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[NFC][ntuple] add clarifying comments #16686

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merged 2 commits into from
Oct 15, 2024
Merged

[NFC][ntuple] add clarifying comments #16686

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0b778c5
[NFC][ntuple] add clarifying comments
jblomer Oct 15, 2024
9532e4f
[NFC][ntuple] fix typo in code comment
jblomer Oct 15, 2024
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3 changes: 3 additions & 0 deletions tree/ntuple/v7/test/ntuple_view.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -293,6 +293,7 @@ TEST(RNTuple, ViewFrameworkUse)
auto model = RNTupleModel::Create();
auto ptrPx = model->MakeField<float>("px");
auto ptrPy = model->MakeField<float>("py");
// The trigger pages make a hole in the on-disk layout that is not (purposefully) read
model->MakeField<bool>("trigger");
auto ptrPz = model->MakeField<float>("pz");

Expand Down Expand Up @@ -346,6 +347,8 @@ TEST(RNTuple, ViewFrameworkUse)
}

// Ensure that cluster prefetching and smearing of read requests works
// Note that "nClusterLoaded" is the number of _partial_ clusters preloaded from storage. Because we read
// from the first cluster first px and then py, we'll call two times `LoadCluster()` on the first cluster.
EXPECT_LT(reader->GetDescriptor().GetNClusters(),
reader->GetMetrics().GetCounter("RNTupleReader.RPageSourceFile.nClusterLoaded")->GetValueAsInt());
EXPECT_LT(reader->GetMetrics().GetCounter("RNTupleReader.RPageSourceFile.nReadV")->GetValueAsInt(),
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