Bryan Boreham fbca054af6 storage: don't wrap single querier in merge-queriers
If given a single querier, just return it instead of constructing a
complicated wrapper. The code in `mergeGenericQuerier` which skipped
merging when there was only one is not needed any more.

This change required a few tests to be tweaked, because they relied on
the specific behaviour of `mergeGenericQuerier.Select()`.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2024-01-31 12:14:22 +00:00
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