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# Copyright (C) 2019-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.
#
# Document source merge stage IDL file
global:
cpp_namespace: "mongo"
cpp_includes:
- "mongo/db/namespace_string.h"
- "mongo/db/pipeline/document_source_merge_spec.h"
imports:
- "mongo/db/pipeline/document_source_merge_modes.idl"
- "mongo/idl/basic_types.idl"
- "mongo/s/chunk_version.idl"
types:
MergeTargetNss:
bson_serialization_type: any
description: Names of the target database and collection. The database name defaults
to the database of the aggregation.
cpp_type: mongo::NamespaceString
serializer: "::mongo::mergeTargetNssSerializeToBSON"
deserializer: "::mongo::mergeTargetNssParseFromBSON"
MergeOnFields:
bson_serialization_type: any
description: A single field or array of fields that identify a document for merge.
cpp_type: std::vector<std::string>
serializer: "::mongo::mergeOnFieldsSerializeToBSON"
deserializer: "::mongo::mergeOnFieldsParseFromBSON"
MergeWhenMatchedPolicy:
bson_serialization_type: any
description: Defines a policy strategy describing what to do when there is a matching
document in the target collection. Can hold a value from the
MergeWhenMatchedMode enum, or a custom pipeline definition.
cpp_type: "::mongo::MergeWhenMatchedPolicy"
serializer: "::mongo::mergeWhenMatchedSerializeToBSON"
deserializer: "::mongo::mergeWhenMatchedParseFromBSON"
structs:
NamespaceSpec:
description: A document used to specify a namespace.
strict: true
fields:
db:
type: string
optional: true
description: The database field for this namespace.
coll:
type: string
optional: true
description: The collection field for this namespace.
DocumentSourceMergeSpec:
description: A document used to specify the $merge stage of an aggregation pipeline.
strict: true
fields:
into:
cpp_name: targetNss
type: MergeTargetNss
description: Target namespace to merge documents from an aggregation pipeline into.
on:
type: MergeOnFields
optional: true
description: A single field or array of fields that uniquely identify a document.
let:
type: object
optional: true
description: Specifies variables to use in the update pipeline defined in
MergeWhenMatchedPolicy when the 'whenMatched' mode is a custom
pipeline.
whenMatched:
type: MergeWhenMatchedPolicy
optional: true
description: The merge mode for the merge operation when source and target elements
match.
whenNotMatched:
type: MergeWhenNotMatchedMode
optional: true
description: The merge mode for the merge operation when source and target elements
do not match.
targetCollectionVersion:
type: ChunkVersion
optional: true
description: If set, the collection's ChunkVersion found when parsed on mongos. Can
be used to check if a collection has since been dropped and re-created,
in which case the shard key may have changed. This also can be used to
detect if the collection has gone from unsharded to sharded, and thus
now has a shard key.
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