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  • escape_fts() does not correctly escape * wildcards · 4 ✖

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620177365 https://github.com/simonw/datasette/issues/743#issuecomment-620177365 https://api.github.com/repos/simonw/datasette/issues/743 MDEyOklzc3VlQ29tbWVudDYyMDE3NzM2NQ== simonw 9599 2020-04-27T19:11:01Z 2020-04-27T19:11:30Z OWNER

Huh... turns out the documentation already claims that wildcards work! Closing this as wontfix:

https://datasette.readthedocs.io/en/stable/full_text_search.html#the-table-view-api

 
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 escape_fts() does not correctly escape * wildcards 607770595  
620174977 https://github.com/simonw/datasette/issues/743#issuecomment-620174977 https://api.github.com/repos/simonw/datasette/issues/743 MDEyOklzc3VlQ29tbWVudDYyMDE3NDk3Nw== simonw 9599 2020-04-27T19:05:56Z 2020-04-27T19:05:56Z OWNER

The other option would be to leave this as-is, and let people wildcard search all they want. I'm leaning in that direction.

 
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 escape_fts() does not correctly escape * wildcards 607770595  
620170826 https://github.com/simonw/datasette/issues/743#issuecomment-620170826 https://api.github.com/repos/simonw/datasette/issues/743 MDEyOklzc3VlQ29tbWVudDYyMDE3MDgyNg== simonw 9599 2020-04-27T18:58:04Z 2020-04-27T18:58:04Z OWNER

Maybe this is moot because you can't store a * character in a FTS table anyway, so it would never make sense to search for one? In which case maybe escape_fts() should just strip out * entirely?

Best source of information I could find was this tiny thread from 2014 about FTS4:

http://sqlite.1065341.n5.nabble.com/Escaping-conventions-for-FTS4-virtual-table-queries-td74589.html

Dave Baggett wrote:

What if I want docids of documents containing the exact literal token "any*"?

You would have to use one of the Unicode tokenizers, and configure it to interpret * as a token character.

how do I escape the asterisk so that it's not interpreted as a wildcard?

There are no escapes. When * is a token character, you lose the ability to do prefix searches.

I could investigate further by learning to use the fts5vocab virtual table debugging tool to see what's actually stored in those FTS5 indexes and check if * is indeed stripped by them.

https://www.sqlite.org/fts5.html#the_fts5vocab_virtual_table_module

 
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 escape_fts() does not correctly escape * wildcards 607770595  
620166959 https://github.com/simonw/datasette/issues/743#issuecomment-620166959 https://api.github.com/repos/simonw/datasette/issues/743 MDEyOklzc3VlQ29tbWVudDYyMDE2Njk1OQ== simonw 9599 2020-04-27T18:50:30Z 2020-04-27T18:50:30Z OWNER

Here's the escape_fts() function: https://github.com/simonw/datasette/blob/89c4ddd4828623888e91a1d2cb396cba12d4e7b4/datasette/utils/init.py#L742-L753

https://latest.datasette.io/fixtures?sql=select+escape_fts%28%27bar%2A%27%29

So apparently wrapping a SQLite FTS word like "bar*" doesn't prevent SQLite from expanding the wildcard.

 
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 escape_fts() does not correctly escape * wildcards 607770595  

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