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### Check duplicate issues. - [X] Checked for duplicates ### Description TTreeProcessorMP process events multiple times when you read multiple files using TChain, and some of the files have fewer...

iguinn

### Explain what you would like to see improved and how. (This description is work in progress) The TKey payload size is limited to a few (1?) GB, which may...

silverweed

### Feature description Enable in the CI Fortran also on MacOS builds, like this PR https://github.com/root-project/root/pull/15397 does for Win and Linux. This was not done in that PR because the...

dpiparo

[ntuple] Add initial in-memory index prototype

9

This PR adds (a first version of) the `RNTupleIndex`, which is an in-memory structure that maps RNTuple field values (or combinations thereof) to an entry index in the RNTuple for...

enirolf

### Explain what you would like to see improved and how. The RNTuple cluster pool read-ahead window is currently steered by number of clusters. This should be changed to number...

jblomer

[cmake] Set `fail-on-missing=ON` by default

4

Most ROOT developers and users seem to agree that autonomously toggling features at configuration time based on the environment is not good. The feature set that ROOT is built with...

guitargeek

[clang] Silence some warnings when building clang with external llvm

1

If you build clang with `builtin_llvm=OFF` you might get flooded with so many warnings that it's unsustainable. This commit suggests to silence these kind of warnings. Note that there are...

guitargeek

[ntuple] add support for std::optional<T>

1

jblomer

[df] Delete allocated node before throwing error

1

In the jitted version of the `Vary` transformation a node is allocated on the heap and its address is passed down to the function `JitVariationHelper`, which is also responsible for...

vepadulano

Calling ProcessLine in an unnamed macro leave Cling in a broken state .. sometimes

2

### Description In an unnamed macro having: ``` { gROOT->ProcessLine(statement_1); statement_2; } ``` is process line by line (per se) and `statement_2` should (and does in most case) be able...

pcanal