[Koha-devel] Zebra, Query Parsing, Search, All the things

[Tomas Cohen Arazi]

David, you didn't mention if you are getting those results with(out) using
the QueryParser, so I don't completely understand if you are proposing some
fix? Maybe provide a regression test so someone can work on it.

2015-10-13 3:26 GMT-03:00 David Cook <dcook at prosentient.com.au>:

> Hi all:
>
>
>
> I was getting 0 results when I should’ve been getting 78 results with the
> following query:
>
> Host-item:Criminology and criminal justice : an international journal
>
>
>
> I looked in the Zebra logs, and noticed that it was being transformed into
> the following:
>
>
>
> @not @and @attr 1=1033 Criminology @and @and @and @and @and criminal
> justice = an international journal @attr 1=9011 1
>
>
>
> If we decompose the RPN, we’ll see that it’s basically saying:
>
>
>
> (Host-item=Crimology and ((((criminal and justice) and = ) and
> international) and journal )) not Suppression=1
>
>
>
> The problem is that “=” is going to return 0 results, so the “and” will
> always be 0.
>
>
>
> The way to remedy this problem is to add quotes around our Host-item
> “value”:
>
>
>
> Host-item:”Criminology and criminal justice an international journal”
>
>
>
> This will produce the following RPN query, which returns 78 results:
>
>
>
> @not @attr 1=1033 "Criminology and criminal justice = an international
> journal" @attr 1=9011 1
>
>
>
> As far as I can tell, the = symbol is ignored. You can remove it or
> substitute another symbol and it’ll still return the same number of results.
>
>
>
> Although it looks like using * for truncation doesn’t work in double
> quotation marks... I suppose that’s because it’s already part of a term so
> you can’t really translate it into RPN separately…
>
>
>
> I notice sometimes we strip out double quotation marks from queries and
> sometimes we add them in… we should probably do something consistent…
>
>
>
> David Cook
>
> Systems Librarian
>
> Prosentient Systems
>
> 72/330 Wattle St, Ultimo, NSW 2007
>
>
>
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>



-- 
Tomás Cohen Arazi
Theke Solutions (http://theke.io)
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