Lucene scans without queries

[MMcM]

planOther is not called when there is no filter at all. But the only filter(s) might be on the grouping key(s).

The code does the correct thing today. A single filter will not match getQueryForFilter. And an And will fail to match any of its children. However, that child filter check lacks a comment about why it is there, in as much as this is policy and not correctness.

So mostly this is about documentation and tests.

Still, it is possible to determine that the passed-on filter only had group filters after initially matching them and stop.