[SOLR-14073] Fix segment look ahead NPE in CollapsingQParserPlugin

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Resolved
• Fix Version/s: 8.5
• Assignee: Joel Bernstein
• Reporter: Joel Bernstein
• Created: 12/Dec/19 13:28
• Updated: 24/Mar/20 12:44
• Resolved: 09/Mar/20 23:29

Description

The CollapsingQParserPlugin has a bug that if every segment is not visited during the collect it throws an NPE. This causes the CollapsingQParserPlugin to not work when used with any feature that short circuits the segments during the collect. This includes using the CollapsingQParserPlugin twice in the same query and the time limiting collector.

Issue Links

• is related to: SOLR-14329 Add support to choose field for expand component from multiple collapse groups
• relates to: SOLR-9104 NPE in CollapsingQParser when two fq={!collapse} and zero results
• relates to: SOLR-10336 NPE during queryCache warming
• relates to: SOLR-7435 NPE can occur if CollapsingQParserPlugin is used two or more times in the same query