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https://issues.apache.org/jira/browse/SOLR-13175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16754485#comment-16754485
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Erick Erickson commented on SOLR-13175:
---------------------------------------
This appears to be that NULL and zero are treated equivalently.
> Rollup does not roll up NULL values.
> ------------------------------------
>
> Key: SOLR-13175
> URL: https://issues.apache.org/jira/browse/SOLR-13175
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Erick Erickson
> Priority: Major
>
> Steps to reproduce:
> - Create a 2-shard collection for sample tech products configs and index all
> the example documents to it (I always use "eoe" as my collection ;) )
> - Submit this expression:
> {code{
> rollup(
> search(eoe, q="*:*", fl="popularity", qt="/export", sort="popularity
> asc"),
> over="popularity",count(*))
> {code}
> Results: Note that the "NULL" bucket is repeated, presumably once from each
> shard. The rest of the rollup is aggregated appropriately.
> {code}
> {
> "result-set": {
> "docs": [
> {
> "count(*)": 15,
> "popularity": "NULL"
> },
> {
> "count(*)": 1,
> "popularity": 0
> },
> {
> "count(*)": 2,
> "popularity": "NULL"
> },
> {
> "count(*)": 2,
> "popularity": 1
> },
> etc.
> {code}
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