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https://issues.apache.org/jira/browse/BLUR-174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13728347#comment-13728347
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Aaron McCurry commented on BLUR-174:
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- If we can have only row_id as a term in query then this is fine.
When fetching a row there can be only one rowId.
- How can we fetch documents based on fieldName/fieldValue from indexSearcher.
Because TopDocs only provides the document Ids. So might be we need to have
some other datastructure like Map to maintain all the documents with their
family name as key.
Since we are just going to convert all the documents to Records to be embedded
in the Row (for delivery) where they are just a list of Records. Currently the
way the code works it searches for all documents that contain the rowid. If
one or more families are provided in the Selector then the query is modified to
only find the families that are provided. Since there is Record paging
involved here (you can page through the Records within a single Row) I think
the best way to do this is break up the search into multiple searches.
For instance if there Row being fetched has 6 Records within it, 2 Records in
family "cf1" and 1 in "cf2" and 3 in "cf3". The order in the Row may not be
determinate because the order can be random when the MapReduce indexing is
used. So to fetch only the "cf1" and "cf3" families in that order I would
search for rowId + cf1. Fill the List of Documents. If more can/should fetch
fetched based on paging run a second search or rowid + cf3 add the result into
the list of documents and return.
- Can we have Multiple records with same family name in a particular row?
Yes they can.
> Respect family order from given selector
> ----------------------------------------
>
> Key: BLUR-174
> URL: https://issues.apache.org/jira/browse/BLUR-174
> Project: Apache Blur
> Issue Type: Bug
> Components: Blur
> Affects Versions: 0.2.0
> Reporter: Aaron McCurry
> Priority: Minor
> Fix For: 0.2.0
>
>
> We need to respect the order of the families in the selector. For instance
> if a table contains 3 families, "cf1","cf2", and "cf3". And a fetch (during
> a query or a fetch call) is performed and the order of the families are
> "cf2", "cf1" then all the records from the Row that contain "cf2" should come
> before "cf1".
> Changes needed:
> The families in the Selector object in thrift need to be changed from a set
> to a list.
> The fetchDocuments method in the BlurUtil class in blur-core needs to be
> modified to respect the family order.
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