How to find Expr#### in Execution Plan

I found this to be the more detailed answer : https://stackoverflow.com/a/49841492/235041 The value is under "Defined Values" on the property sheet

In the Execution Plan window of SSMS, right click on the operation that first calculates the expression and select Properties.

You will see the expression definition in the pane to the right.

Alternatively, you can browse the XML plan and search for the entries like that:

  <DefinedValues>
    <DefinedValue>
      <ColumnReference Column="Expr1018" />
      <ScalarOperator ScalarString="col1 + col2">
      </ScalarOperator>
    </DefinedValue>
    …
  </DefinedValues>