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10.6.4.1 Thesaurus Configuration

To define a new thesaurus dictionary, use the thesaurus template. For example:

CREATE TEXT SEARCH DICTIONARY thesaurus_simple (
    TEMPLATE = thesaurus,
    DictFile = mythesaurus,
    Dictionary = pg_catalog.english_stem
);

Here:

• thesaurus_simple is the new dictionary's name
• mythesaurus is the base name of the thesaurus configuration file. (Its full name will be ‘$SHAREDIR/tsearch_data/mythesaurus.ths’, where $SHAREDIR means the installation shared-data directory.)
• pg_catalog.english_stem is the subdictionary (here, a Snowball English stemmer) to use for thesaurus normalization. Notice that the subdictionary will have its own configuration (for example, stop words), which is not shown here.

Now it is possible to bind the thesaurus dictionary thesaurus_simple to the desired token types in a configuration, for example:

ALTER TEXT SEARCH CONFIGURATION russian
    ALTER MAPPING FOR asciiword, asciihword, hword_asciipart
    WITH thesaurus_simple;