Improve logic to refresh branch addresses of TChain friends #19322
+286
−81
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pcanal
reviewed
Jul 9, 2025
Test Results 20 files 20 suites 3d 11h 8m 2s ⏱️ For more details on these failures, see this check. Results for commit 8dc827c. ♻️ This comment has been updated with latest results. |
vepadulano
changed the title
Part of the logic of TChain::LoadTree deals with updating the status of friend trees. First, the current entry is loaded on all friends. In case the friend tree is a chain that needs to switch to a new tree, the branch addresses of the friend are also updated. This logic only considered the case of top-level friends of a TChain. Notably, it did not consider the case of a main TChain where one (or more) of the trees in the chain have themselves some friends, but not the main chain itself: TChain c1 --> TTree t1 <friendswith> TChain c2 This commit condenses the logic that updates friends in a separate method of TChain. The new method is called in TChain::LoadTree, either in the pre-existing case of top-level friends or in the new case of friends of the current tree. The new method, called RefreshFriendAddresses, needs to act: - On the main chain and on the current tree, in the case of top-level friends - On the current tree alone, in the case of friends of the current tree In the two scenarios, either we load the global entry of the chain on the friends, or the local entry of the current tree. This is done to conserve proper alignment.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Fixes #16805
Part of the logic of TChain::LoadTree deals with updating the status of friend
trees. First, the current entry is loaded on all friends. In case the friend
tree is a chain that needs to switch to a new tree, the branch addresses of the
friend are also updated.
This logic only considered the case of top-level friends of a TChain. Notably,
it did not consider the case of a main TChain where one (or more) of the trees
in the chain have themselves some friends, but not the main chain itself:
TChain c1
--> TTree t1 TChain c2
This commit condenses the logic that updates friends in a separate method of
TChain. The new method is called in TChain::LoadTree, either in the pre-existing
case of top-level friends or in the new case of friends of the current tree.
The new method, called RefreshFriendAddresses, needs to act:
In the two scenarios, either we load the global entry of the chain on the
friends, or the local entry of the current tree. This is done to conserve proper
alignment.