Chris M. Hostetter created SOLR-15078:
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Summary: ExpandComponent treats all docs with '0' in a numeric
collapse field the same as if null
Key: SOLR-15078
URL: https://issues.apache.org/jira/browse/SOLR-15078
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Chris M. Hostetter
ExpandComponent has an equivalent to the collapse qparser bug tracked in
SOLR-15047...
{quote}...has some very, _very_, old code/semantics in it that date back to
when the {{FieldCache}} was incapable of differentiating between a document
that contained '0' in the field being un-inverted, and a document that didn't
have any value in that field.
This limitation does not exist in DocValues (nor has it existed for a long
time) but as the DocValues API has evolved, and as the [...] code has been
updated to take advantage of the newer APIs that make it obvious when a
document has no value in a field, the [...] code still explicitly equates "0"
in a numeric field with the "null group"
{quote}
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