Issue Summary

The Assets two dimensional report sync time increases exponentially as the report's scope increases

Steps to Reproduce

1. Create an Assets Object Schema with a single object type in it
2. Add a Select Type attribute: "Select", and an Integer attribute "INT".
3. Create a CSV file with a single column: Name, with sequential numeric values 1-2000
4. Configure an Assets CSV import, using the CSV mapped to your object type:
   -Ensure that "Unknown Values" is set to "ADD", to add new options to the Select Attribute.

• Map Name datalocator to the Name attribute (Identifier)
• Map Name datalocator to both the Select and INT attributes

1. Synchronize the import.
2. See that 2000 objects were created, and Select and INT attributes are populated on all.
3. In a separate tab/window, open the UPM: Jira Administration>Manage Apps>Manage Apps. 
   Here we will monitor the Widget batch process' progress bar.
4. In Assets > Reports, create a new two dimensional report, indicate your Schema and object type, and use either the Name or Select attribute for both X and Y axis.
   Set an AQL in the report configuration: INT < n
   Where n is a number between 1 and 1000 - see below.
5. Once the Report is saved, start measuring the time it takes for the batch process to finish and close.
6. Repeat steps 8-10 for n=100, n=500, n=1000, n=1500

Expected Results

"Reasonable" time to sync an import; minutes or hours but not days

Actual Results

Tested with 16GB JVM Memory, 8 CPUs

~42K objects in the report took almost 1 week to sync!

Due to https://jira.atlassian.com/browse/JSDSERVER-16424 it will appear as if the import is not progressing / stuck for days

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available

Versions Tested