davisp commented on a change in pull request #1201: This fixes
couch_bt_engine:fold_local_docs/4
URL: https://github.com/apache/couchdb/pull/1201#discussion_r172037448
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File path: src/couch/src/couch_bt_engine.erl
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@@ -464,7 +464,10 @@ fold_docs(St, UserFun, UserAcc, Options) ->
fold_local_docs(St, UserFun, UserAcc, Options) ->
- fold_docs_int(St, St#st.local_tree, UserFun, UserAcc, Options).
+ case fold_docs_int(St, St#st.local_tree, UserFun, UserAcc, Options) of
+ {ok, _Reds, FinalAcc} -> {ok, null, FinalAcc};
Review comment:
Good call. Its actually higher up when its expected to be null in fabric.
What happens is that depending on what shards have actual docs you get a
combination of null and 0 which leads to badarith exceptions when trying to do
`0 + null` basically.
This is definitely a bit of a sharp corner on PSE vs features that assume
legacy engine behavior. But for v1 its mostly a game of trying to define
existing behavior so that we can refine what's expected/acceptable for future
engines.
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