Fix include error

wesm · wesm · commit f6ec09a76ee8 · 2017-09-02T14:26:06.000-04:00
Change-Id: I94d4f29318003813a28d360dd689e224744d6f44
diff --git a/cpp/src/arrow/ipc/json-integration-test.cc b/cpp/src/arrow/ipc/json-integration-test.cc
@@ -18,6 +18,7 @@
 #include <cstdint>
 #include <cstdio>
 #include <cstring>
+#include <fstream>  // IWYU pragma: keep
 #include <iostream>
 #include <memory>
 #include <string>
