add a test

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)
+

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

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');