title: Neo4j add property to relationship when using apoc.merge.relationship()
body: <p>I have the following import:</p>
  
  <pre><code>// NO ATTACHMENT OR LINK
  USING PERIODIC COMMIT 1000
  LOAD CSV WITH HEADERS FROM ("file:///sessions/Hourly_Parsed/2019-12-10_00_hourly_parsed_mail_logs.csv") AS row
  MERGE (a:Sender { name: row.From, domain: row.Sender_Sub_Fld, datetime: datetime(replace(row.DateTime, ' ', 'T'))})
  MERGE (b:Recipient { name: row.To, datetime: datetime(replace(row.DateTime, ' ', 'T'))})
  WITH a,b,row
  WHERE row.Url = "false" AND row.FileHash = "false"
  CALL apoc.merge.relationship(a, row.Outcome2, {}, {}, b) YIELD rel as rel1
  RETURN a,b
  </code></pre>
  
  <p>As you can see I have added the datetime property to both the <code>Sender</code> and <code>Recipient</code> nodes.  I would like to add this property to the relationship.  The problem that I am running into is that my property is created using <code>apoc.merge.relationship()</code> so that I can create the name based on the outcome in the rows column.  </p>
  
  <p>Can I add something below the <code>CALL</code> portion to add the <code>datetime: datetime(replace(row.DateTime, ' ', 'T'))</code> as a property to the relationship?</p>