[query] nCombines calculation in tree aggregate#11920
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Consider the case where there are 100 states. We will attempt three combines because (100 + 50) / 50 is 3. In that case the third context will be an empty slice. This will trigger the errror reported by Wenhan [here](https://hail.zulipchat.com/#narrow/stream/123010-Hail-Query-0.2E2-support/topic/HailException.3A.20array.20index.20out.20of.20bounds/near/286347013).
patrick-schultz
approved these changes
Jun 16, 2022
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Consider the case where there are 100 states. We will attempt
three combines because (100 + 50) / 50 is 3. In that case the
third context will be an empty slice. This will trigger the
errror reported by Wenhan here.