Make more use of castNode()

src/backend/parser/analyze.c

@@ -824,8 +824,7 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt)
 		AttrNumber	attr_num;
 		TargetEntry *tle;
 
-		col = (ResTarget *) lfirst(icols);
-		Assert(IsA(col, ResTarget));
+		col = castNode(ResTarget, lfirst(icols));
 		attr_num = (AttrNumber) lfirst_int(attnos);
 
 		tle = makeTargetEntry(expr,
@@ -950,8 +949,7 @@ transformInsertRow(ParseState *pstate, List *exprlist,
 		Expr	   *expr = (Expr *) lfirst(lc);
 		ResTarget  *col;
 
-		col = (ResTarget *) lfirst(icols);
-		Assert(IsA(col, ResTarget));
+		col = castNode(ResTarget, lfirst(icols));
 
 		expr = transformAssignedExpr(pstate, expr,
 									 EXPR_KIND_INSERT_TARGET,
@@ -1633,10 +1631,9 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
 	/*
 	 * Recursively transform the components of the tree.
 	 */
-	sostmt = (SetOperationStmt *) transformSetOperationTree(pstate, stmt,
-															true,
-															NULL);
-	Assert(sostmt && IsA(sostmt, SetOperationStmt));
+	sostmt = castNode(SetOperationStmt,
+					  transformSetOperationTree(pstate, stmt, true,	NULL));
+	Assert(sostmt);
 	qry->setOperations = (Node *) sostmt;
 
 	/*
@@ -2298,8 +2295,7 @@ transformUpdateTargetList(ParseState *pstate, List *origTlist)
 		}
 		if (orig_tl == NULL)
 			elog(ERROR, "UPDATE target count mismatch --- internal error");
-		origTarget = (ResTarget *) lfirst(orig_tl);
-		Assert(IsA(origTarget, ResTarget));
+		origTarget = castNode(ResTarget, lfirst(orig_tl));
 
 		attrno = attnameAttNum(pstate->p_target_relation,
 							   origTarget->name, true);

src/backend/parser/gram.y

@@ -3249,8 +3249,7 @@ ColQualList:
 ColConstraint:
 			CONSTRAINT name ColConstraintElem
 				{
-					Constraint *n = (Constraint *) $3;
-					Assert(IsA(n, Constraint));
+					Constraint *n = castNode(Constraint, $3);
 					n->conname = $2;
 					n->location = @1;
 					$$ = (Node *) n;
@@ -3442,8 +3441,7 @@ TableLikeOption:
 TableConstraint:
 			CONSTRAINT name ConstraintElem
 				{
-					Constraint *n = (Constraint *) $3;
-					Assert(IsA(n, Constraint));
+					Constraint *n = castNode(Constraint, $3);
 					n->conname = $2;
 					n->location = @1;
 					$$ = (Node *) n;
@@ -12845,8 +12843,7 @@ c_expr:		columnref								{ $$ = $1; }
 				}
 			| ARRAY array_expr
 				{
-					A_ArrayExpr *n = (A_ArrayExpr *) $2;
-					Assert(IsA(n, A_ArrayExpr));
+					A_ArrayExpr *n = castNode(A_ArrayExpr, $2);
 					/* point outermost A_ArrayExpr to the ARRAY keyword */
 					n->location = @1;
 					$$ = (Node *)n;

src/backend/parser/parse_clause.c

@@ -903,8 +903,7 @@ transformFromClauseItem(ParseState *pstate, Node *n,
 		rel = transformFromClauseItem(pstate, rts->relation,
 									  top_rte, top_rti, namespace);
 		/* Currently, grammar could only return a RangeVar as contained rel */
-		Assert(IsA(rel, RangeTblRef));
-		rtr = (RangeTblRef *) rel;
+		rtr = castNode(RangeTblRef, rel);
 		rte = rt_fetch(rtr->rtindex, pstate->p_rtable);
 		/* We only support this on plain relations and matviews */
 		if (rte->relkind != RELKIND_RELATION &&

src/backend/parser/parse_collate.c

@@ -514,8 +514,7 @@ assign_collations_walker(Node *node, assign_collations_context *context)
 
 				if (qtree->targetList == NIL)
 					return false;
-				tent = (TargetEntry *) linitial(qtree->targetList);
-				Assert(IsA(tent, TargetEntry));
+				tent = castNode(TargetEntry, linitial(qtree->targetList));
 				if (tent->resjunk)
 					return false;
 
@@ -650,9 +649,7 @@ assign_collations_walker(Node *node, assign_collations_context *context)
 
 							foreach(lc, expr->args)
 							{
-								CaseWhen   *when = (CaseWhen *) lfirst(lc);
-
-								Assert(IsA(when, CaseWhen));
+								CaseWhen   *when = castNode(CaseWhen, lfirst(lc));
 
 								/*
 								 * The condition expressions mustn't affect
@@ -868,9 +865,8 @@ assign_aggregate_collations(Aggref *aggref,
 	/* Process aggregated args, holding resjunk ones at arm's length */
 	foreach(lc, aggref->args)
 	{
-		TargetEntry *tle = (TargetEntry *) lfirst(lc);
+		TargetEntry *tle = castNode(TargetEntry, lfirst(lc));
 
-		Assert(IsA(tle, TargetEntry));
 		if (tle->resjunk)
 			assign_expr_collations(loccontext->pstate, (Node *) tle);
 		else
@@ -913,9 +909,8 @@ assign_ordered_set_collations(Aggref *aggref,
 	/* Process aggregated args appropriately */
 	foreach(lc, aggref->args)
 	{
-		TargetEntry *tle = (TargetEntry *) lfirst(lc);
+		TargetEntry *tle = castNode(TargetEntry, lfirst(lc));
 
-		Assert(IsA(tle, TargetEntry));
 		if (merge_sort_collations)
 			(void) assign_collations_walker((Node *) tle, loccontext);
 		else

src/backend/parser/parse_expr.c

@@ -917,13 +917,11 @@ transformAExprOp(ParseState *pstate, A_Expr *a)
 		/* ROW() op ROW() is handled specially */
 		lexpr = transformExprRecurse(pstate, lexpr);
 		rexpr = transformExprRecurse(pstate, rexpr);
-		Assert(IsA(lexpr, RowExpr));
-		Assert(IsA(rexpr, RowExpr));
 
 		result = make_row_comparison_op(pstate,
 										a->name,
-										((RowExpr *) lexpr)->args,
-										((RowExpr *) rexpr)->args,
+										castNode(RowExpr, lexpr)->args,
+										castNode(RowExpr, rexpr)->args,
 										a->location);
 	}
 	else
@@ -1296,8 +1294,7 @@ transformAExprBetween(ParseState *pstate, A_Expr *a)
 
 	/* Deconstruct A_Expr into three subexprs */
 	aexpr = a->lexpr;
-	Assert(IsA(a->rexpr, List));
-	args = (List *) a->rexpr;
+	args = castNode(List, a->rexpr);
 	Assert(list_length(args) == 2);
 	bexpr = (Node *) linitial(args);
 	cexpr = (Node *) lsecond(args);
@@ -1672,12 +1669,10 @@ transformCaseExpr(ParseState *pstate, CaseExpr *c)
 	resultexprs = NIL;
 	foreach(l, c->args)
 	{
-		CaseWhen   *w = (CaseWhen *) lfirst(l);
+		CaseWhen   *w = castNode(CaseWhen, lfirst(l));
 		CaseWhen   *neww = makeNode(CaseWhen);
 		Node	   *warg;
 
-		Assert(IsA(w, CaseWhen));
-
 		warg = (Node *) w->expr;
 		if (placeholder)
 		{
@@ -2339,12 +2334,10 @@ transformXmlExpr(ParseState *pstate, XmlExpr *x)
 
 	foreach(lc, x->named_args)
 	{
-		ResTarget  *r = (ResTarget *) lfirst(lc);
+		ResTarget  *r = castNode(ResTarget, lfirst(lc));
 		Node	   *expr;
 		char	   *argname;
 
-		Assert(IsA(r, ResTarget));
-
 		expr = transformExprRecurse(pstate, r->val);
 
 		if (r->name)
@@ -2800,8 +2793,7 @@ make_row_comparison_op(ParseState *pstate, List *opname,
 		Node	   *rarg = (Node *) lfirst(r);
 		OpExpr	   *cmp;
 
-		cmp = (OpExpr *) make_op(pstate, opname, larg, rarg, location);
-		Assert(IsA(cmp, OpExpr));
+		cmp = castNode(OpExpr, make_op(pstate, opname, larg, rarg, location));
 
 		/*
 		 * We don't use coerce_to_boolean here because we insist on the

src/backend/parser/parse_func.c

@@ -1515,8 +1515,7 @@ func_get_detail(List *funcname,
 											 &isnull);
 			Assert(!isnull);
 			str = TextDatumGetCString(proargdefaults);
-			defaults = (List *) stringToNode(str);
-			Assert(IsA(defaults, List));
+			defaults = castNode(List, stringToNode(str));
 			pfree(str);
 
 			/* Delete any unused defaults from the returned list */

src/backend/parser/parse_node.c

@@ -335,10 +335,9 @@ transformArraySubscripts(ParseState *pstate,
 	 */
 	foreach(idx, indirection)
 	{
-		A_Indices  *ai = (A_Indices *) lfirst(idx);
+		A_Indices  *ai = castNode(A_Indices, lfirst(idx));
 		Node	   *subexpr;
 
-		Assert(IsA(ai, A_Indices));
 		if (isSlice)
 		{
 			if (ai->lidx)

src/backend/parser/parse_relation.c

@@ -910,12 +910,11 @@ markRTEForSelectPriv(ParseState *pstate, RangeTblEntry *rte,
 			JoinExpr   *j;
 
 			if (rtindex > 0 && rtindex <= list_length(pstate->p_joinexprs))
-				j = (JoinExpr *) list_nth(pstate->p_joinexprs, rtindex - 1);
+				j = castNode(JoinExpr, list_nth(pstate->p_joinexprs, rtindex - 1));
 			else
 				j = NULL;
 			if (j == NULL)
 				elog(ERROR, "could not find JoinExpr for whole-row reference");
-			Assert(IsA(j, JoinExpr));
 
 			/* Note: we can't see FromExpr here */
 			if (IsA(j->larg, RangeTblRef))

src/backend/parser/parse_type.c

@@ -478,9 +478,8 @@ TypeNameListToString(List *typenames)
 	initStringInfo(&string);
 	foreach(l, typenames)
 	{
-		TypeName   *typeName = (TypeName *) lfirst(l);
+		TypeName   *typeName = castNode(TypeName, lfirst(l));
 
-		Assert(IsA(typeName, TypeName));
 		if (l != list_head(typenames))
 			appendStringInfoChar(&string, ',');
 		appendTypeNameToBuffer(typeName, &string);

src/backend/parser/parse_utilcmd.c

@@ -543,8 +543,7 @@ transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column)
 
 	foreach(clist, column->constraints)
 	{
-		constraint = lfirst(clist);
-		Assert(IsA(constraint, Constraint));
+		constraint = castNode(Constraint, lfirst(clist));
 
 		switch (constraint->contype)
 		{
@@ -1520,9 +1519,8 @@ transformIndexConstraints(CreateStmtContext *cxt)
 	 */
 	foreach(lc, cxt->ixconstraints)
 	{
-		Constraint *constraint = (Constraint *) lfirst(lc);
+		Constraint *constraint = castNode(Constraint, lfirst(lc));
 
-		Assert(IsA(constraint, Constraint));
 		Assert(constraint->contype == CONSTR_PRIMARY ||
 			   constraint->contype == CONSTR_UNIQUE ||
 			   constraint->contype == CONSTR_EXCLUSION);
@@ -1842,10 +1840,8 @@ transformIndexConstraint(Constraint *constraint, CreateStmtContext *cxt)
 			List	   *opname;
 
 			Assert(list_length(pair) == 2);
-			elem = (IndexElem *) linitial(pair);
-			Assert(IsA(elem, IndexElem));
-			opname = (List *) lsecond(pair);
-			Assert(IsA(opname, List));
+			elem = castNode(IndexElem, linitial(pair));
+			opname = castNode(List, lsecond(pair));
 
 			index->indexParams = lappend(index->indexParams, elem);
 			index->excludeOpNames = lappend(index->excludeOpNames, opname);
@@ -1872,8 +1868,7 @@ transformIndexConstraint(Constraint *constraint, CreateStmtContext *cxt)
 
 		foreach(columns, cxt->columns)
 		{
-			column = (ColumnDef *) lfirst(columns);
-			Assert(IsA(column, ColumnDef));
+			column = castNode(ColumnDef, lfirst(columns));
 			if (strcmp(column->colname, key) == 0)
 			{
 				found = true;
@@ -1902,11 +1897,10 @@ transformIndexConstraint(Constraint *constraint, CreateStmtContext *cxt)
 
 			foreach(inher, cxt->inhRelations)
 			{
-				RangeVar   *inh = (RangeVar *) lfirst(inher);
+				RangeVar   *inh = castNode(RangeVar, lfirst(inher));
 				Relation	rel;
 				int			count;
 
-				Assert(IsA(inh, RangeVar));
 				rel = heap_openrv(inh, AccessShareLock);
 				/* check user requested inheritance from valid relkind */
 				if (rel->rd_rel->relkind != RELKIND_RELATION &&
@@ -2586,9 +2580,8 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
 			case AT_AddColumn:
 			case AT_AddColumnToView:
 				{
-					ColumnDef  *def = (ColumnDef *) cmd->def;
+					ColumnDef  *def = castNode(ColumnDef, cmd->def);
 
-					Assert(IsA(def, ColumnDef));
 					transformColumnDefinition(&cxt, def);
 
 					/*
@@ -2693,9 +2686,8 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
 	 */
 	foreach(l, cxt.alist)
 	{
-		IndexStmt  *idxstmt = (IndexStmt *) lfirst(l);
+		IndexStmt  *idxstmt = castNode(IndexStmt, lfirst(l));
 
-		Assert(IsA(idxstmt, IndexStmt));
 		idxstmt = transformIndexStmt(relid, idxstmt, queryString);
 		newcmd = makeNode(AlterTableCmd);
 		newcmd->subtype = OidIsValid(idxstmt->indexOid) ? AT_AddIndexConstraint : AT_AddIndex;