Change variable and namespace name in BE (#268)

Change 'palo' to 'doris'

be/src/runtime/bufferpool/buffer_pool_internal.h

@@ -15,8 +15,8 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#ifndef BDG_PALO_BE_RUNTIME_BUFFER_POOL_INTERNAL_H
-#define BDG_PALO_BE_RUNTIME_BUFFER_POOL_INTERNAL_H
+#ifndef DORIS_BE_RUNTIME_BUFFER_POOL_INTERNAL_H
+#define DORIS_BE_RUNTIME_BUFFER_POOL_INTERNAL_H
 
 #include <memory>
 #include <sstream>
@@ -35,7 +35,7 @@
 #define DCHECK_CONSISTENCY()
 #endif
 
-namespace palo {
+namespace doris {
 
 /// The internal representation of a page, which can be pinned or unpinned. See the
 /// class comment for explanation of the different page states.