Hi Joel, Thanks for the clarification.
Would like to check, is this the correct way to do the join? Currently, I could not get any results after putting in the hashJoin for the 3rd, smallerStream collection (collection3). http://localhost:8983/solr/collection1/stream?expr=hashJoin(parallel(collection2 , innerJoin( search(collection2, q=*:*, fl="a_s,b_s,c_s,d_s,e_s", sort="a_s asc", partitionKeys="a_s", rows=200), search(collection1, q=*:*, fl="a_s,f_s,g_s,h_s,i_s,j_s", sort="a_s asc", partitionKeys="a_s", rows=200), on="a_s"), workers="2", sort="a_s asc"), hashed=search(collection3, q=*:*, fl="a_s,k_s,l_s", sort="a_s asc", rows=200), on="a_s") &indent=true Regards, Edwin On 3 May 2017 at 20:59, Joel Bernstein <joels...@gmail.com> wrote: > Sorry, it's just called hashJoin > > Joel Bernstein > http://joelsolr.blogspot.com/ > > On Wed, May 3, 2017 at 2:45 AM, Zheng Lin Edwin Yeo <edwinye...@gmail.com> > wrote: > > > Hi Joel, > > > > I am getting this error when I used the innerHashJoin. > > > > "EXCEPTION":"Invalid stream expression innerHashJoin(parallel(innerJoin > > > > I also can't find the documentation on innerHashJoin for the Streaming > > Expressions. > > > > Are you referring to hashJoin? > > > > Regards, > > Edwin > > > > > > On 3 May 2017 at 13:20, Zheng Lin Edwin Yeo <edwinye...@gmail.com> > wrote: > > > > > Hi Joel, > > > > > > Thanks for the info. > > > > > > Regards, > > > Edwin > > > > > > > > > On 3 May 2017 at 02:04, Joel Bernstein <joels...@gmail.com> wrote: > > > > > >> Also take a look at the documentation for the "fetch" streaming > > >> expression. > > >> > > >> Joel Bernstein > > >> http://joelsolr.blogspot.com/ > > >> > > >> On Tue, May 2, 2017 at 2:03 PM, Joel Bernstein <joels...@gmail.com> > > >> wrote: > > >> > > >> > Yes you join more then one collection with Streaming Expressions. > Here > > >> are > > >> > a few things to keep in mind. > > >> > > > >> > * You'll likely want to use the parallel function around the largest > > >> join. > > >> > You'll need to use the join keys as the partitionKeys. > > >> > * innerJoin: requires that the streams be sorted on the join keys. > > >> > * innerHashJoin: has no sorting requirement. > > >> > > > >> > So a strategy for a three collection join might look like this: > > >> > > > >> > innerHashJoin(parallel(innerJoin(bigStream, bigStream)), > > smallerStream) > > >> > > > >> > The largest join can be done in parallel using an innerJoin. You can > > >> then > > >> > wrap the stream coming out of the parallel function in an > > innerHashJoin > > >> to > > >> > join it to another stream. > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > Joel Bernstein > > >> > http://joelsolr.blogspot.com/ > > >> > > > >> > On Mon, May 1, 2017 at 9:42 PM, Zheng Lin Edwin Yeo < > > >> edwinye...@gmail.com> > > >> > wrote: > > >> > > > >> >> Hi, > > >> >> > > >> >> Is it possible to join more than 2 collections using one of the > > >> streaming > > >> >> expressions (Eg: innerJoin)? If not, is there other ways we can do > > it? > > >> >> > > >> >> Currently, I may need to join 3 or 4 collections together, and to > > >> output > > >> >> selected fields from all these collections together. > > >> >> > > >> >> I'm using Solr 6.4.2. > > >> >> > > >> >> Regards, > > >> >> Edwin > > >> >> > > >> > > > >> > > > >> > > > > > > > > >
