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Posted to java-user@lucene.apache.org by Mikhail Khludnev <mk...@apache.org> on 2023/01/01 23:07:13 UTC
Re: Question for SynonymQuery
Hello Anh,
I was intrigued by your question. And I managed it to work somehow.
see
https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/java/org/apache/lucene/playground/TestMultiPulty.java
Beware, synonym files
https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/resources/org/apache/lucene/playground/multy-syn.txt
should use
https://lucene.apache.org/core/8_0_0/analyzers-common/org/apache/lucene/analysis/synonym/SynonymMap.html#WORD_SEPARATOR
Have a nice hack!
On Thu, Dec 29, 2022 at 10:00 AM Anh Dũng Bùi <du...@gmail.com> wrote:
> Thanks everyone for the insight. I guess I'll use BooleanQuery then.
>
> There is also a caveat I noticed (not sure if it's an issue or not), which
> is slightly different from the mentioned thread. When I have a multi-word
> synonym, let say "wifi router" and "internet device". Then using
> SynonymGraphFilter at query time (when building the SynonymMap I already
> escaped space with the backslash) would produce this TokenStream for a
> query of "wifi router"
>
> "wifi" (PositionIncrement=1,PositionLength=1), "internet"
> (PositionIncrement=0,PositionLength=1), "router"
> (PositionIncrement=1,PositionLength=1), "device"
> (PositionIncrement=0,PositionLength=1)
>
> This has the same effect as if I had 2 synonyms: "wifi"/"internet" and
> "router"/"device". If I convert this to a BooleanQuery it would become
> ("wifi" OR "internet") AND ("router" OR "device"), but what I would like to
> achieve is ("wifi" AND "router") OR ("internet" AND "device")
>
> I'm curious if there would be some workaround for this case
>
> Thanks,
> Anh Dung Bui
>
>
> On Thu, Dec 29, 2022 at 4:56 AM Michael Wechner <michael.wechner@wyona.com
> >
> wrote:
>
> > Hi Anh
> >
> > The following Stackoverflow link might help
> >
> >
> >
> https://stackoverflow.com/questions/73240494/can-someone-assist-me-with-a-multi-word-synonym-problem-in-lucene
> >
> > The following thread seems to confirm, that escaping the space with a
> > backslash does not help
> >
> > https://lists.apache.org/list?java-user@lucene.apache.org:2022-3
> >
> > HTH
> >
> > Michael
> >
> >
> > Am 27.12.22 um 20:22 schrieb Anh Dũng Bùi:
> > > Hi Lucene users,
> > >
> > > I recently came across SynonymQuery and found out that it only supports
> > > single-term synonyms (since it accepts a list of Term which will be
> > > considered as synonyms). We have some multi-term synonyms like
> "internet
> > > device" <-> "wifi router" or "dns" <-> "domain name service". Am I
> right
> > > that I need to use something like a BooleanQuery for these cases?
> > >
> > > I have 2 other follow-up questions:
> > > - Does SynonymQuery have any advantage over BooleanQuery? Or is it only
> > > different in how scores are computed? As I understand SynonymWeight
> will
> > > consider all terms as exactly the same while BooleanQuery will favor
> the
> > > documents with more matched terms.
> > > - Is it worth it to support multi-term synonyms in SynonymQuery? My
> > feeling
> > > is that it's better to just use BooleanQuery in those cases, since to
> > > support multi-term synonyms it needs to accept a list of Query, which
> > would
> > > make it behave like a BooleanQuery. Also how scoring works with
> > multi-term
> > > is another problem.
> > >
> > > Thanks & Regards!
> > >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > For additional commands, e-mail: java-user-help@lucene.apache.org
> >
> >
>
--
Sincerely yours
Mikhail Khludnev
https://t.me/MUST_SEARCH
A caveat: Cyrillic!
Re: Question for SynonymQuery
Posted by Mikhail Khludnev <mk...@apache.org>.
Hello, Santam.
It seems I achieved what you asking for.
https://github.com/mkhludnev/likely/blob/381b491d25e4d2035dd5b8a891dfdcfe2b986b90/src/test/java/org/apache/lucene/playground/TestMultiPulty.java#L32
It expands API and UI into phrases, which match like you expect.
On Fri, Jan 20, 2023 at 4:18 PM _ SATNAM <sa...@gmail.com> wrote:
> Hey Mikhail and Anh Dung Bui
> i am also struggling with synonym query
> my use case for eg
> I created synonyms for word
> API ------> Application program interface
> UI ---------> user interface
>
> doc 1 ---> This is API and it is called Application program interface
> doc2 ----> How i help you in UI things
> doc3-----> my substance interface
> doc4 ------> how to write c++ program
>
> what i want to achieve is when i search for API UI together
>
> expected result
> it must highlight ---> API and Application program interface in doc1
> ------> UI in doc2
>
> but coming output is
> it highlighted ---> API and Application program interface in doc1
> ------> UI in doc2
> -----> interface in doc 3
> ------> program in doc4
>
> Do you have any suggesting how i achieve this
>
> (API) OR (UI)
> Each term act as phrase query for API UI
> no single tokens be matched ,phrase should be matched
>
>
>
>
>
> On Thu, Jan 19, 2023 at 6:56 AM Anh Dũng Bùi <du...@gmail.com> wrote:
>
> > Thanks Mikhail!
> >
> > It turns out I used FlattenGraphFilter and cause the PositionLength to be
> > all 1 and resulted in the behavior above =)
> >
> > A side note is that we don't need to use WORD_SEPARATOR in the synonym
> > file. SynonymMap.Parser.analyze would tokenize and append the separator
> for
> > us.
> >
> > Regards,
> > Anh Dung Bui
> >
> > On Mon, Jan 2, 2023 at 8:07 Mikhail Khludnev <mk...@apache.org> wrote:
> >
> > > Hello Anh,
> > > I was intrigued by your question. And I managed it to work somehow.
> > > see
> > >
> > >
> >
> https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/java/org/apache/lucene/playground/TestMultiPulty.java
> > > Beware, synonym files
> > >
> > >
> >
> https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/resources/org/apache/lucene/playground/multy-syn.txt
> > > should use
> > >
> > >
> >
> https://lucene.apache.org/core/8_0_0/analyzers-common/org/apache/lucene/analysis/synonym/SynonymMap.html#WORD_SEPARATOR
> > > Have a nice hack!
> > >
> > > On Thu, Dec 29, 2022 at 10:00 AM Anh Dũng Bùi <du...@gmail.com>
> > wrote:
> > >
> > > > Thanks everyone for the insight. I guess I'll use BooleanQuery then.
> > > >
> > > > There is also a caveat I noticed (not sure if it's an issue or not),
> > > which
> > > > is slightly different from the mentioned thread. When I have a
> > multi-word
> > > > synonym, let say "wifi router" and "internet device". Then using
> > > > SynonymGraphFilter at query time (when building the SynonymMap I
> > already
> > > > escaped space with the backslash) would produce this TokenStream for
> a
> > > > query of "wifi router"
> > > >
> > > > "wifi" (PositionIncrement=1,PositionLength=1), "internet"
> > > > (PositionIncrement=0,PositionLength=1), "router"
> > > > (PositionIncrement=1,PositionLength=1), "device"
> > > > (PositionIncrement=0,PositionLength=1)
> > > >
> > > > This has the same effect as if I had 2 synonyms: "wifi"/"internet"
> and
> > > > "router"/"device". If I convert this to a BooleanQuery it would
> become
> > > > ("wifi" OR "internet") AND ("router" OR "device"), but what I would
> > like
> > > to
> > > > achieve is ("wifi" AND "router") OR ("internet" AND "device")
> > > >
> > > > I'm curious if there would be some workaround for this case
> > > >
> > > > Thanks,
> > > > Anh Dung Bui
> > > >
> > > >
> > > > On Thu, Dec 29, 2022 at 4:56 AM Michael Wechner <
> > > michael.wechner@wyona.com
> > > > >
> > > > wrote:
> > > >
> > > > > Hi Anh
> > > > >
> > > > > The following Stackoverflow link might help
> > > > >
> > > > >
> > > > >
> > > >
> > >
> >
> https://stackoverflow.com/questions/73240494/can-someone-assist-me-with-a-multi-word-synonym-problem-in-lucene
> > > > >
> > > > > The following thread seems to confirm, that escaping the space
> with a
> > > > > backslash does not help
> > > > >
> > > > > https://lists.apache.org/list?java-user@lucene.apache.org:2022-3
> > > > >
> > > > > HTH
> > > > >
> > > > > Michael
> > > > >
> > > > >
> > > > > Am 27.12.22 um 20:22 schrieb Anh Dũng Bùi:
> > > > > > Hi Lucene users,
> > > > > >
> > > > > > I recently came across SynonymQuery and found out that it only
> > > supports
> > > > > > single-term synonyms (since it accepts a list of Term which will
> be
> > > > > > considered as synonyms). We have some multi-term synonyms like
> > > > "internet
> > > > > > device" <-> "wifi router" or "dns" <-> "domain name service". Am
> I
> > > > right
> > > > > > that I need to use something like a BooleanQuery for these cases?
> > > > > >
> > > > > > I have 2 other follow-up questions:
> > > > > > - Does SynonymQuery have any advantage over BooleanQuery? Or is
> it
> > > only
> > > > > > different in how scores are computed? As I understand
> SynonymWeight
> > > > will
> > > > > > consider all terms as exactly the same while BooleanQuery will
> > favor
> > > > the
> > > > > > documents with more matched terms.
> > > > > > - Is it worth it to support multi-term synonyms in SynonymQuery?
> My
> > > > > feeling
> > > > > > is that it's better to just use BooleanQuery in those cases,
> since
> > to
> > > > > > support multi-term synonyms it needs to accept a list of Query,
> > which
> > > > > would
> > > > > > make it behave like a BooleanQuery. Also how scoring works with
> > > > > multi-term
> > > > > > is another problem.
> > > > > >
> > > > > > Thanks & Regards!
> > > > > >
> > > > >
> > > > >
> > > > >
> ---------------------------------------------------------------------
> > > > > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > > > > For additional commands, e-mail: java-user-help@lucene.apache.org
> > > > >
> > > > >
> > > >
> > >
> > >
> > > --
> > > Sincerely yours
> > > Mikhail Khludnev
> > > https://t.me/MUST_SEARCH
> > > A caveat: Cyrillic!
> > >
> >
>
--
Sincerely yours
Mikhail Khludnev
https://t.me/MUST_SEARCH
A caveat: Cyrillic!
Re: Question for SynonymQuery
Posted by _ SATNAM <sa...@gmail.com>.
Hey Mikhail and Anh Dung Bui
i am also struggling with synonym query
my use case for eg
I created synonyms for word
API ------> Application program interface
UI ---------> user interface
doc 1 ---> This is API and it is called Application program interface
doc2 ----> How i help you in UI things
doc3-----> my substance interface
doc4 ------> how to write c++ program
what i want to achieve is when i search for API UI together
expected result
it must highlight ---> API and Application program interface in doc1
------> UI in doc2
but coming output is
it highlighted ---> API and Application program interface in doc1
------> UI in doc2
-----> interface in doc 3
------> program in doc4
Do you have any suggesting how i achieve this
(API) OR (UI)
Each term act as phrase query for API UI
no single tokens be matched ,phrase should be matched
On Thu, Jan 19, 2023 at 6:56 AM Anh Dũng Bùi <du...@gmail.com> wrote:
> Thanks Mikhail!
>
> It turns out I used FlattenGraphFilter and cause the PositionLength to be
> all 1 and resulted in the behavior above =)
>
> A side note is that we don't need to use WORD_SEPARATOR in the synonym
> file. SynonymMap.Parser.analyze would tokenize and append the separator for
> us.
>
> Regards,
> Anh Dung Bui
>
> On Mon, Jan 2, 2023 at 8:07 Mikhail Khludnev <mk...@apache.org> wrote:
>
> > Hello Anh,
> > I was intrigued by your question. And I managed it to work somehow.
> > see
> >
> >
> https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/java/org/apache/lucene/playground/TestMultiPulty.java
> > Beware, synonym files
> >
> >
> https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/resources/org/apache/lucene/playground/multy-syn.txt
> > should use
> >
> >
> https://lucene.apache.org/core/8_0_0/analyzers-common/org/apache/lucene/analysis/synonym/SynonymMap.html#WORD_SEPARATOR
> > Have a nice hack!
> >
> > On Thu, Dec 29, 2022 at 10:00 AM Anh Dũng Bùi <du...@gmail.com>
> wrote:
> >
> > > Thanks everyone for the insight. I guess I'll use BooleanQuery then.
> > >
> > > There is also a caveat I noticed (not sure if it's an issue or not),
> > which
> > > is slightly different from the mentioned thread. When I have a
> multi-word
> > > synonym, let say "wifi router" and "internet device". Then using
> > > SynonymGraphFilter at query time (when building the SynonymMap I
> already
> > > escaped space with the backslash) would produce this TokenStream for a
> > > query of "wifi router"
> > >
> > > "wifi" (PositionIncrement=1,PositionLength=1), "internet"
> > > (PositionIncrement=0,PositionLength=1), "router"
> > > (PositionIncrement=1,PositionLength=1), "device"
> > > (PositionIncrement=0,PositionLength=1)
> > >
> > > This has the same effect as if I had 2 synonyms: "wifi"/"internet" and
> > > "router"/"device". If I convert this to a BooleanQuery it would become
> > > ("wifi" OR "internet") AND ("router" OR "device"), but what I would
> like
> > to
> > > achieve is ("wifi" AND "router") OR ("internet" AND "device")
> > >
> > > I'm curious if there would be some workaround for this case
> > >
> > > Thanks,
> > > Anh Dung Bui
> > >
> > >
> > > On Thu, Dec 29, 2022 at 4:56 AM Michael Wechner <
> > michael.wechner@wyona.com
> > > >
> > > wrote:
> > >
> > > > Hi Anh
> > > >
> > > > The following Stackoverflow link might help
> > > >
> > > >
> > > >
> > >
> >
> https://stackoverflow.com/questions/73240494/can-someone-assist-me-with-a-multi-word-synonym-problem-in-lucene
> > > >
> > > > The following thread seems to confirm, that escaping the space with a
> > > > backslash does not help
> > > >
> > > > https://lists.apache.org/list?java-user@lucene.apache.org:2022-3
> > > >
> > > > HTH
> > > >
> > > > Michael
> > > >
> > > >
> > > > Am 27.12.22 um 20:22 schrieb Anh Dũng Bùi:
> > > > > Hi Lucene users,
> > > > >
> > > > > I recently came across SynonymQuery and found out that it only
> > supports
> > > > > single-term synonyms (since it accepts a list of Term which will be
> > > > > considered as synonyms). We have some multi-term synonyms like
> > > "internet
> > > > > device" <-> "wifi router" or "dns" <-> "domain name service". Am I
> > > right
> > > > > that I need to use something like a BooleanQuery for these cases?
> > > > >
> > > > > I have 2 other follow-up questions:
> > > > > - Does SynonymQuery have any advantage over BooleanQuery? Or is it
> > only
> > > > > different in how scores are computed? As I understand SynonymWeight
> > > will
> > > > > consider all terms as exactly the same while BooleanQuery will
> favor
> > > the
> > > > > documents with more matched terms.
> > > > > - Is it worth it to support multi-term synonyms in SynonymQuery? My
> > > > feeling
> > > > > is that it's better to just use BooleanQuery in those cases, since
> to
> > > > > support multi-term synonyms it needs to accept a list of Query,
> which
> > > > would
> > > > > make it behave like a BooleanQuery. Also how scoring works with
> > > > multi-term
> > > > > is another problem.
> > > > >
> > > > > Thanks & Regards!
> > > > >
> > > >
> > > >
> > > > ---------------------------------------------------------------------
> > > > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > > > For additional commands, e-mail: java-user-help@lucene.apache.org
> > > >
> > > >
> > >
> >
> >
> > --
> > Sincerely yours
> > Mikhail Khludnev
> > https://t.me/MUST_SEARCH
> > A caveat: Cyrillic!
> >
>
Re: Question for SynonymQuery
Posted by Mikhail Khludnev <mk...@apache.org>.
Right. SynonymMap.html#WORD_SEPARATOR
<https://lucene.apache.org/core/8_0_0/analyzers-common/org/apache/lucene/analysis/synonym/SynonymMap.html#WORD_SEPARATOR>
was
a redundant complication. Spaces work fine.
On Thu, Jan 19, 2023 at 4:26 AM Anh Dũng Bùi <du...@gmail.com> wrote:
> Thanks Mikhail!
>
> It turns out I used FlattenGraphFilter and cause the PositionLength to be
> all 1 and resulted in the behavior above =)
>
> A side note is that we don't need to use WORD_SEPARATOR in the synonym
> file. SynonymMap.Parser.analyze would tokenize and append the separator for
> us.
>
> Regards,
> Anh Dung Bui
>
> On Mon, Jan 2, 2023 at 8:07 Mikhail Khludnev <mk...@apache.org> wrote:
>
> > Hello Anh,
> > I was intrigued by your question. And I managed it to work somehow.
> > see
> >
> >
> https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/java/org/apache/lucene/playground/TestMultiPulty.java
> > Beware, synonym files
> >
> >
> https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/resources/org/apache/lucene/playground/multy-syn.txt
> > should use
> >
> >
> https://lucene.apache.org/core/8_0_0/analyzers-common/org/apache/lucene/analysis/synonym/SynonymMap.html#WORD_SEPARATOR
> > Have a nice hack!
> >
> > On Thu, Dec 29, 2022 at 10:00 AM Anh Dũng Bùi <du...@gmail.com>
> wrote:
> >
> > > Thanks everyone for the insight. I guess I'll use BooleanQuery then.
> > >
> > > There is also a caveat I noticed (not sure if it's an issue or not),
> > which
> > > is slightly different from the mentioned thread. When I have a
> multi-word
> > > synonym, let say "wifi router" and "internet device". Then using
> > > SynonymGraphFilter at query time (when building the SynonymMap I
> already
> > > escaped space with the backslash) would produce this TokenStream for a
> > > query of "wifi router"
> > >
> > > "wifi" (PositionIncrement=1,PositionLength=1), "internet"
> > > (PositionIncrement=0,PositionLength=1), "router"
> > > (PositionIncrement=1,PositionLength=1), "device"
> > > (PositionIncrement=0,PositionLength=1)
> > >
> > > This has the same effect as if I had 2 synonyms: "wifi"/"internet" and
> > > "router"/"device". If I convert this to a BooleanQuery it would become
> > > ("wifi" OR "internet") AND ("router" OR "device"), but what I would
> like
> > to
> > > achieve is ("wifi" AND "router") OR ("internet" AND "device")
> > >
> > > I'm curious if there would be some workaround for this case
> > >
> > > Thanks,
> > > Anh Dung Bui
> > >
> > >
> > > On Thu, Dec 29, 2022 at 4:56 AM Michael Wechner <
> > michael.wechner@wyona.com
> > > >
> > > wrote:
> > >
> > > > Hi Anh
> > > >
> > > > The following Stackoverflow link might help
> > > >
> > > >
> > > >
> > >
> >
> https://stackoverflow.com/questions/73240494/can-someone-assist-me-with-a-multi-word-synonym-problem-in-lucene
> > > >
> > > > The following thread seems to confirm, that escaping the space with a
> > > > backslash does not help
> > > >
> > > > https://lists.apache.org/list?java-user@lucene.apache.org:2022-3
> > > >
> > > > HTH
> > > >
> > > > Michael
> > > >
> > > >
> > > > Am 27.12.22 um 20:22 schrieb Anh Dũng Bùi:
> > > > > Hi Lucene users,
> > > > >
> > > > > I recently came across SynonymQuery and found out that it only
> > supports
> > > > > single-term synonyms (since it accepts a list of Term which will be
> > > > > considered as synonyms). We have some multi-term synonyms like
> > > "internet
> > > > > device" <-> "wifi router" or "dns" <-> "domain name service". Am I
> > > right
> > > > > that I need to use something like a BooleanQuery for these cases?
> > > > >
> > > > > I have 2 other follow-up questions:
> > > > > - Does SynonymQuery have any advantage over BooleanQuery? Or is it
> > only
> > > > > different in how scores are computed? As I understand SynonymWeight
> > > will
> > > > > consider all terms as exactly the same while BooleanQuery will
> favor
> > > the
> > > > > documents with more matched terms.
> > > > > - Is it worth it to support multi-term synonyms in SynonymQuery? My
> > > > feeling
> > > > > is that it's better to just use BooleanQuery in those cases, since
> to
> > > > > support multi-term synonyms it needs to accept a list of Query,
> which
> > > > would
> > > > > make it behave like a BooleanQuery. Also how scoring works with
> > > > multi-term
> > > > > is another problem.
> > > > >
> > > > > Thanks & Regards!
> > > > >
> > > >
> > > >
> > > > ---------------------------------------------------------------------
> > > > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > > > For additional commands, e-mail: java-user-help@lucene.apache.org
> > > >
> > > >
> > >
> >
> >
> > --
> > Sincerely yours
> > Mikhail Khludnev
> > https://t.me/MUST_SEARCH
> > A caveat: Cyrillic!
> >
>
--
Sincerely yours
Mikhail Khludnev
https://t.me/MUST_SEARCH
A caveat: Cyrillic!
Re: Question for SynonymQuery
Posted by Anh Dũng Bùi <du...@gmail.com>.
Thanks Mikhail!
It turns out I used FlattenGraphFilter and cause the PositionLength to be
all 1 and resulted in the behavior above =)
A side note is that we don't need to use WORD_SEPARATOR in the synonym
file. SynonymMap.Parser.analyze would tokenize and append the separator for
us.
Regards,
Anh Dung Bui
On Mon, Jan 2, 2023 at 8:07 Mikhail Khludnev <mk...@apache.org> wrote:
> Hello Anh,
> I was intrigued by your question. And I managed it to work somehow.
> see
>
> https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/java/org/apache/lucene/playground/TestMultiPulty.java
> Beware, synonym files
>
> https://github.com/mkhludnev/likely/blob/eval-mulyw-syns/src/test/resources/org/apache/lucene/playground/multy-syn.txt
> should use
>
> https://lucene.apache.org/core/8_0_0/analyzers-common/org/apache/lucene/analysis/synonym/SynonymMap.html#WORD_SEPARATOR
> Have a nice hack!
>
> On Thu, Dec 29, 2022 at 10:00 AM Anh Dũng Bùi <du...@gmail.com> wrote:
>
> > Thanks everyone for the insight. I guess I'll use BooleanQuery then.
> >
> > There is also a caveat I noticed (not sure if it's an issue or not),
> which
> > is slightly different from the mentioned thread. When I have a multi-word
> > synonym, let say "wifi router" and "internet device". Then using
> > SynonymGraphFilter at query time (when building the SynonymMap I already
> > escaped space with the backslash) would produce this TokenStream for a
> > query of "wifi router"
> >
> > "wifi" (PositionIncrement=1,PositionLength=1), "internet"
> > (PositionIncrement=0,PositionLength=1), "router"
> > (PositionIncrement=1,PositionLength=1), "device"
> > (PositionIncrement=0,PositionLength=1)
> >
> > This has the same effect as if I had 2 synonyms: "wifi"/"internet" and
> > "router"/"device". If I convert this to a BooleanQuery it would become
> > ("wifi" OR "internet") AND ("router" OR "device"), but what I would like
> to
> > achieve is ("wifi" AND "router") OR ("internet" AND "device")
> >
> > I'm curious if there would be some workaround for this case
> >
> > Thanks,
> > Anh Dung Bui
> >
> >
> > On Thu, Dec 29, 2022 at 4:56 AM Michael Wechner <
> michael.wechner@wyona.com
> > >
> > wrote:
> >
> > > Hi Anh
> > >
> > > The following Stackoverflow link might help
> > >
> > >
> > >
> >
> https://stackoverflow.com/questions/73240494/can-someone-assist-me-with-a-multi-word-synonym-problem-in-lucene
> > >
> > > The following thread seems to confirm, that escaping the space with a
> > > backslash does not help
> > >
> > > https://lists.apache.org/list?java-user@lucene.apache.org:2022-3
> > >
> > > HTH
> > >
> > > Michael
> > >
> > >
> > > Am 27.12.22 um 20:22 schrieb Anh Dũng Bùi:
> > > > Hi Lucene users,
> > > >
> > > > I recently came across SynonymQuery and found out that it only
> supports
> > > > single-term synonyms (since it accepts a list of Term which will be
> > > > considered as synonyms). We have some multi-term synonyms like
> > "internet
> > > > device" <-> "wifi router" or "dns" <-> "domain name service". Am I
> > right
> > > > that I need to use something like a BooleanQuery for these cases?
> > > >
> > > > I have 2 other follow-up questions:
> > > > - Does SynonymQuery have any advantage over BooleanQuery? Or is it
> only
> > > > different in how scores are computed? As I understand SynonymWeight
> > will
> > > > consider all terms as exactly the same while BooleanQuery will favor
> > the
> > > > documents with more matched terms.
> > > > - Is it worth it to support multi-term synonyms in SynonymQuery? My
> > > feeling
> > > > is that it's better to just use BooleanQuery in those cases, since to
> > > > support multi-term synonyms it needs to accept a list of Query, which
> > > would
> > > > make it behave like a BooleanQuery. Also how scoring works with
> > > multi-term
> > > > is another problem.
> > > >
> > > > Thanks & Regards!
> > > >
> > >
> > >
> > > ---------------------------------------------------------------------
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> > >
> > >
> >
>
>
> --
> Sincerely yours
> Mikhail Khludnev
> https://t.me/MUST_SEARCH
> A caveat: Cyrillic!
>