diff --git a/src/storage/column_store/ob_cg_bitmap.cpp b/src/storage/column_store/ob_cg_bitmap.cpp
index 8779ca331f..5d409dbf9e 100644
--- a/src/storage/column_store/ob_cg_bitmap.cpp
+++ b/src/storage/column_store/ob_cg_bitmap.cpp
@@ -34,12 +34,15 @@ int ObCGBitmap::get_first_valid_idx(const ObCSRange &range, ObCSRowId &row_idx)
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("Invalid argument", K(ret), K(range), K_(start_row_id), K(bitmap_.size()));
   } else if (is_all_false(range)) {
+  } else if (filter_constant_type_.is_always_true()) {
+    valid_offset = is_reverse_scan_ ? bitmap_.size() - 1 : 0;
   } else if (OB_FAIL(bitmap_.next_valid_idx(range.start_row_id_ - start_row_id_,
                                             range.get_row_count(),
                                             is_reverse_scan_,
                                             valid_offset))){
     LOG_WARN("Fail to get next valid idx", K(ret), K(range), KPC(this));
-  } else if (-1 != valid_offset) {
+  }
+  if (OB_SUCC(ret) && -1 != valid_offset) {
     row_idx = start_row_id_ + valid_offset;
   }
   return ret;
@@ -51,6 +54,10 @@ int ObCGBitmap::set_bitmap(const ObCSRowId start, const int64_t row_count, const
   if (OB_UNLIKELY(start < start_row_id_ || row_count != bitmap.size())) {
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("Invalid argument", K(ret), K(start), K_(start_row_id), K(row_count), K(bitmap));
+  } else if (filter_constant_type_.is_constant()) {
+    if (OB_FAIL(bitmap.set_bitmap_batch(0, row_count, filter_constant_type_.is_always_true()))) {
+      LOG_WARN("Fail to set bitmap batch", K(ret), K(row_count));
+    }
   } else if (!is_reverse) {
     if (OB_FAIL(bitmap.copy_from(bitmap_, start - start_row_id_, row_count))) {
       LOG_WARN("Fail to copy bitmap", K(ret), K(start), K(row_count), KPC(this));
diff --git a/src/storage/column_store/ob_cg_bitmap.h b/src/storage/column_store/ob_cg_bitmap.h
index dc7537a68e..a5bd1d89ac 100644
--- a/src/storage/column_store/ob_cg_bitmap.h
+++ b/src/storage/column_store/ob_cg_bitmap.h
@@ -48,6 +48,7 @@ public:
     } else if (bitmap.filter_constant_type_.is_constant()) {
       max_filter_constant_id_ = bitmap.max_filter_constant_id_;
       filter_constant_type_ = bitmap.filter_constant_type_;
+      bitmap_.reuse(filter_constant_type_.is_always_true());
     } else {
       if (OB_FAIL(bitmap_.copy_from(bitmap.bitmap_, 0, bitmap.bitmap_.size()))) {
         STORAGE_LOG(WARN, "Fail to set bitmap", K(ret), K(bitmap));
@@ -98,6 +99,9 @@ public:
   OB_INLINE int switch_context(const uint64_t count, const bool is_reverse)
   {
     is_reverse_scan_ = is_reverse;
+    filter_constant_type_.set_uncertain();
+    max_filter_constant_id_ = OB_INVALID_CS_ROW_ID;
+    start_row_id_ = OB_INVALID_CS_ROW_ID;
     return bitmap_.reserve(count);
   }
 
@@ -199,17 +203,18 @@ public:
   {
     OB_ASSERT(range.is_valid() && range.end_row_id_ >= start_row_id_);
     return filter_constant_type_.is_always_true() ||
-        bitmap_.is_all_true(MAX(range.start_row_id_ - start_row_id_, 0),
-                            MIN(range.end_row_id_ - start_row_id_, bitmap_.size() - 1));
-
+        (filter_constant_type_.is_uncertain() &&
+         bitmap_.is_all_true(MAX(range.start_row_id_ - start_row_id_, 0),
+                             MIN(range.end_row_id_ - start_row_id_, bitmap_.size() - 1)));
   }
 
   OB_INLINE bool is_all_false(const ObCSRange &range) const
   {
     OB_ASSERT(range.is_valid() && range.end_row_id_ >= start_row_id_);
     return filter_constant_type_.is_always_false() ||
-        bitmap_.is_all_false(MAX(range.start_row_id_ - start_row_id_, 0),
-                             MIN(range.end_row_id_ - start_row_id_, bitmap_.size() - 1));
+        (filter_constant_type_.is_uncertain() &&
+         bitmap_.is_all_false(MAX(range.start_row_id_ - start_row_id_, 0),
+                              MIN(range.end_row_id_ - start_row_id_, bitmap_.size() - 1)));
   }
 
   OB_INLINE void set_all_true()
diff --git a/src/storage/column_store/ob_cg_scanner.cpp b/src/storage/column_store/ob_cg_scanner.cpp
index 0b7dfb0f8f..d7397a904b 100644
--- a/src/storage/column_store/ob_cg_scanner.cpp
+++ b/src/storage/column_store/ob_cg_scanner.cpp
@@ -315,6 +315,8 @@ int ObCGScanner::apply_filter(
     ret = OB_SUCCESS;
   }
   LOG_TRACE("[COLUMNSTORE] apply filter info in cg", K(ret), K_(query_index_range), K(row_count),
+            "tablet_id", iter_param_->tablet_id_, "cg_idx", iter_param_->cg_idx_,
+            "filter_type", filter_info.filter_->get_type(),
             "filter_constant_type", result_bitmap.get_filter_constant_type(),
             "filter_constant_id", result_bitmap.get_filter_constant_id(),
             "bitmap_size", result_bitmap.size(),  "popcnt", result_bitmap.popcnt());
diff --git a/src/storage/column_store/ob_co_sstable_rows_filter.cpp b/src/storage/column_store/ob_co_sstable_rows_filter.cpp
index 18d46c419a..dc342ff3b0 100644
--- a/src/storage/column_store/ob_co_sstable_rows_filter.cpp
+++ b/src/storage/column_store/ob_co_sstable_rows_filter.cpp
@@ -221,6 +221,8 @@ int ObCOSSTableRowsFilter::apply(const ObCSRange &range)
     adjust_batch_size();
     prepared_ = false;
     LOG_DEBUG("[COLUMNSTORE] apply filter info", K(range),
+              "tablet_id", iter_param_->tablet_id_,
+              "cg_idx", iter_param_->cg_idx_,
               "filter_constant_type", bitmap_buffer_[0]->get_filter_constant_type(),
               "filter_constant_id", bitmap_buffer_[0]->get_filter_constant_id(),
               "bitmap_size", bitmap_buffer_[0]->size(),
diff --git a/unittest/storage/CMakeLists.txt b/unittest/storage/CMakeLists.txt
index 9373b9a10e..dbad7abece 100644
--- a/unittest/storage/CMakeLists.txt
+++ b/unittest/storage/CMakeLists.txt
@@ -142,6 +142,7 @@ if(OB_BUILD_CLOSE_MODULES)
   storage_unittest(test_block_gc_handler)
 endif()
 storage_unittest(test_sstable_log_ts_range_cut test_sstable_log_ts_range_cut.cpp)
+storage_unittest(test_cg_bitmap column_store/test_cg_bitmap.cpp)
 storage_unittest(test_co_sstable column_store/test_co_sstable.cpp)
 storage_unittest(test_co_sstable_rows_filter column_store/test_co_sstable_rows_filter.cpp)
 storage_unittest(test_compaction_iter compaction/test_compaction_iter.cpp)
diff --git a/unittest/storage/column_store/test_cg_bitmap.cpp b/unittest/storage/column_store/test_cg_bitmap.cpp
new file mode 100644
index 0000000000..ab40bd7902
--- /dev/null
+++ b/unittest/storage/column_store/test_cg_bitmap.cpp
@@ -0,0 +1,152 @@
+/**
+ * Copyright (c) 2022 OceanBase
+ * OceanBase is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#define USING_LOG_PREFIX STORAGE
+#include <gtest/gtest.h>
+#include <gmock/gmock.h>
+
+#define private public
+#define protected public
+
+#include <chrono>
+#define private public
+#define OK(ass) ASSERT_EQ(OB_SUCCESS, (ass))
+#include "common/ob_target_specific.h"
+#include "lib/container/ob_bitmap.h"
+#include "lib/allocator/page_arena.h"
+#include "storage/ob_storage_struct.h"
+#include "storage/column_store/ob_cg_bitmap.h"
+
+
+namespace oceanbase
+{
+using namespace common;
+using namespace storage;
+using namespace blocksstable;
+using namespace share;
+
+namespace unittest
+{
+
+class TestCGBitmap: public ::testing::Test
+{
+public:
+  TestCGBitmap();
+  ~TestCGBitmap() = default;
+public:
+  virtual void SetUp() {};
+  virtual void TearDown() {};
+  static void SetUpTestCase()
+  {
+    LOG_INFO("Supported cpu instructions",
+             K(common::is_arch_supported(ObTargetArch::Default)),
+             K(common::is_arch_supported(ObTargetArch::SSE42)),
+             K(common::is_arch_supported(ObTargetArch::AVX)),
+             K(common::is_arch_supported(ObTargetArch::AVX2)),
+             K(common::is_arch_supported(ObTargetArch::AVX512)));
+  }
+  static void TearDownTestCase() {};
+public:
+  ModulePageAllocator allocator_;
+};
+
+TestCGBitmap::TestCGBitmap()
+  : allocator_()
+{
+}
+
+TEST_F(TestCGBitmap, test_constant)
+{
+  ObCGBitmap bitmap(allocator_);
+  bitmap.init(1000, false);
+  ASSERT_EQ(false, bitmap.get_filter_constant_type().is_constant());
+
+  bitmap.reuse(0);
+  ASSERT_EQ(false, bitmap.is_all_true());
+
+  sql::ObBoolMask bmt;
+  bmt.set_always_false();
+  bitmap.set_constant_filter_info(bmt, 0);
+  ASSERT_EQ(true, bitmap.is_all_false());
+
+  bmt.set_always_true();
+  bitmap.set_constant_filter_info(bmt, 0);
+  ASSERT_EQ(true, bitmap.is_all_true());
+
+  bitmap.bit_not();
+  ASSERT_EQ(false, bitmap.is_all_true());
+}
+
+TEST_F(TestCGBitmap, set_batch)
+{
+  ObCGBitmap bitmap(allocator_);
+  bitmap.init(1000, false);
+  ASSERT_EQ(false, bitmap.get_filter_constant_type().is_constant());
+
+  bitmap.reuse(0, true);
+  ASSERT_EQ(true, bitmap.is_all_true());
+
+  ObCSRange cs_range(0, 200);
+  bitmap.set_bitmap_batch(cs_range.start_row_id_, cs_range.end_row_id_, 0);
+  ASSERT_EQ(false, bitmap.is_all_true());
+  ASSERT_EQ(true, bitmap.get_filter_constant_type().is_uncertain());
+  ASSERT_EQ(true, bitmap.is_all_false(cs_range));
+}
+
+TEST_F(TestCGBitmap, copy_from)
+{
+  ObCGBitmap bitmap1(allocator_);
+  bitmap1.init(1000, false);
+  ASSERT_EQ(false, bitmap1.get_filter_constant_type().is_constant());
+
+  ModulePageAllocator allocator2_;
+  ObCGBitmap bitmap2(allocator2_);
+  bitmap2.init(500, false);
+  ASSERT_EQ(false, bitmap2.get_filter_constant_type().is_constant());
+
+  bitmap1.reuse(0, true);
+  ASSERT_EQ(true, bitmap1.is_all_true());
+
+  bitmap2.reuse(0);
+  ASSERT_EQ(true, bitmap2.is_all_false());
+
+  bitmap1.copy_from(bitmap2);
+  ASSERT_EQ(true, bitmap1.is_all_false());
+  ASSERT_EQ(500, bitmap1.size());
+
+  sql::ObBoolMask bmt;
+  bmt.set_always_true();
+  bitmap2.set_constant_filter_info(bmt, 0);
+  ASSERT_EQ(true, bitmap2.is_all_true());
+
+  bitmap1.copy_from(bitmap2);
+  ASSERT_EQ(true, bitmap1.is_all_true());
+  ASSERT_EQ(500, bitmap1.size());
+
+  bitmap2.set_filter_uncertain();
+  bitmap1.copy_from(bitmap2);
+  ASSERT_EQ(false, bitmap1.get_filter_constant_type().is_constant());
+}
+
+} //namespace unittest
+} //namespace oceanbase
+
+
+int main(int argc, char **argv)
+{
+  system("rm -rf test_cg_bitmap.log");
+  OB_LOGGER.set_file_name("test_cg_bitmap.log", true);
+  OB_LOGGER.set_log_level("INFO");
+  CLOG_LOG(INFO, "begin unittest: test_cg_bitmap");
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}
diff --git a/unittest/storage/column_store/test_co_sstable.cpp b/unittest/storage/column_store/test_co_sstable.cpp
index 2c879c6587..ba913b4098 100644
--- a/unittest/storage/column_store/test_co_sstable.cpp
+++ b/unittest/storage/column_store/test_co_sstable.cpp
@@ -478,7 +478,7 @@ int main(int argc, char **argv)
 {
   system("rm -rf test_co_sstable.log");
   OB_LOGGER.set_file_name("test_co_sstable.log", true);
-  OB_LOGGER.set_log_level("DEBUG");
+  OB_LOGGER.set_log_level("INFO");
   CLOG_LOG(INFO, "begin unittest: test_co_sstable");
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();