[SOLR-15078] ExpandComponent treats all docs with '0' in a numeric collapse field the same as if null

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 9.0, 8.9
• Assignee: Chris M. Hostetter
• Reporter: Chris M. Hostetter
• Created: 08/Jan/21 18:04
• Updated: 23/Jun/21 13:42
• Resolved: 25/Jan/21 19:32

Description

ExpandComponent has an equivalent to the collapse qparser bug tracked in SOLR-15047...

...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"

 

Issue Links

• relates to: SOLR-15047 'collapse' on numeric field treats all docs with '0' in collapse field as part of the null group
• relates to: SOLR-14330 Return docs with null value in expand for field when collapse has nullPolicy=collapse