Why this, why now? I was looking some more at SOLR-6203 and what the next sub-step after the
SOLR-9660 sub-step might be. Revisiting Judith Silverman's SOLR-6203 README file, the step (1) is included in SOLR-9660 and step (2) mentions passing around SortSpecs rather than plain Sorts, with Search and TopGroups ShardResponseProcessor amongst the files affected. In principle the change for those two files should be straightforward i.e.
except that both starting points are
and so this ticket here aims to get rid of the two 'TODO' statements. The statements were added as part of
LUCENE-6900's https://svn.apache.org/viewvc?view=revision&revision=1716569 in November 2015 and Judith's original SOLR-6203.patch is from October 2015 i.e. slightly before then.
David Smiley - do you recall anything re: when/how sortWithinGroup could be null back then? From my reading of the current (master) code the sortWithinGroup would never be null now. solr/core tests pass when the if statements are removed (will attach patch and also run the non-core solr tests) but that could of course just be due to lacking test coverage.
And unrelated but noticed whilst in the code area, the patch includes a
tweak to QueryCommand.java also.