Postgres 9.6

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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.

select word_similarity('foo bar','foo bar baz');

ERROR:  function word_similarity(unknown, unknown) does not exist
LINE 1: select word_similarity('foo bar','foo bar baz');
               ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.


select word_similarity('baz bar','foo bar baz');

ERROR:  function word_similarity(unknown, unknown) does not exist
LINE 1: select word_similarity('baz bar','foo bar baz');
               ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.


select word_similarity('baz foo','foo bar baz');

ERROR:  function word_similarity(unknown, unknown) does not exist
LINE 1: select word_similarity('baz foo','foo bar baz');
               ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.