add note

Author: okbob

expected/plpgsql_check_active.out

@@ -3675,7 +3675,12 @@ create type tp as (a int, b int);
 create or replace function dyn_sql_2()
 returns void as $$
 declare
-  r tp;
+/*
+ * note: plpgsql doesn't support passing some necessary details for record
+ * type. The parser setup for dynamic SQL column doesn't use ref hooks, and
+ * then it cannot to pass TupleDesc info to query.
+ */
+  r tp; 
   result int;
 begin
   select 10 a, 20 b into r;
@@ -3686,11 +3691,12 @@ begin
 end;
 $$ language plpgsql;
 select * from plpgsql_check_function('dyn_sql_2', security_warnings := true);
-                   plpgsql_check_function                   
-------------------------------------------------------------
- error:42703:9:EXECUTE:column "c" not found in data type tp
+                   plpgsql_check_function                    
+-------------------------------------------------------------
+ error:42703:14:EXECUTE:column "c" not found in data type tp
  Query: select $1.c
  --     ^
 (3 rows)
 
 drop function dyn_sql_2();
+drop type tp;

sql/plpgsql_check_active.sql

@@ -2672,7 +2672,12 @@ create type tp as (a int, b int);
 create or replace function dyn_sql_2()
 returns void as $$
 declare
-  r tp;
+/*
+ * note: plpgsql doesn't support passing some necessary details for record
+ * type. The parser setup for dynamic SQL column doesn't use ref hooks, and
+ * then it cannot to pass TupleDesc info to query.
+ */
+  r tp; 
   result int;
 begin
   select 10 a, 20 b into r;
@@ -2686,3 +2691,5 @@ $$ language plpgsql;
 select * from plpgsql_check_function('dyn_sql_2', security_warnings := true);
 
 drop function dyn_sql_2();
+
+drop type tp;