Function exprLocation

src/backend/nodes/nodeFuncs.c:1297–1681

* exprLocation - * returns the parse location of an expression tree, for error reports * * -1 is returned if the location can't be determined. * * For expressions larger than a single token, the intent here is to * return the location of the expression's leftmost token, not necessarily * the topmost Node's location field. For example, an OpExpr's location * field will point at the opera

 * known and unknown locations in a tree.
 */
int
exprLocation(const Node *expr)
{
	int			loc;

	if (expr == NULL)
		return -1;
	switch (nodeTag(expr))
	{
		case T_RangeVar:
			loc = ((const RangeVar *) expr)->location;
			break;
		case T_TableFunc:
			loc = ((const TableFunc *) expr)->location;
			break;
		case T_Var:
			loc = ((const Var *) expr)->location;
			break;
		case T_Const:
			loc = ((const Const *) expr)->location;
			break;
		case T_Param:
			loc = ((const Param *) expr)->location;
			break;
		case T_Aggref:
			/* function name should always be the first thing */
			loc = ((const Aggref *) expr)->location;
			break;
		case T_GroupingFunc:
			loc = ((const GroupingFunc *) expr)->location;
			break;
		case T_GroupId:
			loc = ((const GroupId *) expr)->location;
			break;
		case T_GroupingSetId:
			loc = ((const GroupingSetId *) expr)->location;
			break;
		case T_WindowFunc:
			/* function name should always be the first thing */
			loc = ((const WindowFunc *) expr)->location;
			break;
		case T_SubscriptingRef:
			/* just use container argument's location */
			loc = exprLocation((Node *) ((const SubscriptingRef *) expr)->refexpr);
			break;
		case T_FuncExpr:
			{
				const FuncExpr *fexpr = (const FuncExpr *) expr;

				/* consider both function name and leftmost arg */
				loc = leftmostLoc(fexpr->location,
								  exprLocation((Node *) fexpr->args));
			}
			break;
		case T_NamedArgExpr:
			{
				const NamedArgExpr *na = (const NamedArgExpr *) expr;