Ensure worker_save_query_explain_analyze always fully qualifies types (#5776)

Co-authored-by: Onur Tirtir <onurcantirtir@gmail.com>
Co-authored-by: Marco Slot <marco.slot@gmail.com>

src/backend/distributed/planner/multi_explain.c

@@ -1418,7 +1418,9 @@ WrapQueryForExplainAnalyze(const char *queryString, TupleDesc tupleDesc)
 		}
 
 		Form_pg_attribute attr = &tupleDesc->attrs[columnIndex];
-		char *attrType = format_type_with_typemod(attr->atttypid, attr->atttypmod);
+		char *attrType = format_type_extended(attr->atttypid, attr->atttypmod,
+											  FORMAT_TYPE_TYPEMOD_GIVEN |
+											  FORMAT_TYPE_FORCE_QUALIFY);
 
 		appendStringInfo(columnDef, "field_%d %s", columnIndex, attrType);
 	}

src/test/regress/expected/multi_explain.out

@@ -3043,5 +3043,18 @@ Custom Scan (Citus Adaptive) (actual rows=1 loops=1)
   ->  Task
         Node: host=localhost port=xxxxx dbname=regression
         ->  Seq Scan on distributed_table_1_570032 distributed_table_xxx (actual rows=1 loops=1)
+CREATE TYPE multi_explain.int_wrapper_type AS (int_field int);
+CREATE TABLE tbl (a int, b multi_explain.int_wrapper_type);
+SELECT create_distributed_table('tbl', 'a');
+
+EXPLAIN :default_analyze_flags SELECT * FROM tbl;
+Custom Scan (Citus Adaptive) (actual rows=0 loops=1)
+  Task Count: 2
+  Tuple data received from nodes: 0 bytes
+  Tasks Shown: One of 2
+  ->  Task
+        Tuple data received from node: 0 bytes
+        Node: host=localhost port=xxxxx dbname=regression
+        ->  Seq Scan on tbl_570036 tbl (actual rows=0 loops=1)
 SET client_min_messages TO ERROR;
 DROP SCHEMA multi_explain CASCADE;

src/test/regress/sql/multi_explain.sql

@@ -1084,5 +1084,11 @@ EXPLAIN :default_analyze_flags SELECT FROM (SELECT * FROM reference_table) subqu
 PREPARE dummy_prep_stmt(int) AS SELECT FROM distributed_table_1;
 EXPLAIN :default_analyze_flags EXECUTE dummy_prep_stmt(50);
 
+CREATE TYPE multi_explain.int_wrapper_type AS (int_field int);
+CREATE TABLE tbl (a int, b multi_explain.int_wrapper_type);
+SELECT create_distributed_table('tbl', 'a');
+
+EXPLAIN :default_analyze_flags SELECT * FROM tbl;
+
 SET client_min_messages TO ERROR;
 DROP SCHEMA multi_explain CASCADE;