Attempt to fix parameter passing with auto_explain

src/backend/distributed/planner/multi_explain.c

@@ -808,7 +808,11 @@ FetchRemoteExplainFromWorkers(Task *task, ExplainState *es, ParamListInfo params
 
 		if (params)
 		{
-			ExtractParametersFromParamList(params, &paramTypes, &paramValues, false);
+			/* force evaluation of bound params */
+			params = copyParamList(params);
+
+			ExtractParametersForRemoteExecution(params, &paramTypes,
+												&paramValues);
 		}
 
 		int sendStatus = SendRemoteCommandParams(connection, explainQuery->data,
@@ -1585,15 +1589,6 @@ FetchPlanQueryForExplainAnalyze(const char *queryString, ParamListInfo params)
 {
 	StringInfo fetchQuery = makeStringInfo();
 
-	if (params != NULL)
-	{
-		/*
-		 * Add a dummy CTE to ensure all parameters are referenced, such that their
-		 * types can be resolved.
-		 */
-		appendStringInfo(fetchQuery, "WITH unused AS (%s) ",
-						 ParameterResolutionSubquery(params));
-	}
 
 	appendStringInfoString(fetchQuery,
 						   "SELECT explain_analyze_output, execution_duration "

src/test/regress/sql/multi_explain.sql

@@ -1168,6 +1168,22 @@ set auto_explain.log_analyze to true;
 -- the following should not be locally executed since explain analyze is on
 select * from test_ref_table;
 
+CREATE TABLE test_auto_explain.test_params
+( coll1 int8 NULL,
+  coll2 int4 NOT NULL);
+
+SELECT create_distributed_table('test_auto_explain.test_params', 'coll1');
+
+CREATE OR REPLACE PROCEDURE test_auto_explain.test_delete_from(p_coll2 int)
+LANGUAGE plpgsql
+AS $$
+BEGIN
+DELETE FROM test_auto_explain.test_params
+WHERE coll2 = p_coll2;
+END;$$;
+
+CALL test_auto_explain.test_delete_from(20240401);
+
 DROP SCHEMA test_auto_explain CASCADE;
 
 SET client_min_messages TO ERROR;