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Nov 11, 2025
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Add documentation for MergeInto #1422

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abc107c
Add documentation for MergeInto
pontusmelke Nov 11, 2025
4cd6066
Update operators-detail.adoc
stefano-ottolenghi Nov 11, 2025
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51 changes: 51 additions & 0 deletions modules/ROOT/pages/planning-and-tuning/operators/operators-detail.adoc
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Expand Up @@ -6005,6 +6005,57 @@ Total database accesses: 4, total allocated memory: 184

======

[query-plan-merge-into]]
=== Merge Into

The `MergeInto` operator is similar to the xref:planning-and-tuning/operators/operators-detail.adoc#query-plan-merge[`Merge`] operator, but is used when the start and end node of the pattern is matched outside the `MERGE` pattern.

If necessary, the operator locks the pattern nodes before creating the relationship, to avoid creating multiple relationships between the nodes.


.MergeInto
======

.Query
[source, cypher]
----
PROFILE
MATCH (s:Person {name: 'me'})
MERGE (s)-[:FRIENDS_WITH]->(s)
----

.Query Plan
[role="queryplan", subs="attributes+"]
----
Planner COST

Runtime PIPELINED

Runtime version {neo4j-version}

Batch size 128

+-----------------+----+-------------------------------------------------------+----------------+------+---------+----------------+------------------------+-----------+---------------------+----------------------+
| Operator | Id | Details | Estimated Rows | Rows | DB Hits | Memory (Bytes) | Page Cache Hits/Misses | Time (ms) | Pipeline | Indexes Used |
+-----------------+----+-------------------------------------------------------+----------------+------+---------+----------------+------------------------+-----------+---------------------+----------------------+
| +ProduceResults | 0 | | 1 | 0 | 0 | 0 | | | | |
| | +----+-------------------------------------------------------+----------------+------+---------+----------------+ | | +----------------------+
| +EmptyResult | 1 | | 1 | 0 | 0 | | | | | |
| | +----+-------------------------------------------------------+----------------+------+---------+----------------+ | | +----------------------+
| +Apply | 2 | | 1 | 1 | 0 | | | | | |
| |\ +----+-------------------------------------------------------+----------------+------+---------+----------------+ | | +----------------------+
| | +MergeInto | 3 | MERGE (s)-[anon_0:FRIENDS_WITH]->(s) | 1 | 1 | 1 | | | | | |
| | | +----+-------------------------------------------------------+----------------+------+---------+----------------+ | | +----------------------+
| | +Argument | 4 | s | 1 | 1 | 0 | 2288 | 1/0 | 0.673 | Fused in Pipeline 1 | |
| | +----+-------------------------------------------------------+----------------+------+---------+----------------+------------------------+-----------+---------------------+----------------------+
| +NodeIndexSeek | 5 | RANGE INDEX s:Person(name) WHERE name = $autostring_0 | 1 | 1 | 2 | 376 | 1/0 | 0.256 | In Pipeline 0 | range_person_name: 1 |
+-----------------+----+-------------------------------------------------------+----------------+------+---------+----------------+------------------------+-----------+---------------------+----------------------+

Total database accesses: 15, total allocated memory: 2232
----

======


[[query-plan-locking-merge]]
=== Locking Merge
Expand Down