Function ae_labels_src

src/execution_plan/ops/shared/print_functions.c:20–52

return the labels of the src of ae splitted by ':'

// return the labels of the src of ae splitted by ':'
static char* ae_labels_src
(
	AlgebraicExpression **ae  // AlgebraicExpression to extract labels from
) {
	sds labels = sdsempty();
	AlgebraicExpression *operand =
		(AlgebraicExpression *) AlgebraicExpression_SrcOperand(*ae);

	// as long as:
	// 1. algebraic expression isn't empty
	// 2. current operand is diagonal
	while(*ae                            &&
		  operand->type == AL_OPERAND &&
		  operand->operand.diagonal) {

		// remove source from expression
		operand = AlgebraicExpression_RemoveSource(ae);

		// update labels string
		labels = sdscatprintf(labels, ":%s", operand->operand.label);

		// free operand
		AlgebraicExpression_Free(operand);

		// advance to next source operand
		if(*ae != NULL) {
			operand =
				(AlgebraicExpression *) AlgebraicExpression_SrcOperand(*ae);
		}
	}

	return labels;
}

// return the labels of the dest of ae splitted by ':'
static char* ae_labels_dest