Joel Bernstein created SOLR-14045:
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Summary: Test and review all PostFilters with grouping
Key: SOLR-14045
URL: https://issues.apache.org/jira/browse/SOLR-14045
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Joel Bernstein
SOLR-13970 throws an exception if collapsing and grouping are combined. The
issue here is that the CollapsingQParserPlugin is a postfilter that uses
DocValues during the collect. Grouping calls the postfilter twice during it's
two part grouping logic. When DocValues moved to the iterator API it was no
longer valid to call the same postfilter twice without resetting the internal
state of the DocValues caches. So, collapsing and grouping stopped working. For
the time being throwing an exception ensures that people don't uses these
features together, because unfortunately sometimes they work and sometimes they
break depending on the situation. So it's possible to get fooled into thinking
collapse and grouping work together.
We need to check the other postfilters to see if they have the same problem and
either fix them so they can be can be called repeatedly or throw exceptions
when used with grouping.
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