Make more use of castNode()

14 files changed, 59 insertions, 95 deletions

diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index eeacf815e35..633b5c1608d 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -2382,8 +2382,8 @@ subquery_is_pushdown_safe(Query *subquery, Query *topquery,
 		if (subquery->setOperations != NULL)
 			return false;
 		/* Check whether setop component output types match top level */
-		topop = (SetOperationStmt *) topquery->setOperations;
-		Assert(topop && IsA(topop, SetOperationStmt));
+		topop = castNode(SetOperationStmt, topquery->setOperations);
+		Assert(topop);
 		compare_tlist_datatypes(subquery->targetList,
 								topop->colTypes,
 								safetyInfo);
diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c
index d01630f8dba..c138f57ebb4 100644
--- a/src/backend/optimizer/path/costsize.c
+++ b/src/backend/optimizer/path/costsize.c
@@ -682,9 +682,8 @@ extract_nonindex_conditions(List *qual_clauses, List *indexquals)
 
 	foreach(lc, qual_clauses)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(lc));
 
-		Assert(IsA(rinfo, RestrictInfo));
 		if (rinfo->pseudoconstant)
 			continue;			/* we may drop pseudoconstants here */
 		if (list_member_ptr(indexquals, rinfo))
@@ -1804,12 +1803,10 @@ cost_windowagg(Path *path, PlannerInfo *root,
 	 */
 	foreach(lc, windowFuncs)
 	{
-		WindowFunc *wfunc = (WindowFunc *) lfirst(lc);
+		WindowFunc *wfunc = castNode(WindowFunc, lfirst(lc));
 		Cost		wfunccost;
 		QualCost	argcosts;
 
-		Assert(IsA(wfunc, WindowFunc));
-
 		wfunccost = get_func_cost(wfunc->winfnoid) * cpu_operator_cost;
 
 		/* also add the input expressions' cost to per-input-row costs */
@@ -2843,11 +2840,9 @@ final_cost_hashjoin(PlannerInfo *root, HashPath *path,
 		innerbucketsize = 1.0;
 		foreach(hcl, hashclauses)
 		{
-			RestrictInfo *restrictinfo = (RestrictInfo *) lfirst(hcl);
+			RestrictInfo *restrictinfo = castNode(RestrictInfo, lfirst(hcl));
 			Selectivity thisbucketsize;
 
-			Assert(IsA(restrictinfo, RestrictInfo));
-
 			/*
 			 * First we have to figure out which side of the hashjoin clause
 			 * is the inner side.
@@ -3537,9 +3532,8 @@ compute_semi_anti_join_factors(PlannerInfo *root,
 		joinquals = NIL;
 		foreach(l, restrictlist)
 		{
-			RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
+			RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(l));
 
-			Assert(IsA(rinfo, RestrictInfo));
 			if (!rinfo->is_pushed_down)
 				joinquals = lappend(joinquals, rinfo);
 		}
@@ -3970,9 +3964,8 @@ calc_joinrel_size_estimate(PlannerInfo *root,
 		/* Grovel through the clauses to separate into two lists */
 		foreach(l, restrictlist)
 		{
-			RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
+			RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(l));
 
-			Assert(IsA(rinfo, RestrictInfo));
 			if (rinfo->is_pushed_down)
 				pushedquals = lappend(pushedquals, rinfo);
 			else
@@ -4345,11 +4338,10 @@ set_subquery_size_estimates(PlannerInfo *root, RelOptInfo *rel)
 	 */
 	foreach(lc, subroot->parse->targetList)
 	{
-		TargetEntry *te = (TargetEntry *) lfirst(lc);
+		TargetEntry *te = castNode(TargetEntry, lfirst(lc));
 		Node	   *texpr = (Node *) te->expr;
 		int32		item_width = 0;
 
-		Assert(IsA(te, TargetEntry));
 		/* junk columns aren't visible to upper query */
 		if (te->resjunk)
 			continue;
diff --git a/src/backend/optimizer/path/indxpath.c b/src/backend/optimizer/path/indxpath.c
index d92826bcfc9..9c069983d91 100644
--- a/src/backend/optimizer/path/indxpath.c
+++ b/src/backend/optimizer/path/indxpath.c
@@ -1273,12 +1273,11 @@ generate_bitmap_or_paths(PlannerInfo *root, RelOptInfo *rel,
 
 	foreach(lc, clauses)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(lc));
 		List	   *pathlist;
 		Path	   *bitmapqual;
 		ListCell   *j;
 
-		Assert(IsA(rinfo, RestrictInfo));
 		/* Ignore RestrictInfos that aren't ORs */
 		if (!restriction_is_or_clause(rinfo))
 			continue;
@@ -1310,10 +1309,10 @@ generate_bitmap_or_paths(PlannerInfo *root, RelOptInfo *rel,
 			}
 			else
 			{
+				RestrictInfo *rinfo = castNode(RestrictInfo, orarg);
 				List	   *orargs;
 
-				Assert(IsA(orarg, RestrictInfo));
-				Assert(!restriction_is_or_clause((RestrictInfo *) orarg));
+				Assert(!restriction_is_or_clause(rinfo));
 				orargs = list_make1(orarg);
 
 				indlist = build_paths_for_OR(root, rel,
@@ -2174,9 +2173,8 @@ match_clauses_to_index(IndexOptInfo *index,
 
 	foreach(lc, clauses)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(lc));
 
-		Assert(IsA(rinfo, RestrictInfo));
 		match_clause_to_index(index, rinfo, clauseset);
 	}
 }
diff --git a/src/backend/optimizer/path/joinrels.c b/src/backend/optimizer/path/joinrels.c
index 6f3c20b33ff..0d0068360c1 100644
--- a/src/backend/optimizer/path/joinrels.c
+++ b/src/backend/optimizer/path/joinrels.c
@@ -1230,9 +1230,8 @@ restriction_is_constant_false(List *restrictlist, bool only_pushed_down)
 	 */
 	foreach(lc, restrictlist)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(lc));
 
-		Assert(IsA(rinfo, RestrictInfo));
 		if (only_pushed_down && !rinfo->is_pushed_down)
 			continue;
 
diff --git a/src/backend/optimizer/plan/analyzejoins.c b/src/backend/optimizer/plan/analyzejoins.c
index 438baf1e61f..ac63f7572b6 100644
--- a/src/backend/optimizer/plan/analyzejoins.c
+++ b/src/backend/optimizer/plan/analyzejoins.c
@@ -596,7 +596,7 @@ rel_is_distinct_for(PlannerInfo *root, RelOptInfo *rel, List *clause_list)
 		 */
 		foreach(l, clause_list)
 		{
-			RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
+			RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(l));
 			Oid			op;
 			Var		   *var;
 
@@ -608,8 +608,7 @@ rel_is_distinct_for(PlannerInfo *root, RelOptInfo *rel, List *clause_list)
 			 * caller's mergejoinability test should have selected only
 			 * OpExprs.
 			 */
-			Assert(IsA(rinfo->clause, OpExpr));
-			op = ((OpExpr *) rinfo->clause)->opno;
+			op = castNode(OpExpr, rinfo->clause)->opno;
 
 			/* caller identified the inner side for us */
 			if (rinfo->outer_is_left)
@@ -782,9 +781,8 @@ query_is_distinct_for(Query *query, List *colnos, List *opids)
 	 */
 	if (query->setOperations)
 	{
-		SetOperationStmt *topop = (SetOperationStmt *) query->setOperations;
+		SetOperationStmt *topop = castNode(SetOperationStmt, query->setOperations);
 
-		Assert(IsA(topop, SetOperationStmt));
 		Assert(topop->op != SETOP_NONE);
 
 		if (!topop->all)
diff --git a/src/backend/optimizer/plan/createplan.c b/src/backend/optimizer/plan/createplan.c
index 997bdcff2ea..1e953b40d6f 100644
--- a/src/backend/optimizer/plan/createplan.c
+++ b/src/backend/optimizer/plan/createplan.c
@@ -508,8 +508,7 @@ create_scan_plan(PlannerInfo *root, Path *best_path, int flags)
 	{
 		case T_IndexScan:
 		case T_IndexOnlyScan:
-			Assert(IsA(best_path, IndexPath));
-			scan_clauses = ((IndexPath *) best_path)->indexinfo->indrestrictinfo;
+			scan_clauses = castNode(IndexPath, best_path)->indexinfo->indrestrictinfo;
 			break;
 		default:
 			scan_clauses = rel->baserestrictinfo;
@@ -2450,9 +2449,8 @@ create_indexscan_plan(PlannerInfo *root,
 	qpqual = NIL;
 	foreach(l, scan_clauses)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(l));
 
-		Assert(IsA(rinfo, RestrictInfo));
 		if (rinfo->pseudoconstant)
 			continue;			/* we may drop pseudoconstants here */
 		if (list_member_ptr(indexquals, rinfo))
@@ -2608,10 +2606,9 @@ create_bitmap_scan_plan(PlannerInfo *root,
 	qpqual = NIL;
 	foreach(l, scan_clauses)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(l));
 		Node	   *clause = (Node *) rinfo->clause;
 
-		Assert(IsA(rinfo, RestrictInfo));
 		if (rinfo->pseudoconstant)
 			continue;			/* we may drop pseudoconstants here */
 		if (list_member(indexquals, clause))
@@ -2820,9 +2817,9 @@ create_bitmap_subplan(PlannerInfo *root, Path *bitmapqual,
 		ListCell   *l;
 
 		/* Use the regular indexscan plan build machinery... */
-		iscan = (IndexScan *) create_indexscan_plan(root, ipath,
-													NIL, NIL, false);
-		Assert(IsA(iscan, IndexScan));
+		iscan = castNode(IndexScan,
+						 create_indexscan_plan(root, ipath,
+											   NIL, NIL, false));
 		/* then convert to a bitmap indexscan */
 		plan = (Plan *) make_bitmap_indexscan(iscan->scan.scanrelid,
 											  iscan->indexid,
@@ -3391,13 +3388,13 @@ create_customscan_plan(PlannerInfo *root, CustomPath *best_path,
 	 * Invoke custom plan provider to create the Plan node represented by the
 	 * CustomPath.
 	 */
-	cplan = (CustomScan *) best_path->methods->PlanCustomPath(root,
-															  rel,
-															  best_path,
-															  tlist,
-															  scan_clauses,
-															  custom_plans);
-	Assert(IsA(cplan, CustomScan));
+	cplan = castNode(CustomScan,
+					 best_path->methods->PlanCustomPath(root,
+														rel,
+														best_path,
+														tlist,
+														scan_clauses,
+														custom_plans));
 
 	/*
 	 * Copy cost data from Path to Plan; no need to make custom-plan providers
@@ -3683,7 +3680,7 @@ create_mergejoin_plan(PlannerInfo *root,
 	i = 0;
 	foreach(lc, best_path->path_mergeclauses)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(lc));
 		EquivalenceClass *oeclass;
 		EquivalenceClass *ieclass;
 		PathKey    *opathkey;
@@ -3693,7 +3690,6 @@ create_mergejoin_plan(PlannerInfo *root,
 		ListCell   *l2;
 
 		/* fetch outer/inner eclass from mergeclause */
-		Assert(IsA(rinfo, RestrictInfo));
 		if (rinfo->outer_is_left)
 		{
 			oeclass = rinfo->left_ec;
@@ -4228,12 +4224,10 @@ fix_indexqual_references(PlannerInfo *root, IndexPath *index_path)
 
 	forboth(lcc, index_path->indexquals, lci, index_path->indexqualcols)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(lcc);
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(lcc));
 		int			indexcol = lfirst_int(lci);
 		Node	   *clause;
 
-		Assert(IsA(rinfo, RestrictInfo));
-
 		/*
 		 * Replace any outer-relation variables with nestloop params.
 		 *
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 3d33d469713..ca0ae7883e7 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -3963,9 +3963,8 @@ create_one_window_path(PlannerInfo *root,
 			window_target = copy_pathtarget(window_target);
 			foreach(lc2, wflists->windowFuncs[wc->winref])
 			{
-				WindowFunc *wfunc = (WindowFunc *) lfirst(lc2);
+				WindowFunc *wfunc = castNode(WindowFunc, lfirst(lc2));
 
-				Assert(IsA(wfunc, WindowFunc));
 				add_column_to_pathtarget(window_target, (Expr *) wfunc, 0);
 				window_target->width += get_typavgwidth(wfunc->wintype, -1);
 			}
diff --git a/src/backend/optimizer/plan/setrefs.c b/src/backend/optimizer/plan/setrefs.c
index be267b9da74..07ddbcf37e9 100644
--- a/src/backend/optimizer/plan/setrefs.c
+++ b/src/backend/optimizer/plan/setrefs.c
@@ -224,11 +224,9 @@ set_plan_references(PlannerInfo *root, Plan *plan)
 	 */
 	foreach(lc, root->rowMarks)
 	{
-		PlanRowMark *rc = (PlanRowMark *) lfirst(lc);
+		PlanRowMark *rc = castNode(PlanRowMark, lfirst(lc));
 		PlanRowMark *newrc;
 
-		Assert(IsA(rc, PlanRowMark));
-
 		/* flat copy is enough since all fields are scalars */
 		newrc = (PlanRowMark *) palloc(sizeof(PlanRowMark));
 		memcpy(newrc, rc, sizeof(PlanRowMark));
diff --git a/src/backend/optimizer/plan/subselect.c b/src/backend/optimizer/plan/subselect.c
index 7954c445dd9..3eb2bb749e4 100644
--- a/src/backend/optimizer/plan/subselect.c
+++ b/src/backend/optimizer/plan/subselect.c
@@ -433,9 +433,8 @@ get_first_col_type(Plan *plan, Oid *coltype, int32 *coltypmod,
 	/* In cases such as EXISTS, tlist might be empty; arbitrarily use VOID */
 	if (plan->targetlist)
 	{
-		TargetEntry *tent = (TargetEntry *) linitial(plan->targetlist);
+		TargetEntry *tent = castNode(TargetEntry, linitial(plan->targetlist));
 
-		Assert(IsA(tent, TargetEntry));
 		if (!tent->resjunk)
 		{
 			*coltype = exprType((Node *) tent->expr);
@@ -601,14 +600,14 @@ make_subplan(PlannerInfo *root, Query *orig_subquery,
 				AlternativeSubPlan *asplan;
 
 				/* OK, convert to SubPlan format. */
-				hashplan = (SubPlan *) build_subplan(root, plan, subroot,
-													 plan_params,
-													 ANY_SUBLINK, 0,
-													 newtestexpr,
-													 false, true,
-												   best_path->parallel_safe);
+				hashplan = castNode(SubPlan,
+									build_subplan(root, plan, subroot,
+												  plan_params,
+												  ANY_SUBLINK, 0,
+												  newtestexpr,
+												  false, true,
+												  best_path->parallel_safe));
 				/* Check we got what we expected */
-				Assert(IsA(hashplan, SubPlan));
 				Assert(hashplan->parParam == NIL);
 				Assert(hashplan->useHashTable);
 				/* build_subplan won't have filled in paramIds */
diff --git a/src/backend/optimizer/prep/prepjointree.c b/src/backend/optimizer/prep/prepjointree.c
index 6911177b68a..6c6ac8dc0aa 100644
--- a/src/backend/optimizer/prep/prepjointree.c
+++ b/src/backend/optimizer/prep/prepjointree.c
@@ -1748,10 +1748,9 @@ is_simple_union_all(Query *subquery)
 		elog(ERROR, "subquery is bogus");
 
 	/* Is it a set-operation query at all? */
-	topop = (SetOperationStmt *) subquery->setOperations;
+	topop = castNode(SetOperationStmt, subquery->setOperations);
 	if (!topop)
 		return false;
-	Assert(IsA(topop, SetOperationStmt));
 
 	/* Can't handle ORDER BY, LIMIT/OFFSET, locking, or WITH */
 	if (subquery->sortClause ||
@@ -2323,8 +2322,8 @@ flatten_simple_union_all(PlannerInfo *root)
 	RangeTblRef *rtr;
 
 	/* Shouldn't be called unless query has setops */
-	topop = (SetOperationStmt *) parse->setOperations;
-	Assert(topop && IsA(topop, SetOperationStmt));
+	topop = castNode(SetOperationStmt, parse->setOperations);
+	Assert(topop);
 
 	/* Can't optimize away a recursive UNION */
 	if (root->hasRecursion)
diff --git a/src/backend/optimizer/prep/prepunion.c b/src/backend/optimizer/prep/prepunion.c
index 06e843dff07..1389db18ba2 100644
--- a/src/backend/optimizer/prep/prepunion.c
+++ b/src/backend/optimizer/prep/prepunion.c
@@ -129,7 +129,7 @@ RelOptInfo *
 plan_set_operations(PlannerInfo *root)
 {
 	Query	   *parse = root->parse;
-	SetOperationStmt *topop = (SetOperationStmt *) parse->setOperations;
+	SetOperationStmt *topop = castNode(SetOperationStmt, parse->setOperations);
 	Node	   *node;
 	RangeTblEntry *leftmostRTE;
 	Query	   *leftmostQuery;
@@ -137,7 +137,7 @@ plan_set_operations(PlannerInfo *root)
 	Path	   *path;
 	List	   *top_tlist;
 
-	Assert(topop && IsA(topop, SetOperationStmt));
+	Assert(topop);
 
 	/* check for unsupported stuff */
 	Assert(parse->jointree->fromlist == NIL);
@@ -1701,12 +1701,11 @@ translate_col_privs(const Bitmapset *parent_privs,
 	attno = InvalidAttrNumber;
 	foreach(lc, translated_vars)
 	{
-		Var		   *var = (Var *) lfirst(lc);
+		Var		   *var = castNode(Var, lfirst(lc));
 
 		attno++;
 		if (var == NULL)		/* ignore dropped columns */
 			continue;
-		Assert(IsA(var, Var));
 		if (whole_row ||
 			bms_is_member(attno - FirstLowInvalidHeapAttributeNumber,
 						  parent_privs))
diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c
index 3dedee6d699..b19380e1b1e 100644
--- a/src/backend/optimizer/util/clauses.c
+++ b/src/backend/optimizer/util/clauses.c
@@ -2700,9 +2700,8 @@ eval_const_expressions_mutator(Node *node,
 						 * Since the underlying operator is "=", must negate
 						 * its result
 						 */
-						Const	   *csimple = (Const *) simple;
+						Const	   *csimple = castNode(Const, simple);
 
-						Assert(IsA(csimple, Const));
 						csimple->constvalue =
 							BoolGetDatum(!DatumGetBool(csimple->constvalue));
 						return (Node *) csimple;
@@ -3091,12 +3090,10 @@ eval_const_expressions_mutator(Node *node,
 				const_true_cond = false;
 				foreach(arg, caseexpr->args)
 				{
-					CaseWhen   *oldcasewhen = (CaseWhen *) lfirst(arg);
+					CaseWhen   *oldcasewhen = castNode(CaseWhen, lfirst(arg));
 					Node	   *casecond;
 					Node	   *caseresult;
 
-					Assert(IsA(oldcasewhen, CaseWhen));
-
 					/* Simplify this alternative's test condition */
 					casecond = eval_const_expressions_mutator((Node *) oldcasewhen->expr,
 															  context);
@@ -4081,8 +4078,7 @@ fetch_function_defaults(HeapTuple func_tuple)
 	if (isnull)
 		elog(ERROR, "not enough default arguments");
 	str = TextDatumGetCString(proargdefaults);
-	defaults = (List *) stringToNode(str);
-	Assert(IsA(defaults, List));
+	defaults = castNode(List, stringToNode(str));
 	pfree(str);
 	return defaults;
 }
diff --git a/src/backend/optimizer/util/orclauses.c b/src/backend/optimizer/util/orclauses.c
index c965bb678d3..9cbcaedb75d 100644
--- a/src/backend/optimizer/util/orclauses.c
+++ b/src/backend/optimizer/util/orclauses.c
@@ -188,9 +188,8 @@ extract_or_clause(RestrictInfo *or_rinfo, RelOptInfo *rel)
 
 			foreach(lc2, andargs)
 			{
-				RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc2);
+				RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(lc2));
 
-				Assert(IsA(rinfo, RestrictInfo));
 				if (restriction_is_or_clause(rinfo))
 				{
 					/*
@@ -211,11 +210,11 @@ extract_or_clause(RestrictInfo *or_rinfo, RelOptInfo *rel)
 		}
 		else
 		{
-			Assert(IsA(orarg, RestrictInfo));
-			Assert(!restriction_is_or_clause((RestrictInfo *) orarg));
-			if (is_safe_restriction_clause_for((RestrictInfo *) orarg, rel))
-				subclauses = lappend(subclauses,
-									 ((RestrictInfo *) orarg)->clause);
+			RestrictInfo *rinfo = castNode(RestrictInfo, orarg);
+
+			Assert(!restriction_is_or_clause(rinfo));
+			if (is_safe_restriction_clause_for(rinfo, rel))
+				subclauses = lappend(subclauses, rinfo->clause);
 		}
 
 		/*
diff --git a/src/backend/optimizer/util/restrictinfo.c b/src/backend/optimizer/util/restrictinfo.c
index 045b5cf5392..6f79f966544 100644
--- a/src/backend/optimizer/util/restrictinfo.c
+++ b/src/backend/optimizer/util/restrictinfo.c
@@ -335,9 +335,7 @@ get_actual_clauses(List *restrictinfo_list)
 
 	foreach(l, restrictinfo_list)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
-
-		Assert(IsA(rinfo, RestrictInfo));
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(l));
 
 		Assert(!rinfo->pseudoconstant);
 
@@ -361,9 +359,7 @@ extract_actual_clauses(List *restrictinfo_list,
 
 	foreach(l, restrictinfo_list)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
-
-		Assert(IsA(rinfo, RestrictInfo));
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(l));
 
 		if (rinfo->pseudoconstant == pseudoconstant)
 			result = lappend(result, rinfo->clause);
@@ -393,9 +389,7 @@ extract_actual_join_clauses(List *restrictinfo_list,
 
 	foreach(l, restrictinfo_list)
 	{
-		RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
-
-		Assert(IsA(rinfo, RestrictInfo));
+		RestrictInfo *rinfo = castNode(RestrictInfo, lfirst(l));
 
 		if (rinfo->is_pushed_down)
 		{