tonysun83 commented on a change in pull request #866: Fix incorrect index
selection when sort specified
URL: https://github.com/apache/couchdb/pull/866#discussion_r143022334
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File path: src/mango/src/mango_idx.erl
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@@ -70,13 +70,33 @@ get_usable_indexes(Db, Selector0, Opts) ->
?MANGO_ERROR({no_usable_index, no_index_matching_name})
end,
- SortIndexes = mango_idx:for_sort(FilteredIndexes, Opts),
- if SortIndexes /= [] -> ok; true ->
- ?MANGO_ERROR({no_usable_index, missing_sort_index})
+ UsableFilter = fun(I) -> mango_idx:is_usable(I, Selector) end,
+ UsableIndexes0 = lists:filter(UsableFilter, FilteredIndexes),
+
+ UsableIndexes1 = case has_use_index(Opts) of
+ true ->
+ UsableFilteredIndexes =
mango_cursor:maybe_filter_indexes_by_ddoc(UsableIndexes0, Opts),
Review comment:
maybe this can be written as:
```
case mango_cursor:maybe_filter_indexes_by_ddoc(UsableIndexes0, Opts) of
[] -> ?MANGO_ERROR({no_usable_index, no_usable_index_matching_name});
UsableFilteredIndexes -> UsableFilteredIndexes
end;
```
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