diff --git a/regression-test/data/query_p0/sql_functions/conditional_functions/test_if.out b/regression-test/data/query_p0/sql_functions/conditional_functions/test_if.out
index 832f69157d4907..d5ceb465b232be 100644
--- a/regression-test/data/query_p0/sql_functions/conditional_functions/test_if.out
+++ b/regression-test/data/query_p0/sql_functions/conditional_functions/test_if.out
@@ -11,3 +11,14 @@
 -- !select --
 []
 
+-- !select --
+true	1
+
+-- !select --
+true
+
+-- !select --
+true	1
+
+-- !select --
+true
diff --git a/regression-test/suites/query_p0/sql_functions/conditional_functions/test_if.groovy b/regression-test/suites/query_p0/sql_functions/conditional_functions/test_if.groovy
index 9a99e8bbd94013..ba0363f4197b2c 100644
--- a/regression-test/suites/query_p0/sql_functions/conditional_functions/test_if.groovy
+++ b/regression-test/suites/query_p0/sql_functions/conditional_functions/test_if.groovy
@@ -21,4 +21,11 @@ suite("test_if") {
     qt_select "select if(job_d is null, array(), job_d) as test from (select array('1970-01-01', '1970-01-01') as job_d) t"
     qt_select "select if(job_d is null, array('1970-01-01'), job_d) as test from (select array('1970-01-01', '1970-01-01') as job_d) t"
     qt_select "select if(job_d is null, job_d, array()) as test from (select array('1970-01-01', '1970-01-01') as job_d) t"
+
+    // user case https://github.com/apache/doris/issues/25644
+    qt_select "SELECT /*+SET_VAR(enable_nereids_planner=true)*/ NOT ISNULL(CASE WHEN IFNULL ((t1.region IN ('US')),0) THEN t1.region ELSE 'other' END) AS account_id, count(*) FROM (select 'US' AS region) as t1 group by 1"
+    qt_select "SELECT /*+SET_VAR(enable_nereids_planner=true)*/ NOT ISNULL(CASE WHEN IFNULL (('US' IN ('US')),0) THEN 'US' ELSE 'other' END);"
+
+    qt_select "SELECT /*+SET_VAR(enable_nereids_planner=false)*/ NOT ISNULL(CASE WHEN IFNULL ((t1.region IN ('US')),0) THEN t1.region ELSE 'other' END) AS account_id, count(*) FROM (select 'US' AS region) as t1 group by 1"
+    qt_select "SELECT /*+SET_VAR(enable_nereids_planner=false)*/ NOT ISNULL(CASE WHEN IFNULL (('US' IN ('US')),0) THEN 'US' ELSE 'other' END);"
 }