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Hi Tom,
Thank you for looking at this. You are right I couldn't find anything in the docs that would explain this.
I can't think of any rationale for producing a query like this so it does look like a bug.
Best regards,
Alastair
From: Tom Lane <tgl@xxxxxxxxxxxxx>
Sent: 10 October 2019 14:35 To: Alastair McKinley <a.mckinley@xxxxxxxxxxxxxxxxxxxx> Cc: pgsql-general@xxxxxxxxxxxxxxxxxxxx <pgsql-general@xxxxxxxxxxxxxxxxxxxx>; teodor@xxxxxxxxx <teodor@xxxxxxxxx> Subject: Re: websearch_to_tsquery() and apostrophe inside double quotes Alastair McKinley <a.mckinley@xxxxxxxxxxxxxxxxxxxx> writes:
> I am a little confused about what us being generated by websearch_to_tsquery() in the case of an apostrophe inside double quotes. > ... > select websearch_to_tsquery('"peter o''toole"'); > websearch_to_tsquery > ------------------------------ > 'peter' <-> ( 'o' & 'tool' ) > (1 row) > I am not quite sure what text this will actually match? I believe it's impossible for that to match anything :-(. It would require 'o' and 'tool' to match the same lexeme (one immediately after a 'peter') which of course is impossible. The underlying tsvector type seems to treat the apostrophe the same as whitespace; it separates 'o' and 'toole' into distinct words: # select to_tsvector('peter o''toole'); to_tsvector -------------------------- 'o':2 'peter':1 'tool':3 (1 row) So it seems to me that this is a bug: websearch_to_tsquery should also treat "'" like whitespace. There's certainly not anything in its documentation that suggests it should treat "'" specially. If it didn't, you'd get # select websearch_to_tsquery('"peter o toole"'); websearch_to_tsquery ---------------------------- 'peter' <-> 'o' <-> 'tool' (1 row) which would match this tsvector. regards, tom lane |
