diff options
Diffstat (limited to 'src/mongo/db/pipeline/map_reduce_options.idl')
| -rw-r--r-- | src/mongo/db/pipeline/map_reduce_options.idl | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/mongo/db/pipeline/map_reduce_options.idl b/src/mongo/db/pipeline/map_reduce_options.idl new file mode 100644 index 00000000000..55d5e133b6f --- /dev/null +++ b/src/mongo/db/pipeline/map_reduce_options.idl @@ -0,0 +1,42 @@ +# Copyright (C) 2022-present MongoDB, Inc. +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the Server Side Public License, version 1, +# as published by MongoDB, Inc. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# Server Side Public License for more details. +# +# You should have received a copy of the Server Side Public License +# along with this program. If not, see +# <http://www.mongodb.com/licensing/server-side-public-license>. +# +# As a special exception, the copyright holders give permission to link the +# code of portions of this program with the OpenSSL library under certain +# conditions as described in each individual source file and distribute +# linked combinations including the program with the OpenSSL library. You +# must comply with the Server Side Public License in all respects for +# all of the code used other than as permitted herein. If you modify file(s) +# with this exception, you may extend this exception to your version of the +# file(s), but you are not obligated to do so. If you do not wish to do so, +# delete this exception statement from your version. If you delete this +# exception statement from all source files in the program, then also delete +# it in the license file. +# + +global: + cpp_namespace: "mongo" + +server_parameters: + mrEnableSingleReduceOptimization: + description: > + In version 4.2 and before, MongoDB MapReduce will not call the reduce function + for a key that has only a single value. In version 4.4 and later, the reduce + function is still called in order to validate the JavaScript reduce function + even when there is only one value. This setting will re-enable the old optimization. + set_at: startup + cpp_vartype: bool + cpp_varname: mrSingleReduceOptimizationEnabled + default: false |