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('abc def','abc def ghi'), word_similarity('def abc','abc def ghi');

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


select word_similarity('ghi def','abc def ghi'), word_similarity('def ghi','abc def ghi');

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


select word_similarity('ghi abc','abc def ghi'), word_similarity('abc ghi','abc def ghi');

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