diff --git a/src/test/regress/expected/function_with_case_when.out b/src/test/regress/expected/function_with_case_when.out
new file mode 100644
index 000000000..e2ea06bc4
--- /dev/null
+++ b/src/test/regress/expected/function_with_case_when.out
@@ -0,0 +1,28 @@
+-- create function
+CREATE OR REPLACE FUNCTION public.test_err(v1 text)
+ RETURNS text
+ LANGUAGE plpgsql
+ SECURITY DEFINER
+AS $function$
+
+begin
+  return v1 || ' - ok';
+END;
+$function$;
+do $$ declare
+ lNewValues text;
+ val text;
+begin
+ val = 'test';
+ lNewValues = public.test_err(v1 => case when val::text = 'test'::text then 'yes' else 'no' end);
+ raise notice 'lNewValues= %', lNewValues;
+end;$$ ;
+NOTICE:  lNewValues= yes - ok
+CONTEXT:  PL/pgSQL function inline_code_block line XX at RAISE
+-- call function
+SELECT public.test_err('test');
+ test_err
+---------------------------------------------------------------------
+ test - ok
+(1 row)
+
diff --git a/src/test/regress/multi_schedule b/src/test/regress/multi_schedule
index 3fec50aac..2de64456c 100644
--- a/src/test/regress/multi_schedule
+++ b/src/test/regress/multi_schedule
@@ -134,3 +134,5 @@ test: check_mx
 test: generated_identity
 test: drop_database
 test: check_cluster_state
+
+test: function_with_case_when
diff --git a/src/test/regress/sql/function_with_case_when.sql b/src/test/regress/sql/function_with_case_when.sql
new file mode 100644
index 000000000..951465444
--- /dev/null
+++ b/src/test/regress/sql/function_with_case_when.sql
@@ -0,0 +1,22 @@
+-- create function
+CREATE OR REPLACE FUNCTION public.test_err(v1 text)
+ RETURNS text
+ LANGUAGE plpgsql
+ SECURITY DEFINER
+AS $function$
+
+begin
+  return v1 || ' - ok';
+END;
+$function$;
+do $$ declare 
+ lNewValues text;
+ val text;
+begin 
+ val = 'test';
+ lNewValues = public.test_err(v1 => case when val::text = 'test'::text then 'yes' else 'no' end);
+ raise notice 'lNewValues= %', lNewValues;
+end;$$ ;
+
+-- call function
+SELECT public.test_err('test');
\ No newline at end of file