Function outNode

src/backend/nodes/outfuncs.c:4207–5403

* outNode - * converts a Node into ascii string and append it to 'str' */

 *	  converts a Node into ascii string and append it to 'str'
 */
void
outNode(StringInfo str, const void *obj)
{
	/* Guard against stack overflow due to overly complex expressions */
	check_stack_depth();

	if (obj == NULL)
		appendStringInfoString(str, "<>");
	else if (IsA(obj, List) || IsA(obj, IntList) || IsA(obj, OidList))
		_outList(str, obj);
	else if (IsA(obj, Integer) ||
			 IsA(obj, Float) ||
			 IsA(obj, String) ||
			 IsA(obj, BitString))
	{
		/* nodeRead does not want to see { } around these! */
		_outValue(str, obj);
	}
	else
	{
		appendStringInfoChar(str, '{');
		switch (nodeTag(obj))
		{
			case T_PlannedStmt:
				_outPlannedStmt(str, obj);
				break;
			case T_QueryDispatchDesc:
				_outQueryDispatchDesc(str, obj);
				break;
			case T_SerializedParams:
				_outSerializedParams(str, obj);
				break;
			case T_OidAssignment:
				_outOidAssignment(str, obj);
				break;
			case T_Plan:
				_outPlan(str, obj);
				break;
			case T_Result:
				_outResult(str, obj);
				break;
			case T_ProjectSet:
				_outProjectSet(str, obj);
				break;
			case T_ModifyTable:
				_outModifyTable(str, obj);
				break;
			case T_Append:
				_outAppend(str, obj);
				break;
			case T_MergeAppend:
				_outMergeAppend(str, obj);
				break;
			case T_Sequence:
				_outSequence(str, obj);
				break;
			case T_RecursiveUnion:
				_outRecursiveUnion(str, obj);