diff --git a/fe/fe-common/src/main/java/org/apache/doris/catalog/ScalarType.java b/fe/fe-common/src/main/java/org/apache/doris/catalog/ScalarType.java
index cd635649fd1a68..7b4e4f05814fc2 100644
--- a/fe/fe-common/src/main/java/org/apache/doris/catalog/ScalarType.java
+++ b/fe/fe-common/src/main/java/org/apache/doris/catalog/ScalarType.java
@@ -1124,7 +1124,13 @@ public static ScalarType getAssignmentCompatibleType(
             if (t1.isFloatingPointType() || t2.isFloatingPointType()) {
                 return t1.isFloatingPointType() ? t1 : t2;
             } else if (t1.isBoolean() || t2.isBoolean()) {
-                return t1.isDecimalV3() ? t1 : t2;
+                return t1.isDecimalV3()
+                        ? ScalarType.createDecimalV3Type(
+                        Math.max(t1.precision - t1.scale, 1) + Math.max(t1.scale, 0),
+                        Math.max(t1.scale, 0)) :
+                        ScalarType.createDecimalV3Type(
+                        Math.max(t2.precision - t2.scale, 1) + Math.max(t2.scale, 0),
+                        Math.max(t2.scale, 0));
             }
         }
 
diff --git a/regression-test/data/datatype_p0/scalar_types/get_assignment_compatible_type.out b/regression-test/data/datatype_p0/scalar_types/get_assignment_compatible_type.out
new file mode 100644
index 00000000000000..5706a768d2d000
--- /dev/null
+++ b/regression-test/data/datatype_p0/scalar_types/get_assignment_compatible_type.out
@@ -0,0 +1,8 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !test_sql --
+test_decimal_boolean_view	CREATE VIEW `test_decimal_boolean_view` COMMENT 'VIEW' AS SELECT `id` AS `id`, `c1` AS `c1`, `c2` AS `c2` FROM `default_cluster:regression_test_datatype_p0_scalar_types`.`test_decimal_boolean` WHERE 0.0 = CAST(`c1` AS DECIMALV3(2, 1)) AND CAST(`c2` AS DECIMALV3(6, 1)) = 1.0;	utf8	utf8_general_ci
+
+-- !test_union --
+0.0
+1.0
+
diff --git a/regression-test/suites/datatype_p0/scalar_types/get_assignment_compatible_type.groovy b/regression-test/suites/datatype_p0/scalar_types/get_assignment_compatible_type.groovy
new file mode 100644
index 00000000000000..afbf3746259533
--- /dev/null
+++ b/regression-test/suites/datatype_p0/scalar_types/get_assignment_compatible_type.groovy
@@ -0,0 +1,52 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+suite("get_assignment_compatible_type") {
+    sql 'set enable_nereids_planner=false'
+    sql "drop table if exists test_decimal_boolean"
+    sql """create table test_decimal_boolean (
+        id int,
+        c1 boolean,
+        c2 tinyint
+        ) duplicate key (`id`)
+        DISTRIBUTED BY HASH(`id`) BUCKETS 1
+        PROPERTIES (
+        "replication_allocation" = "tag.location.default: 1",
+        "in_memory" = "false",
+        "storage_format" = "V2"
+        ); """
+    sql "insert into test_decimal_boolean values (1,1,1),(2,0,1);"
+    sql "sync"
+    sql "drop view if exists test_decimal_boolean_view;"
+    // 0.0 = c1 is the test point
+    sql "create view test_decimal_boolean_view as select id,c1,c2 from test_decimal_boolean where 0.0=c1 and c2 = 1.0;"
+    sql "select * from test_decimal_boolean_view;"
+    qt_test_sql "show create view test_decimal_boolean_view"
+
+    sql "drop table if exists test_decimal_boolean_union"
+    sql """create table test_decimal_boolean_union (
+        id int,
+        c1 boolean,
+        c2 decimalv3(1,1)
+        ) duplicate key (`id`)
+        DISTRIBUTED BY HASH(`id`) BUCKETS 1
+        PROPERTIES (
+        "replication_allocation" = "tag.location.default: 1"
+        ); """
+    sql "insert into test_decimal_boolean_union values(1,true,0.0),(1,false,0.0)"
+    qt_test_union "select c1 from test_decimal_boolean_union union select c2 from test_decimal_boolean_union order by 1"
+}
\ No newline at end of file