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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, or had its shard key
refined. 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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