Fix cpplint issue

wesm · wesm · commit f2ebeba84dd9 · 2017-08-09T15:52:57.000-04:00
Change-Id: I0c09b8149c628697e55d17eecef92e651eac48ed
diff --git a/cpp/src/arrow/python/numpy-internal.h b/cpp/src/arrow/python/numpy-internal.h
@@ -25,6 +25,7 @@
 #include "arrow/python/platform.h"
 
 #include <cstdint>
+#include <string>
 
 namespace arrow {
 namespace py {
