consulted for the specified token type(s). If multiple dictionaries are listed, they are consulted in the specified order.

old\_dictionary

The name of a text search dictionary to be replaced in the mapping.

new\_dictionary

The name of a text search dictionary to be substituted for old_dictionary.

new\_name

The new name of the text search configuration.

new_owner

The new owner of the text search configuration.

new\_schema

The new schema for the text search configuration.

The ADD MAPPING FOR form installs a list of dictionaries to be consulted for the specified token type(s); it is an error if there is already a mapping for any of the token types. The ALTER MAPPING FOR form does the same, but first removing any existing mapping for those token types. The ALTER MAPPING REPLACE forms substitute new_dictionary for old_dictionary anywhere the latter appears. This is done for only the specified token types when FOR appears, or for all mappings of the configuration when it doesn’t. The DROP MAPPING form removes all dictionaries for the specified token type(s), causing tokens of those types to be ignored by the text search configuration. It is an error if there is no mapping for the token types, unless IF EXISTS appears.

Examples

The following example replaces the english dictionary with the swedish dictionary anywhere that english is used within my_config.

ALTER TEXT SEARCH CONFIGURATION my_config
  ALTER MAPPING REPLACE english WITH swedish;

Compatibility

There is no ALTER TEXT SEARCH CONFIGURATION statement in the SQL standard.

See Also

CREATE TEXT SEARCH CONFIGURATION, DROP TEXT SEARCH CONFIGURATION

Parent topic: SQL Commands