Protect DCHECK macros by ifdef

cpp/src/arrow/util/logging.h

@@ -138,14 +138,31 @@ enum class ArrowLogLevel : int {
 
 #endif  // NDEBUG
 
+// These are internal-use macros and should not be used in public headers.
+#ifndef DCHECK
 #define DCHECK ARROW_DCHECK
+#endif
+#ifndef DCHECK_OK
 #define DCHECK_OK ARROW_DCHECK_OK
+#endif
+#ifndef DCHECK_EQ
 #define DCHECK_EQ ARROW_DCHECK_EQ
+#endif
+#ifndef DCHECK_NE
 #define DCHECK_NE ARROW_DCHECK_NE
+#endif
+#ifndef DCHECK_LE
 #define DCHECK_LE ARROW_DCHECK_LE
+#endif
+#ifndef DCHECK_LT
 #define DCHECK_LT ARROW_DCHECK_LT
+#endif
+#ifndef DCHECK_GE
 #define DCHECK_GE ARROW_DCHECK_GE
+#endif
+#ifndef DCHECK_GT
 #define DCHECK_GT ARROW_DCHECK_GT
+#endif
 
 // This code is adapted from
 // https://github.com/ray-project/ray/blob/master/src/ray/util/logging.h.