[JAVA-4886] Nested maps should not shadow variables Created: 16/Feb/23  Updated: 06/Oct/23

Status: Backlog
Project: Java Driver
Component/s: Builders
Affects Version/s: None
Fix Version/s: None

Type: Bug Priority: Unknown
Reporter: Maxim Katcharov Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Quarter: FY24Q4
Documentation Changes Summary:

1. What would you like to communicate to the user about this feature?
2. Would you like the user to see examples of the syntax and/or executable code and its output?
3. Which versions of the driver/connector does this apply to?


 Description   

The following code fails:

array2d.map(a -> a.map(b -> a.sum(v -> v))) 

The code should set each cell in the row to the sum of the entire row. But because we re-use "$$this" as the variable, "a" in "a.sum" will actually refer to "b". That is, there is inappropriate shadowing of "a". Instead of using "$$this", we should use "var1", 2,3.. etc., such that the N is one higher than the N used by any sub-expression (max of all sub-expressions, + 1).


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