ENH: Optimize getting named destinations

[larsga]

This optimization solves the performance issue introduced by PR #3400.

Without this optimization test_merger.py takes 124 seconds on my laptop after PR 3400. With this optimization it takes 6.6 seconds.

Very likely this optimization will benefit other code as well.

[larsga]

@stefan6419846 I need some help with this. ruff and Python both are complaining about Dict in my added code, claiming it's not declared. It is imported on line 39, though. And other code uses it in exactly the same way, without ruff or Python complaining. It works for me in both Python and ruff locally. What is going on?

[stefan6419846]

Please try to rebase on the latest main - your base appears to be outdated and the corresponding import is gone in main.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.98%. Comparing base (bc318d7) to head (8465c0d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3442   +/-   ##
=======================================
  Coverage   96.97%   96.98%           
=======================================
  Files          54       54           
  Lines        9337     9344    +7     
  Branches     1711     1713    +2     
=======================================
+ Hits         9055     9062    +7     
  Misses        168      168           
  Partials      114      114           

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[larsga]

That worked. Thank you! The PR should be ready now.