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Merged
merged 3 commits into from
Nov 20, 2025
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Add documentation for MergeUniqueNode #1428

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721f5eb
Add documentation for MergeUniqueNode
pontusmelke Nov 20, 2025
afc4c91
fix query
stefano-ottolenghi Nov 20, 2025
7c0a594
formatting
stefano-ottolenghi Nov 20, 2025
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48 changes: 48 additions & 0 deletions modules/ROOT/pages/planning-and-tuning/operators/operators-detail.adoc
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Expand Up @@ -6056,6 +6056,54 @@ Total database accesses: 15, total allocated memory: 2232

======

[[query-plan-merge-unique-node]]
=== Merge Unique Node

////
[source, cypher, role=test-setup]
----
CREATE CONSTRAINT team_name IF NOT EXISTS FOR (t:Team) REQUIRE (t.name) IS UNIQUE
----
////

The `MergeUniqueNode` operator is similar to the xref:planning-and-tuning/operators/operators-detail.adoc#query-plan-merge[`Merge`] operator, but is used when there is a property uniqueness constraint on the property used in the `MERGE` statement.

.MergeUniqueNode
======

.Query
[source, cypher]
----
PROFILE
MERGE (t:Team {name: 'Engineering'})
----

.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 | | | | | |
| | +----+---------------------------------------------------+----------------+------+---------+----------------+ | | +--------------+
| +MergeUniqueNode | 2 | UNIQUE t:Team(name) WHERE name = $autostring_0, | 1 | 1 | 2 | 248 | 1/0 | 2.922 | Fused in Pipeline 0 | team_name: 1 |
+------------------+----+---------------------------------------------------+----------------+------+---------+----------------+------------------------+-----------+---------------------+--------------+

Total database accesses: 2, total allocated memory: 312
----

======


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