Hi.. I have a requirement to show 'Task Assignee' column in a Grid field

@sharmilan It's not that removing index will work correctly, because accepting the entire dataset as context and thereby accessing by using index or passing each element in the dataset as context every time are completely same. The way we build the rule just differs in our requirement but the basic functionality of the rule is same. Anyhow I have uploaded other definition of the same rule removing the index rule input. Even this new definition is also tested and it works perfectly.

The rule works even when you have the data which is a combination of User and Group objects as I have tested the rule prior to posting here. I would like to suggest few things here:
1. Make sure that the column in the report hold the data of type 'User or Group' without any formatting in the report column (for example, tostring(tp!assignees) in the column definition of portal report).
2. Make sure that the column data being passed to AT_getUserOrGroupDisplay isn't flattened.
3. Make sure that the type of inputs in AT_getUserOrGroupDisplay are as per the attached snippet.

Still if you face any issues I could help you quickly if you can attach the code snippet which contains following:
1. Call to a!queryProcessAnalytics
2. The way how AT_getUserOrGroupDisplay is being invoked on the dataset obtained from a!queryProcessAnalytics
3. Inputs (and their data types) of AT_getUserOrGroupDisplay

@sharmilan It's not that removing index will work correctly, because accepting the entire dataset as context and thereby accessing by using index or passing each element in the dataset as context every time are completely same. The way we build the rule just differs in our requirement but the basic functionality of the rule is same. Anyhow I have uploaded other definition of the same rule removing the index rule input. Even this new definition is also tested and it works perfectly.

The rule works even when you have the data which is a combination of User and Group objects as I have tested the rule prior to posting here. I would like to suggest few things here:
1. Make sure that the column in the report hold the data of type 'User or Group' without any formatting in the report column (for example, tostring(tp!assignees) in the column definition of portal report).
2. Make sure that the column data being passed to AT_getUserOrGroupDisplay isn't flattened.
3. Make sure that the type of inputs in AT_getUserOrGroupDisplay are as per the attached snippet.

Still if you face any issues I could help you quickly if you can attach the code snippet which contains following:
1. Call to a!queryProcessAnalytics
2. The way how AT_getUserOrGroupDisplay is being invoked on the dataset obtained from a!queryProcessAnalytics
3. Inputs (and their data types) of AT_getUserOrGroupDisplay