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https://issues.apache.org/jira/browse/SOLR-13056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16854213#comment-16854213
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Erick Erickson commented on SOLR-13056:
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I'm working on SOLR-12249, and thought "Hey! I should add some tests for
distributed faceting, grouping and sorting on SortableTextFields", and I get
zero counts for all of my sortableTextField values. I'll check in that code,
see BasicDistributedZKTest, it'll all be commented out.
> SortableTextField is trappy for faceting
> ----------------------------------------
>
> Key: SOLR-13056
> URL: https://issues.apache.org/jira/browse/SOLR-13056
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: search
> Affects Versions: 7.6
> Reporter: Toke Eskildsen
> Priority: Major
> Attachments: SOLR-13056.patch
>
>
> Using {{SortableTextField}} for distributed faceting can lead to wrong
> results. This can be demonstrated by installing the cloud-version of the
> {{gettingstarted}} sample with
> {{./solr -e cloud}}
> using defaults all the way, except for {{shards}} which should be {{3}}.
> After that a corpus can be indexed with
> {{( echo '[' ; for J in $(seq 0 99); do ID=$((J)) ; echo
> "\{\"id\":\"$ID\",\"facet_t_sort\":\"a b $J\"},"; done ; echo
> '\{"id":"duplicate_1","facet_t_sort":"a
> b"},\{"id":"duplicate_2","facet_t_sort":"a b"}]' ) | curl -s -d @- -X POST -H
> 'Content-Type: application/json'
> 'http://localhost:8983/solr/gettingstarted/update?commit=true'}}
> This will index 100 documents with a single-valued field {{facet_t_sort:"a b
> X"}} where X is the document number + 2 documents with {{facet_t_sort:"a
> b"}}. The call
> {{curl
> 'http://localhost:8983/solr/gettingstarted/select?facet.field=facet_t_sort&facet.limit=5&facet=on&q=**:**&rows=0'}}
> should return "a b" as the top facet term with count 2, but returns
> {{ {}}
> {{ "responseHeader":{}}
> {{ "zkConnected":true,}}
> {{ "status":0,}}
> {{ "QTime":13,}}
> {{ "params":{}}
> {{ "facet.limit":"5",}}
> {{ "q":":",}}
> {{ "facet.field":"facet_t_sort",}}
> {{ "rows":"0",}}
> {{ "facet":"on"} },}}
> {{ "response":{"numFound":102,"start":0,"maxScore":1.0,"docs":[]}}
> {{ },}}
> {{ "facet_counts":{}}
> {{ "facet_queries":{},}}
> {{ "facet_fields":{}}
> {{ "facet_t_sort":[}}
> {{ "a b",36,}}
> {{ "a b 0",1,}}
> {{ "a b 1",1,}}
> {{ "a b 10",1,}}
> {{ "a b 11",1]},}}
> {{ "facet_ranges":{},}}
> {{ "facet_intervals":{},}}
> {{ "facet_heatmaps":{} } } }}
> The problem is the second phase of simple faceting, where the fine-counting
> happens. In the first phase, "a b" is returned from 1 or 2 of the 3 shards.
> It wins the popularity contest as there are 2 "a b"-terms and only 1 of all
> the other terms. The 1 or 2 shards that did not deliver "a b" in the first
> phase are then queried for the count for "a b", which happens in the form of
> a {{facet_t_sort:"a b"}}-lookup. It seems that this lookup uses the analyzer
> chain and thus matches _all_ the documents in that shard (approximately
> 102/3).
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