[couchdb] 01/01: Avoid crashing if a mango query is reduced

[vatamane]

This is an automated email from the ASF dual-hosted git repository.

vatamane pushed a commit to branch avoid-hard-crash-on-mango-reduce
in repository https://gitbox.apache.org/repos/asf/couchdb.git

commit 59a976d0349d36dba832aba92834ed645c2b3cea
Author: Nick Vatamaniuc <vatam...@apache.org>
AuthorDate: Thu Oct 18 11:43:42 2018 -0400

    Avoid crashing if a mango query is reduced
    
    Previously returning null from mango native proc lead to case clause error 
in
    couch_query_servers. Instead return a proper shape but with null results for
    each reduction.
---
 src/mango/src/mango_native_proc.erl | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/mango/src/mango_native_proc.erl 
b/src/mango/src/mango_native_proc.erl
index 6150e1d..4c536f8 100644
--- a/src/mango/src/mango_native_proc.erl
+++ b/src/mango/src/mango_native_proc.erl
@@ -89,11 +89,11 @@ handle_call({prompt, [<<"add_fun">>, IndexInfo]}, _From, 
St) ->
 handle_call({prompt, [<<"map_doc">>, Doc]}, _From, St) ->
     {reply, map_doc(St, mango_json:to_binary(Doc)), St};
 
-handle_call({prompt, [<<"reduce">>, _, _]}, _From, St) ->
-    {reply, null, St};
+handle_call({prompt, [<<"reduce">>, RedSrcs, _]}, _From, St) ->
+    {reply, [true, [null || _ <- RedSrcs]], St};
 
-handle_call({prompt, [<<"rereduce">>, _, _]}, _From, St) ->
-    {reply, null, St};
+handle_call({prompt, [<<"rereduce">>, RedSrcs, _]}, _From, St) ->
+    {reply, [true, [null || _ <- RedSrcs]], St};
 
 handle_call({prompt, [<<"index_doc">>, Doc]}, _From, St) ->
     Vals = case index_doc(St, mango_json:to_binary(Doc)) of