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ALTER TEXT SEARCH DICTIONARY

Changes the definition of a text search dictionary.

Synopsis

ALTER TEXT SEARCH DICTIONARY <name> (
    <option> [ = <value> ] [, ... ]
)
ALTER TEXT SEARCH DICTIONARY <name> RENAME TO <new_name>
ALTER TEXT SEARCH DICTIONARY <name> OWNER TO { <new_owner> | CURRENT_USER | SESSION_USER }
ALTER TEXT SEARCH DICTIONARY <name> SET SCHEMA <new_schema>

Description

ALTER TEXT SEARCH DICTIONARY changes the definition of a text search dictionary. You can change the dictionary's template-specific options, or change the dictionary's name or owner.

You must be the owner of the dictionary to use ALTER TEXT SEARCH DICTIONARY.

Parameters

  • name
    • The name (optionally schema-qualified) of an existing text search dictionary.
  • option
    • The name of a template-specific option to be set for this dictionary.
  • value
    • The new value to use for a template-specific option. If the equal sign and value are omitted, then any previous setting for the option is removed from the dictionary, allowing the default to be used.
  • new_name
    • The new name of the text search dictionary.
  • new_owner
    • The new owner of the text search dictionary.
  • new_schema
    • The new schema for the text search dictionary. Template-specific options can appear in any order.

Examples

The following example command changes the stop word list for a Snowball-based dictionary. Other parameters remain unchanged.

ALTER TEXT SEARCH DICTIONARY my_dict ( StopWords = english );

The following example command changes the language option to dutch, and removes the stop word option entirely:

ALTER TEXT SEARCH DICTIONARY my_dict ( language = dutch, StopWords );

The following example command "updates" the dictionary's definition without actually changing anything:

ALTER TEXT SEARCH DICTIONARY my_dict ( dummy );

(The reason this works is that the option removal code doesn't complain if there is no such option.) This trick is useful when changing configuration files for the dictionary: the ALTER will force existing database sessions to re-read the configuration files, which they would otherwise never do if they had read them earlier.

Compatibility

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

See Also

CREATE TEXT SEARCH DICTIONARY, DROP TEXT SEARCH DICTIONARY