Function TraversalToString

src/execution_plan/ops/shared/print_functions.c:89–164

}

void TraversalToString
(
	const OpBase *op,
	sds *buf,
	const AlgebraicExpression *ae
) {
	ASSERT(op  != NULL);
	ASSERT(ae  != NULL);
	ASSERT(buf != NULL);

	*buf = sdscatprintf(*buf, "%s | ", op->name);

	// this edge should be printed right-to-left if the edge matrix is transposed
	const char *edge       = AlgebraicExpression_Edge(ae);
	const char *src_alias  = AlgebraicExpression_Src(ae);
	const char *dest_alias = AlgebraicExpression_Dest(ae);

	bool transpose  = (edge && AlgebraicExpression_Transposed(ae));
	bool same_alias = !strcmp(src_alias, dest_alias);

	AlgebraicExpression *clone = AlgebraicExpression_Clone(ae);

	//--------------------------------------------------------------------------
	// print source labels
	//--------------------------------------------------------------------------

	*buf = sdscatprintf(*buf, "(%s", src_alias);
	char *src_labels = ae_labels_src(&clone);
	*buf = sdscatprintf(*buf, "%s", src_labels);
	if(!same_alias) {
		sdsfree(src_labels);
	}

	*buf = sdscatprintf(*buf, ")");

	//--------------------------------------------------------------------------
	// print edge
	//--------------------------------------------------------------------------

	if(edge) {
		QGEdge *e = QueryGraph_GetEdgeByAlias(op->plan->query_graph, edge);
		ASSERT(e != NULL);
		if(transpose) {
			*buf = sdscatprintf(*buf, "<-");
			QGEdge_ToString(e, buf);
			*buf = sdscatprintf(*buf, "-");
		} else {
			*buf = sdscatprintf(*buf, "-");
			QGEdge_ToString(e, buf);
			*buf = sdscatprintf(*buf, "->");
		}
	} else {
		*buf = sdscatprintf(*buf, "->");
	}

	//--------------------------------------------------------------------------
	// print dest labels
	//--------------------------------------------------------------------------