[GitHub] [incubator-doris] xinyiZzz commented on a change in pull request #6917: [Function] add BE bitmap function bitmap_subset_in_range

[GitBox <gi...@apache.org>]

xinyiZzz commented on a change in pull request #6917:
URL: https://github.com/apache/incubator-doris/pull/6917#discussion_r739927720



##########
File path: be/src/util/bitmap_value.h
##########
@@ -1451,6 +1451,26 @@ class BitmapValue {
         }
     }
 
+    /**
+     * Return new set with specified range (not include the range_end)
+     */
+    int64_t sub_range(const int64_t& range_start, const int64_t& range_end, BitmapValue* ret_bitmap) {
+        int64_t count = 0; 
+        for (auto it = _bitmap.begin(); it != _bitmap.end(); ++it) {
+            if (*it < range_start) {
+                continue;
+            }
+            if (*it < range_end) {
+                ret_bitmap->add(*it);
+                ++count;
+            } else {
+                break;
+            }
+        }
+        return count;

Review comment:
       If range_start is greater than bitmap max, count will be equal to 0, and finally an empty string will be output, whether to unified into "null"




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