[treeplayer] Fix precision loss in TTree::Scan for 64-bit integers#22600
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guitargeek wants to merge 1 commit into
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[treeplayer] Fix precision loss in TTree::Scan for 64-bit integers#22600guitargeek wants to merge 1 commit into
guitargeek wants to merge 1 commit into
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The `"lld"` column format passed without an embedded size (e.g. via `"colsize=N col=lld"`) was not recognized as a `"long long"` modifier in **TTreeFormula::PrintValue**, so 64-bit integer branches (e.g. `ULong64_t`) were evaluated as double and rounded above 2^53. This commit fixes a off-by-one problem in the length-modifier detection to address the issue, adding also a regression test. Closes root-project#7844. 🤖 Done with the help of [Claude Code](https://claude.com/claude-code) (Claude Opus 4.8)
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The
"lld"column format passed without an embedded size (e.g. via"colsize=N col=lld") was not recognized as a"long long"modifier in TTreeFormula::PrintValue, so 64-bit integer branches (e.g.ULong64_t) were evaluated as double and rounded above 2^53.This commit fixes a off-by-one problem in the length-modifier detection to address the issue, adding also a regression test.
Closes #7844.
🤖 Done with the help of Claude Code (Claude Opus 4.8)