diff --git a/fe/fe-core/src/test/java/org/apache/doris/planner/QueryPlanTest.java b/fe/fe-core/src/test/java/org/apache/doris/planner/QueryPlanTest.java
index beb7b506de239f..06c8da2dd9ffb7 100644
--- a/fe/fe-core/src/test/java/org/apache/doris/planner/QueryPlanTest.java
+++ b/fe/fe-core/src/test/java/org/apache/doris/planner/QueryPlanTest.java
@@ -17,7 +17,6 @@
 
 package org.apache.doris.planner;
 
-import com.google.common.collect.Lists;
 import org.apache.doris.analysis.CreateDbStmt;
 import org.apache.doris.analysis.CreateTableStmt;
 import org.apache.doris.analysis.DropDbStmt;
@@ -41,6 +40,8 @@
 import org.apache.doris.qe.QueryState.MysqlStateType;
 import org.apache.doris.utframe.UtFrameUtils;
 
+import com.google.common.collect.Lists;
+
 import org.apache.commons.lang3.StringUtils;
 import org.junit.AfterClass;
 import org.junit.Assert;
@@ -136,7 +137,8 @@ public static void beforeClass() throws Exception {
 
         createTable("CREATE TABLE test.bitmap_table_2 (\n" +
                 "  `id` int(11) NULL COMMENT \"\",\n" +
-                "  `id2` bitmap bitmap_union NULL\n" +
+                "  `id2` bitmap bitmap_union NULL,\n" +
+                "  `id3` bitmap bitmap_union NULL\n" +
                 ") ENGINE=OLAP\n" +
                 "AGGREGATE KEY(`id`)\n" +
                 "DISTRIBUTED BY HASH(`id`) BUCKETS 1\n" +
@@ -530,6 +532,18 @@ public void testCountDistinctRewrite() throws Exception {
         explainString = UtFrameUtils.getSQLPlanOrErrorMsg(connectContext, "explain " + sql);
         Assert.assertTrue(explainString.contains("bitmap_union_count"));
 
+        sql = "select count(distinct if(id = 1, id2, null)) from test.bitmap_table";
+        explainString = UtFrameUtils.getSQLPlanOrErrorMsg(connectContext, "explain " + sql);
+        Assert.assertTrue(explainString.contains("bitmap_union_count"));
+
+        sql = "select count(distinct ifnull(id2, id3)) from test.bitmap_table_2";
+        explainString = UtFrameUtils.getSQLPlanOrErrorMsg(connectContext, "explain " + sql);
+        Assert.assertTrue(explainString.contains("bitmap_union_count"));
+
+        sql = "select count(distinct coalesce(id2, id3)) from test.bitmap_table_2";
+        explainString = UtFrameUtils.getSQLPlanOrErrorMsg(connectContext, "explain " + sql);
+        Assert.assertTrue(explainString.contains("bitmap_union_count"));
+
         ConnectContext.get().getSessionVariable().setRewriteCountDistinct(false);
         sql = "select count(distinct id2) from test.bitmap_table";
         explainString = UtFrameUtils.getSQLPlanOrErrorMsg(connectContext, "explain " + sql);
diff --git a/gensrc/script/doris_builtins_functions.py b/gensrc/script/doris_builtins_functions.py
index b5b9c0e17a1c11..7b6d60fba94a12 100755
--- a/gensrc/script/doris_builtins_functions.py
+++ b/gensrc/script/doris_builtins_functions.py
@@ -461,6 +461,7 @@
     [['if'], 'DATE', ['BOOLEAN', 'DATE', 'DATE'], ''],
     [['if'], 'DECIMAL', ['BOOLEAN', 'DECIMAL', 'DECIMAL'], ''],
     [['if'], 'DECIMALV2', ['BOOLEAN', 'DECIMALV2', 'DECIMALV2'], ''],
+    [['if'], 'BITMAP', ['BOOLEAN', 'BITMAP', 'BITMAP'], ''],
     # The priority of varchar should be lower than decimal in IS_SUPERTYPE_OF mode.
     [['if'], 'VARCHAR', ['BOOLEAN', 'VARCHAR', 'VARCHAR'], ''],
 
@@ -493,6 +494,7 @@
     [['ifnull'], 'DATETIME', ['DATETIME', 'DATE'], ''],
     [['ifnull'], 'DECIMAL', ['DECIMAL', 'DECIMAL'], ''],
     [['ifnull'], 'DECIMALV2', ['DECIMALV2', 'DECIMALV2'], ''],
+    [['ifnull'], 'BITMAP', ['BITMAP', 'BITMAP'], ''],
     # The priority of varchar should be lower than decimal in IS_SUPERTYPE_OF mode.
     [['ifnull'], 'VARCHAR', ['VARCHAR', 'VARCHAR'], ''],
 
@@ -508,6 +510,7 @@
     [['coalesce'], 'DATE', ['DATE', '...'], ''],
     [['coalesce'], 'DECIMAL', ['DECIMAL', '...'], ''],
     [['coalesce'], 'DECIMALV2', ['DECIMALV2', '...'], ''],
+    [['coalesce'], 'BITMAP', ['BITMAP', '...'], ''],
     # The priority of varchar should be lower than decimal in IS_SUPERTYPE_OF mode.
     [['coalesce'], 'VARCHAR', ['VARCHAR', '...'], ''],