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Facetted search on embedded collections takes only first element from collection

Description

From Hibernate Search Forum: Bug or not? Faceted search + embedded fields (*tomany).
Faceted search won't work correctly when used on collections. For the cause I quote Hardy Ferentschik : — The current faceting implementation utilizes the Lucene FieldCache which has a limitation that each document must have a single value for the specified field.

I can think of many use cases in which faceted search on collections is really needed, some examples:
Facetting on authors when searching for publications
Facetting on ingredients when searching for recipes
Facetting on actors when searching for movies
...

Attached is a hibernate search test case. It fails on retrieving the right amount of matched authors.

Currently I don't have the needed insight to suggest an improvement on current implementation to make it compatible with collections. Hopefully it can be achieved with small changes. Good luck slightly smiling face

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2
  • 20 Apr 2011, 01:02 PM
  • 14 Apr 2011, 10:49 AM

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Sanne GrinoveroFebruary 20, 2014 at 6:48 PM

Hardy FerentschikFebruary 16, 2014 at 12:02 PM

Is this something that can be addressed in HSearch 5.0?

I hope so. In fact I was planning to have a look at it next week winking face ...

Marc SchipperheynFebruary 16, 2014 at 11:27 AM

Is this something that can be addressed in HSearch 5.0?

Sanne GrinoveroDecember 7, 2012 at 8:14 PM

Hi Adrian,
that's not possible with the current dependencies, for the reasons explained by Hardy. To resolve this someone would need to work on HSEARCH-809, I'll ping Hardy but I don't expect him to have much time this month.

Keep in mind that even if https://hibernate.atlassian.net/browse/HSEARCH-809#icft=HSEARCH-809 provides a solution for this, it's significantly less efficient than the current implementation; would you still like it? Possibly a better idea would be to migrate to Lucene 4 first.

Adrian MeredithDecember 7, 2012 at 7:37 PM

Has this even been started? Any plans?

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Created April 14, 2011 at 10:49 AM
Updated March 5, 2014 at 11:10 AM
Resolved February 20, 2014 at 6:48 PM

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