Use default TFile compression in TChain::Merge(const char *)

hahnjo · hahnjo · commit b3a5e304aa73 · 2026-04-04T11:05:11.000+02:00
Otherwise opening the file manually could give different results.
diff --git a/tree/tree/src/TChain.cxx b/tree/tree/src/TChain.cxx
@@ -1910,7 +1910,7 @@ void TChain::ls(Option_t* option) const
 
 Long64_t TChain::Merge(const char* name, Option_t* option)
 {
-   TFile *file = TFile::Open(name, "recreate", "chain files", 1);
+   TFile *file = TFile::Open(name, "recreate", "chain files");
    return Merge(file, 0, option);
 }
 

Original file line number	Diff line number	Diff line change
`@@ -1910,7 +1910,7 @@ void TChain::ls(Option_t* option) const`
`1910`	`1910`
`1911`	`1911`	`Long64_t TChain::Merge(const char* name, Option_t* option)`
`1912`	`1912`	`{`
`1913`		`- TFile *file = TFile::Open(name, "recreate", "chain files", 1);`
	`1913`	`+ TFile *file = TFile::Open(name, "recreate", "chain files");`
`1914`	`1914`	`return Merge(file, 0, option);`
`1915`	`1915`	`}`
`1916`	`1916`