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https://issues.apache.org/jira/browse/SOLR-2894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13552166#comment-13552166
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Shahar Davidson commented on SOLR-2894:
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Hi Chris,
Thanks for the updated patch.
I started testing this latest patch and encountered a few problems when NULL
values are present:
(1) If, for example, FIELD_A contains null values and FIELD_B does not, then
"facet.pivot=FIELD_A,FIELD_B" will return more than 1 entry of NULLs for
FIELD_A. To be exact, it return an NULL entry per shard. (In non-distributed
search, there is a single NULL entry for FIELD_A)
(2) If facet.pivot=FIELD_B,FIELD_A then one may see that for a given of field
FIELD_B there is more than 1 entry of FIELD_A with NULL value. (In
non-distributed search, there's only 1 entry of a NULL value under a given
FIELD_B)
It seems as if there's a problem when merging null values from cross-shard
pivots.
Does the relevant test-case include some sort of check on data with null values?
As far as sorting is concerned, results seem to be sorted properly (per field
as well).
Shahar.
> Implement distributed pivot faceting
> ------------------------------------
>
> Key: SOLR-2894
> URL: https://issues.apache.org/jira/browse/SOLR-2894
> Project: Solr
> Issue Type: Improvement
> Reporter: Erik Hatcher
> Fix For: 4.2, 5.0
>
> Attachments: SOLR-2894.patch, SOLR-2894.patch, SOLR-2894.patch,
> SOLR-2894.patch, SOLR-2894.patch, SOLR-2894-reworked.patch
>
>
> Following up on SOLR-792, pivot faceting currently only supports
> undistributed mode. Distributed pivot faceting needs to be implemented.
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