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From thiaga rajan <>
Subject Hierarchial Support - Solr
Date Wed, 18 May 2016 16:55:03 GMT

Hi Team,
   We are exploring solr for one of our project as a search engine. It was a really a great
tool around indexing and response time. While we are exploring we got the below questions
and understandings. Kindly confirm the same. 

We are actually trying to implement the search engine for a hierarchical search. (Tree structure).
We have flatten our data structure and exported the data in to solr as solr is more meant
for flat structure in terms of request and response  
Example       1       -----11-------------------------------111,112,113       ------12--------------121 
Our data structure will resemble something like the below and exported the same in Solr. Now
when the customer enters the key for search, we need to search in the below structure. Each
of the row in the below table corresponds to the each of the document in Solr.
We were able to achieve this in the below structure but need to confirm on the below items. 
1. Search the Level with the keyword and send only the parent and not the children of the
Example - if the user enters 12, then we need only 1,12 and not the children(ie 121)
I assume we dont have a choice to achieve with Solr and we need to write a custom implementation
for this. Correct me if i am wrong.
2. We need to do the distinct selection for each of the document. Example while if the search
keyword is 11, then i should send 1,11(Kind of select distinct from sql Select distinct L1,L2))
I have read various forums on this and looks like we have options around facet, grouping. 
But not exactly the same which we are asking for similar to the Sql distinct. If we are not
able to get the distinct results, how we will apply the pagination. Example - if the page
size is 1 to 10, if we have 5 duplicate documents, then if we take a distinct of those, it
might fail as still we have space for another 5 records.  We understand faceting is arranging
the results based on a faceted field rather than giving the results in the requested way.
Please confirm of our understanding on the above options. Thanks
Document structure below

| L1 | L2 | L3 |
| 1 | 11 | 111 |
| 1 | 11 | 112 |
| 1 | 11 | 113 |
| 1 | 12 | 121 |
| 1 | 13 | 131 |
| 1 | 13 | 132 |
| 1 | 13 | 133 |

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