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How to switch off Snowball stemmer for tsearch2?

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Hello.

We use ispell dictionaries for tsearch2 (ru_ispell_cp1251)..
Now Snowball stemmer is also configured.

How to properly switch OFF Snowball stemmer for Russian without turning off ispell stemmer? (It is really needed, because "Ivanov" is not the same as "Ivan".)
Is it enough and correct to simply delete the row from pg_ts_dict or not?

Here is the dump of pg_ts_dict table:

dict_name    dict_init    dict_initoption    dict_lexize    dict_comment
en_ispell    spell_init(internal)    DictFile=/usr/lib/ispell/english.med,AffFile=/usr/lib/ispell/english.aff,StopFile=/usr/share/pgsql/contrib/english.stop    spell_lexize(internal,internal,integer)   
en_stem    snb_en_init(internal)    contrib/english.stop    snb_lexize(internal,internal,integer)    English Stemmer. Snowball.
ispell_template    spell_init(internal)        spell_lexize(internal,internal,integer)    ISpell interface. Must have .dict and .aff files
ru_ispell_cp1251    spell_init(internal)    DictFile=/usr/lib/ispell/russian.med,AffFile=/usr/lib/ispell/russian.aff,StopFile=/usr/share/pgsql/contrib/russian.stop.cp1251    spell_lexize(internal,internal,integer)   
ru_stem_cp1251    snb_ru_init_cp1251(internal)    contrib/russian.stop.cp1251    snb_lexize(internal,internal,integer)    Russian Stemmer. Snowball. WINDOWS (cp1251) Encoding
ru_stem_koi8    snb_ru_init_koi8(internal)    contrib/russian.stop    snb_lexize(internal,internal,integer)    Russian Stemmer. Snowball. KOI8 Encoding
ru_stem_utf8    snb_ru_init_utf8(internal)    contrib/russian.stop.utf8    snb_lexize(internal,internal,integer)    Russian Stemmer. Snowball. UTF8 Encoding
simple    dex_init(internal)        dex_lexize(internal,internal,integer)    Simple example of dictionary.
synonym    syn_init(internal)        syn_lexize(internal,internal,integer)    Example of synonym dictionary
thesaurus_template    thesaurus_init(internal)        thesaurus_lexize(internal,internal,integer,internal)    Thesaurus template, must be pointed Dictionary and DictFile

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